Question

Which of the following contains oxalic acid?

• A. Sour milk
• B. Oranges
• C. Tomatoes
• D. Tamarind

Answer 1

The correct option is C

Tomatoes

Explanation for the correct option:

As we know that;

1. Organic acids are the organic compounds which are having acidic nature
2. The most common organic acids are oxalic acid, lactic acid, tartaric acid, etc.

(C) Tomatoes

Tomatoes contain oxalic acid $\left({\mathrm{C}}_2{\mathrm{H}}_2{\mathrm{O}}_4\right)$.

Explanation for the incorrect option(s):

(A) Sour milk

Sour milk contains lactic acid $\left({\mathrm{C}}_3{\mathrm{H}}_6{\mathrm{O}}_3\right)$.

(B) Oranges

Oranges contain ascorbic acid $\left({\mathrm{C}}_6{\mathrm{H}}_8{\mathrm{O}}_6\right)$.

(D) Tamarind

Tamarind contains tartaric acid $\left({\mathrm{C}}_4{\mathrm{H}}_6{\mathrm{O}}_6\right)$.

Therefore tomatoes contain oxalic acid.

Hence, the correct option is (C).