Question

The product formed during a direct combination reaction of carbon dioxide and water is

• A. Iron
• B. Carbonic acid
• C. Hydrogen
• D. Oxygen
• E. Carbon monoxide

Answer 1

The correct option is B

Carbonic acid

The explanation for the correct answer

(B) Carbonic acid

When carbon dioxide reacts with water, it forms carbonic acid as a product.

$\underset{\mathrm{Dioxide}}{\underset{\mathrm{Carbon}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Acid}}{\underset{\mathrm{Carbonic}}{{\mathrm{H}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)}}$

The explanation for the incorrect answer

(A) Iron

Iron will not be formed as a product because there is no iron in the reactant.

(C) Hydrogen

${\mathrm{CO}}_2$ dissolves in water, and some of it reacts with water molecules to produce a slightly acid solution called carbonic acid. Therefore, hydrogen will not be formed as the product.

(D) Oxygen

Oxygen will not be formed as the product

(E) Carbon monoxide

Carbon monoxide will not be formed.

So, the correct answer is an option (B)