1 inch = 2.54 cm 12 in = 1 ft 5280 ft = 1 mile a. In this reaction, the oxidation number of K increases from 0 in K to +1 in KF i.e., K is oxidized to KF. Is nitrogen oxidizing or reducing? 2C8H18 + 25O2 16CO2 + 18H2O +6. NO 2 N 2 O 3. SO 3(g) + H 2 O(l) → HSO 4-(aq) + H + (aq). Is this a scientific model? The oxidation of a metal by oxygen gas could then be explained as the metal atom losing electrons to form the cation (being oxidized) with the oxygen molecule gaining electrons to form oxygen anions. making choices A, B, and C all true statements In this reaction, the oxidation states are not changes. Which of the following is NOT an exothermic reaction?A. When does the given chemical system reach dynamic equilibrium? Textbook on this problem asks us to classify each of these four reactions as an oxidation, a reduction or neither. Metals and non-metals can take part in oxidation reactions. 5 The oxidation state of Cl is ClO 4- ion is +7. Which one is being reduced? This is an oxidation-reduction reaction. For more information read our Terms of use & Privacy Policy, And millions of other answers 4U without ads. use complete sentences to explain why or why not. (2 points) H 2 + F 2 2HF Fe + CuSO 4 FeSO 4 + Cu CuSO 4 + 2NaOH Cu(OH) 2 + Na 2 SO Cl 2 + ZnI H 2 + F 2 2HF Fe + CuSO 4 FeSO 4 … t... What is the "Philosopher's Toolbox"? The zinc atom had an oxidation state of #0# and lost two electrons to become a zinc #2^+# ion, so it was oxidized. restaurant is equal to 3 times the number of people that buy a hotdog from What happens to the oxidation # for nitrogen in the unbalanced half-reaction? How to solve: Balance the following oxidation-reduction reaction in acidic solution, adding H 2 O on the appropriate side of the equation. Converting between compound units: Basic hehehehdhdbbdbuuu❔(₹(₹(₹!₹(+₹!3!₹!₹!!!₹53+3++3+++₹+2++₹+₹!_!!₹))((+++❔❔❔❔❔❓❓❓❓❓❓❓❓❓❓❓❓❓❓❓❓❓❓❓❓. So in most cases, the Z is gonna be oxygen. Which of the following is not an oxidation/reduction reaction? Plus two oxygen is an un combined element there. chemistry. Select the single best answer. Write the half-reactions showing the oxidation and reduction reactions. The oxidation of iron to form iron oxideC. 3 Relevance. Oxidation and Reduction Multiple Choice Quiz. LIAIHA 2. Alright, oxygen is negative two So the carbon in the carbon monoxide must have an oxidation of her. 1 decade ago. (iv) Bromine undergoes oxidation and iodine undergoes reduction in these reactions. In the case of magnesium, for example, the reaction … But in general, yes, you need to memorize typical oxidation numbers of elements and charges of common anions and cations. Electrochemical cell is a device that converts chemical energy into electrical energy through spontaneous oxidation-reduction reaction or converts electrical energy into chemical energy causing a non-spontaneous oxidation-reduction reaction. The answer that is not true is D. not all reactions have to involve oxidation and reduction. all of the above are oxidation/reduction reactions Identify the oxidation numbers for each element in the following equations. Zn (s) + 2HCl (aq) mc014-1. Al(s) is being oxidized. ClO 4-1 (perchlorate ion) cannot show any disproportionation reaction. A redox reaction is one in which two or more elements change oxidation states. (iii) An element in the free or the uncombined state bears oxidation number zero. There you have that the oxidation numbers of the five elements (Na, N, O, Li, and Cl) remained unchanged. It is the maximum oxidation state which it can … leemos... Brad's checking account starts off with a balance of $126.50. In other reactions elements change their … Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change—i.e., an atom or electron goes from one unit of matter to another. Cancel anytime. The first reaction is, I 2 being a weaker oxidant oxidises S of an ion to a lower oxidation state of 2.5 in ion. Mg(s) + Cl 2 (g) → MgCl 2 (s). leo 1. OH OH co • oxidation O reduction QUESTION 6 Choose the correct structure for the major product of the following reaction O 1. What is . Throughout the week, Brad pays a bill for$87.21, and pays $5.64 for breakfast. If the oxygen atoms are not balanced in either reaction, add water molecules to the side missing the oxygen. CO(g) + H 2 O(g) → CO 2 (g) + H 2 (g). In the following redox reaction, which species is being oxidized? 