Question

Which of the following is not an oxidation or

reduction reaction ?

a) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

b) Cl2(g) + S2-

(aq) → S(s) + 2Cl-

(aq)

c) Mg(s) + Zn2+(aq) → Mg2+(aq) + Zn(s)

d) NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)​

Answer 1

Explanation:

c is the correct option

Answer 2

The correct answer is option D - NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)​.

• In the LHS of the equation we have, NaOH(aq) + HCl(aq), from which it is clear that the oxidation state of Na in LHS is +1, H in LHS is +1, O in LHS is -2, and Cl in LHS is -1.
• Again, in the RHS of the equation we have, NaCl(aq) + H2O(l)​, from which it is clear that the oxidation state of Na in RHS is +1, H in RHS is +1, O in RHS is -2, and Cl in RHS is -1.
• From the above two statements, it can be concluded that there is no change in the oxidation state of a single element in the equation. Hence, it is not an oxidation or reduction reaction as it involves a change in the oxidation state of at least one element in the chemical reaction.

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