Which balanced equation represents a redox reaction? a. agno3(aq) +nacl(aq) →agcl(s) +nano3(aq) b. h2co3(aq) →h2o() + co2(g) c. naoh(aq) + hcl(aq) →nacl(aq) + h2o() d. mg(s) + 2hcl(aq) →mgcl2(aq) + h2(g)

can you also explain why for every answer

Answer : The correct option is, (D)

Explanation :

(A)

This reaction is a double displacement reaction in which the cation and anion of two reactants are exchange their places to give two different products.

(B)

This reaction is a decomposition reaction in which the larger molecule decomposes to give two or more products.

(C)

This reaction is a neutralization reaction in which an acid and a base react to give a salt and water as a product.

(D)

This reaction is a redox reaction in which the oxidation and reduction reaction occur simultaneously.

Oxidation reaction is the reaction in which a substance looses its electrons. In this oxidation state increases.

Reduction reaction is the reaction in which a substance gains electrons. In this oxidation state decreases.

In this reaction, magnesium shows oxidation due to change in oxidation number from (0) to (+2) and hydrogen shows reduction due to change in oxidation number from (-1) to (0).

Hence, the correct option is, (D)

1.solid

2.carbon dioxide

3.helium