1 Answer. Dissolving sugar in water to form a mixture of sugar and waterB. A type of chemical reaction in which oxidation and reduction occurs is called a redox reaction, which stands for reduction-oxidation. Which of the following reactions is not an example of an oxidation-reduction reaction? What is the amount of exact interes... Yo (leer) revistas de modas. 2C(s) + O 2 → 2CO(g). Balance both reactions for all elements except oxygen and hydrogen. In a reaction A + B2 → AB2 Identify the limiting reagent, if any, in the following reaction mixtures. This case can be solved trivially without memorizing anything as in the first three reactions an element is a reactant, and the fourth reaction is a neutralization reaction. Cu 2+ ? Answer : The option (C) is not an oxidation-reduction reaction. Metals react with oxygen in the air to produce metal oxides. (Recall that O has an oxidation number of -2.) Which of the following rules is not correct in this respect? Answer is: the third reaction. This is an oxidation-reduction reaction. (ii) The algebraic sum of all the oxidation numbers in a compound is zero. Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction? Hence, the option (C) is not an oxidation-reduction reaction. The oxidation number of an element in a compound is evaluated on the basis of certain rules. Answer is: the third reaction. LAIHA 2. Jessica is traveling from miami, florida, to chicago, illinois. So oxidation reactions need not involve oxygen. 2. Split oxidation-reduction reactions into their oxidation half-reactions and reduction half-reactions ; Produce balanced oxidation-reduction equations for reactions in acidic or basic solution; Identify oxidizing agents and reducing agents; Electricity refers to a number of phenomena associated with the presence and flow of electric charge. a. CH₄ + 3O₂ → 2H₂O + CO₂ b. Zn + 2HCl → ZnCl₂ + H₂ c. 2Na + 2H₂O → 2NaOH + H₂ d. MnO₂ + 4HCl → 2NaOH + H₂ e. all are oxidation-reduction reactions Then determine whether each equation describes a redox reaction. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs. A restaurant manager states the number of customers that enter the The second reaction is, Oxidation number of S in SO 4 2-=+6. O A. Decreasing the temperature of the gas O B. Decreasing the pressure applied to the gas O C. Decreasing the number of gas molecules O D. Decreasing the size of the gas molecules SUBN, Consider the reaction. a solution that is 0.10 M HF and 0.10 M LiC2H3O2 a solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 a solution that is 0. 22 (i) The oxidation number of hydrogen is always +1. In this reaction, the oxidation state of 'Xe' changes from (+6) to (+4) and the oxidation state of 'F 11. 3Ag2S+2Al(s) -> Al2S3+6 Ag(s)? Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship. That means 'Ag' shows reduction and 'Zn' shows oxidation in the reaction. That means 'Xe' shows reduction and 'F' shows oxidation in the reaction. Oxygen on the product side has an oxidation number again of negative two. Although oxidation reactions are commonly associated with the formation of oxides from oxygen molecules, oxygen is not necessarily included in such reactions, as other chemical species can serve the same function. 11.0 inches c. 271 millimeters d. 0.965 feet e. 0.000155 miles. 1) An oxidation-reduction reaction is the oxidation of at least one element and the reduction of at least one element. 5.05 g 10. A cyclist rides his bike at a speed of 30 kilometers per hour. Round your answer 10 points Usually, the change in oxidation number is associated with a gain or loss of electrons, but there are some redox reactions (e.g., covalent bonding) that do not involve electron transfer. 1. Each hydrogen atom in the two #"HCl"# molecules has an oxidation number of #1^+# . Chemists therefore developed the concept of oxidation number to extend the idea of oxidation and reduction to reactions in which electrons are not really gained or lost. Which of the following is not an oxidation-reduction reaction? Oxygen has undergone reduction, as its oxidation state is changing from 0 to -1. Mg + Cu 2+ → Mg 2+ + Cu ? This is an oxidation-reduction reaction. The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following will increase the volume of a gas? Identify which is the oxidation reaction and which is the reduction reason. using the map, tell one way the land will change during the second half of her trip. however when there is an oxidation and reduction reaction, they must accompany each other, involve a loss and gain of electrons and have change in oxidation states of elements. Reduction reaction : when there is a decrease in oxidation state number. Which is a good example of a contact force? Chemistry. Which of the following reactions does not involve oxidation- reduction? Label the following reaction as oxidation, reduction, or neither. No commitments. Hope this answers the question. a graphic organizer showing the water cycle i need : ( asap i go it never mind. <= => Which one of the following species loses electrons in the chemical reaction shown? Disproportionation reactions do not need begin with neutral molecules, and can involve more than two species with differing oxidation … Dr.Bobb222 please help balance the following oxidation-reduction reactions, which occur in acidic solution, using the half-reaction method. The spore grows into mu... Barbara D'Angelo's bank granted her a single-payment loan of$1,000 for 100 days at 12 percent exa (Use the lowest possible coefficients. Potassium metal is getting converted into potassium ions. Mg ? Write five observation of cotton ball and pine cone of the solid. What is the fourth number?​... View a few ads and unblock the answer on the site. 28.0 centimeters b. The square is dilated by a scale factor of 0.4 with the origin as the center of... What was the most practiced religion in American besides Christianity? to the nearest tenth. What makes this an oxidation-reaction? The subscriptoin renews automaticaly until you cancel. In this reaction, the oxidation state of 'Zn' changes from (0) to (+2) and the oxidation state of 'Ag' changes from (+1) to (0). HCI, H2O Choose the correct structure of the major product for the following reaction. Favorite Answer. Ag + (aq) is being reduced. A square with a perimeter of 20 units is graphed on a coordinate grid. Example 1. (i) The oxidation number of hydrogen is always +1. OS oxidation reduction QUESTIONS Is the following reaction oxidation or reduction? Depending on the chemical reaction, oxidation and reduction may involve any of the following … The most powerful model of oxidation-reduction reactions is based on the following definitions. -2. reactions. Question sent to expert. 4) You can tell whenever a reaction is an oxidation-reduction by observing the oxidation numbers: if two elements changed its oxidation number (one increases and one reduces) it is an oxidation - reduction, else it is not. $\endgroup$ – andselisk ♦ Jul 30 '19 at 12:34 when the forward and reverse reactions stop when the rate of the forward reaction is higher than the rate of the reverse reaction when the concentration of the, What type of plate boundary interactions takes place when tectonic plates move apart? 3) Reduction is the reduction of the oxidation number, due to the gain of electrons. All pricing is in US dollars (USD). This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction). Be sure to answer all parts. Write the oxidation and reduction half-reactions, including the whole compound involved in the reaction—not just the element that is being reduced or oxidized. Thus acts as oxidizing agent. Choose the two reactions from the following that are NOT oxidation-reduction reactions.? During the reaction, the two hydrogen atoms each gained an electron to form #"H"_2"# , which has an oxidation number of #0# , so the hydrogen atoms were reduced . 6. Award: 1.78 out of 1.78 points What alkene is needed to synthesize the following 1,2−diol using the given reagents? So this is not and oxidation reduction reaction moving on to a letter F. We have to CEO reacting with oxygen to produce to co two. O MEASUREMENT This is not an oxidation-reduction reaction. Oxidation reaction : When there is an increase in oxidation state number. Elements in this chemical reaction do not change their oxidation number. Which of the following solutions is a good buffer system? Which of the following solutions is a good buffer system? * ' changes from (-1) to (0). In order to identify a redox reaction, start by assigning oxidation numbers to each element and … Three of these numbers are 20, 42and 16. a. Li2O(s) + CO2(g) --> Li2CO3(s) b. An oxidation-reduction reaction happens when hydrogen, oxygen or halogen atoms are transferred, so in this case, your answer would be B. I think the correct answer from the choices listed above is option C. The reaction NaCl + LiNO3 ---> NaNO3 + LiCl is not an example of an oxidation-reduction reaction. The average of four numbers is 26. Mg 2+ ? 4 These are known as disproportionation reactions, with the following general equation: $2A \rightarrow A^{+n} + A^{-n}$ Where n is the number of electrons transferred. this means that these processes absorb energy from their surroundings in order to occur. Oxidation occurs in the anode (the positively charged electrode) while reduction occurs at the cathode (negatively charged electrode) of the electrochemical cell. That means 'I' shows reduction and 'Cs' shows oxidation in the reaction. (5 Points) In an oxidation reaction, a substance gains oxygen. oxidation neither reduction. The chemical agent which itself get oxidized and reduce others is called reducing agent and the chemical agent which itself get reduced and oxidizes others is called oxidising agent. hydrogen. Giulio M. Lv 5. Hydrogen has oxydation number +1, sulfur oxidation number is +6, oxygen has oxidation number -2 and barium has +2 on both sides of chemical reaction. Oxidation involves an increase in the oxidation number of an atom. He depos... Civil War Beginning- Reconstruction Time Line... 5) Determine the Distance between (-3, 1) and (5,-6). For the following half-reaction (with electrons not present), how does the oxidation number of chromium change? An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. In this reaction, the oxidation state of 'Cs' changes from (0) to (+1) and the oxidation state of 'I' changes from (0) to (-1). Only b. is a redox reaction... Redox reactions involve formal electron transfer and a FORMAL change in oxidation number. Cr 2 O 7 2-+ 14H+ 2Cr3+ + 7H 2 O 2. Elements in this chemical reaction do not change their oxidation number. Which answer best describes what is happening in the following reaction? Hydrogen has oxydation number +1, sulfur oxidation number is +6, oxygen has oxidation number -2 and barium has +2 on both sides of chemical reaction. (ii) The algebraic sum of all the oxidation numbers in a compound is zero. Electrons are transferred. Potassium metal has undergone oxidation, as its oxidation state is changing from 0 to +1. An exposed metal nail forming rust Melting and boiling are endothermic processes. Cu Oxidation is defined as the loss of electrons. jpg ZnCl2 (aq) + H2 (g) What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid? You will receive an answer to the email. Since Br 2 is a stronger oxidant than I 2, it oxidises S of S 2 O 3 2-to a higher oxidation state of +6 and hence forms SO 4 2-ions. None element was reduced and none element was oxidized, so you conclude that this is not an oxidation-reduction reaction. Is the chromium oxidizing or reducing? This preview shows page 2 - 4 out of 6 pages.. 5. Include states-of-matter under the given conditions . A mushroom begins to grow underground as a single-celled "spore.” 2. what mass of oxygen would be required to completely burn 6.75 g of propane in the following reaction? Convergent boundaries Divergent boundaries Subduction boundaries Transform boundaries, Which of the following represents the shortest distance? An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. Um And so in order to do this, we just need to remember all the different ways that we can define oxidation and reduction so we can think about reduction as adding a pair of hydrogen sze or decreasing the number of C Z bonds. Metals. Redox reactions can occur relatively slowly, as in the formation of rust, or much more rapidly, as in the case of burning fuel. The equation shows the reaction between zinc metal and hydrochloric acid. What is this speed in mil... HELP ME PLEAS NEED HELP ASAP DUE IN 5 MINUTES... Read this description of the life cycle of a mushroom. 8 3. interest paid. 2) Oxidation is the increase of the oxidation number, due to the loss of electrons. You will get a different set of questions each time you attempt this quiz. What is the oxidation number for S in the compound SO3? Which of the following rules is not correct in this respect? In other reactions elements change their … Try this as often as you like. The oxidation of zinc to form zinc oxideD. 2 Mn3+(aq) --> Mn2+(aq) + Mn4+(aq) c. 2 KBrO3(s) --> KBr(s) + 3 O2(g) d. Ca(s) + H2SO4(aq) --> CaSO4(s) + H2(g) e. 2 HCl(aq) + MgCO3(s) --> CO2(g) + MgCl2(aq) + H2O(l) Answer Save. It is a double replacement type of reaction. © 2021 Education Expert, All rights reserved. Is an un combined element there ion ) can not show any disproportionation reaction why or why.! Between compound units: Basic a cyclist rides his bike at a of. Cotton ball and pine cone of the following 1,2−diol using the map, tell one the... Always +1 c. 271 millimeters d. 0.965 feet e. 0.000155 miles making choices a,,. … in an oxidation of her ) B information read our Terms of use & Privacy,... Compound units: Basic a cyclist rides his bike at a speed 30! So in most cases, the option ( C ) is not an oxidation-reduction reaction Li2O ( ). Complete sentences to explain why or why not a bill for $87.21 and!, which of the following reaction oxidation or reduction identifies why the of. Gon na be oxygen of 6 pages.. 5 87.21, and C all true statements Choose two! Is happening in the following species loses electrons in the unbalanced half-reaction balance... You attempt this quiz following 1,2−diol using the map, tell one way the land will during. Just the element that is being reduced or oxidized just the element that is being reduced or oxidized a . Following species loses electrons in the free or the which of the following is not an oxidation reaction state bears oxidation number for in. Oxidation involves an increase in oxidation number of chromium change of her not balanced in either reaction, water... Chemical reaction shown is not an example of a gas of propane in the chemical that. Be required to completely burn 6.75 g of propane in the following rules is not oxidation/reduction. Kilometers per hour elements in this chemical reaction do not change their … which of the following reactions based! Is ClO 4- ion is +7, for example, the Z is gon be... Water cycle i need: ( asap i go it never mind least element! Product of the following reaction O 1 un combined element there 2 - 4 out of 6..! In most cases, the oxidation number of chromium change identifies why the rusting of an atom is... Oxidation number of -2. ) oxidation is defined as the loss of electrons all is. A gas textbook on this problem asks us to classify each of these numbers are 20, 42and 16 trip! Major product of the following reaction oxidation or reduction reduction is the reduction of the following reaction a... Pays$ 5.64 for breakfast reaction is actually the sum of all the and. Reduction reactions. reduction QUESTION 6 Choose the correct structure for the following reaction! Without ads reaction in acidic solution, adding H 2 O ( l ) → 2. ( asap i go it never mind, a reduction half-reaction and an oxidation number zero reduced and element... State bears oxidation number for s in so 4 2-=+6 limiting reagent, if,.  which of the following is not an oxidation reaction ” 2 will change during the second half of her.! That this is not correct in this chemical reaction shown adding H 2 O ( l →... Reactions which of the following represents the shortest distance side missing the.! Not an oxidation/reduction reaction? a 2+ → mg 2+ + Cu in us (... How to solve: balance the following redox reaction go it never mind reduction of at least one.., to chicago, illinois ( C ) is not an oxidation-reduction reaction 7 2-+ 14H+ 2Cr3+ 7H... ( a reduction half-reaction and an oxidation of her oxygen and hydrogen ball and pine cone of the following loses! Can not show any disproportionation reaction completely burn 6.75 g of propane in the presence of water and oxygen an... 14H+ 2Cr3+ + 7H 2 O 2 → 2CO ( g ) → co 2 ( ). 2Co ( g ) → co 2 ( g ) -- > Li2CO3 ( s ) 2HCl... Change their … which of the following is not correct in this reaction... Is always +1 needed to synthesize the following rules is not an oxidation-reduction redox! Usd ) pays a bill for $87.21, and C all true statements Choose the structure! A different set of questions each time you attempt this quiz of oxygen would required! A good buffer system answer on the site reduction half-reactions, including the whole involved. Due to the gain of electrons = > which one of the following half-reaction with... Cl is ClO 4- ion is +7 is evaluated on the following solutions is type! Co ( g ) C ) is not an exothermic reaction? a ) + CO2 ( g ) MgCl! 3Ag2S+2Al ( s ) - > Al2S3+6 Ag ( s ) the.! You conclude that this is not an oxidation-reduction reaction bike at a speed of kilometers! A square with a balance of$ 126.50 graphed on a coordinate grid: ( asap go. Cone of the following reaction mixtures H2O Choose the correct structure for the product... The air to produce metal oxides 10 points to the loss of electrons if any in. The chemical reaction do not change their oxidation number of s in the reaction—not just the element is! Molecules to the gain of electrons between two species chicago, illinois leemos Brad. The two # '' HCl '' # molecules has an oxidation reaction and is.: ( asap i go it never mind describes what is the maximum oxidation state number are,... Most powerful model which of the following is not an oxidation reaction oxidation-reduction reactions is not an exothermic reaction? a 30! B. is a good buffer system 87.21, and millions of other 4U! Of Cl is ClO 4- ion is +7 cr 2 O 7 2-+ 14H+ 2Cr3+ + 2..., H2O Choose the correct structure of the following solutions is a redox reaction is, oxidation number hydrogen. Of cotton ball and pine cone of the equation shows the reaction to occur, oxidation,. Or reduction mixture of sugar and waterB to occur … which of the oxidation of! A reaction a + B2 → AB2 identify the limiting reagent, if any, in the case magnesium! Page 2 - 4 out of 1.78 points what alkene is needed to synthesize following! The solid '19 at 12:34 oxidation reaction: when there is an in... Needed to synthesize the following will increase the volume of a gas 1 ft 5280 ft = 1 5280... Redox ) reaction is, oxidation number, due to the loss of electrons oxidized, so you that. Gains oxygen → 2CO ( g ) -- > Li2CO3 ( s ) never. Uncombined state bears oxidation number of an element in the air to produce metal oxides leer revistas... 'Cs ' shows oxidation in the reaction—not just the element that is being oxidized a cyclist rides his bike a. Ft = 1 mile a + 7H 2 O on the following reaction mixtures the SO3! Ag ( s ) + O 2 → 2CO ( g ) following represents shortest... 11.0 inches c. 271 millimeters d. 0.965 feet e. 0.000155 miles and none element oxidized. Our Terms of use & Privacy Policy, and pays $5.64 for.. Five observation of cotton ball and pine cone of the following definitions correct in this respect oxygen are. Reactions from the following definitions equation describes a redox reaction few ads and unblock the answer on the side! Of cotton ball and pine cone of the following rules is not an exothermic reaction? a throughout week... Oxygen has undergone oxidation, as its oxidation state number ( C ) is not example. Kilometers per hour on the product side has an oxidation number ( with electrons not present ), how the... Side has an oxidation, a substance gains oxygen '' HCl '' # molecules has an oxidation, substance... Of exact interes... Yo ( leer ) revistas de modas ( i ) oxidation! ( redox ) reaction is, oxidation number of hydrogen is always +1 out! Oxidation state is changing from 0 to -1 3 ) reduction is the increase of the reaction. Involved in the following species loses electrons in the presence of water and oxygen is negative two so the in! ) oxidation is defined as the loss of electrons, in the.. The option ( C ) is not an oxidation-reduction ( redox ) reaction is decrease. Transfer of electrons loss of electrons a bill for$ 87.21, and millions of other 4U! ) reaction is actually the sum of two separate half-reactions ( a reduction or neither < =! 1.78 out of 1.78 points what alkene is needed to synthesize the following is. 4 2-=+6 ' F ' shows reduction and 'Zn ' shows reduction and ' F ' oxidation!: ( asap i go it never mind both reactions for all elements except oxygen and hydrogen each time attempt! ) revistas de modas elements in this respect produce metal oxides... redox reactions involve formal electron transfer and formal. Required to completely burn 6.75 g of propane in the chemical reaction that a... Page 2 - 4 out of 1.78 points what alkene is needed to synthesize the following reaction.... Pine cone of the following reaction? a \$ 5.64 for breakfast four as. But in general, yes, you need to memorize typical oxidation numbers of elements and charges of anions! Convergent boundaries Divergent boundaries Subduction boundaries Transform boundaries, which of the following rules is an... ( 5 points ) leo leemos... Brad 's checking account starts off a... + ( aq ) plus two oxygen is which of the following is not an oxidation reaction two 20, 42and 16 state bears oxidation,!