JEE Main 2024 — Chemistry Physical Chemistry

2024mcqmedium

Given below are two statements :

Statement (I) : Aqueous solution of ammonium carbonate is basic.

Statement (II) : Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on ${K}_{a}$ and ${K}_{b}$ value of acid and the base forming it.

In the light of the above statements, choose the most appropriate answer from the options given below :

Official previous-year question

Held on 27 Jan 2024 · Verified 6 Jul 2026.

Options

A
Both Statement I and Statement II are correct
B
Statement I is correct but Statement II is incorrect
C
Both Statement I and Statement II are incorrect
D
Statement I is incorrect but Statement II is correct

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Solution

Aqueous solution of $({\mathrm{NH}}_{4}{)}_{2}{\mathrm{CO}}_{3}$ is Basic.

$\mathrm{pH}$ of salt of weak acid and weak base depends on ${K}_{a}$ and ${K}_{b}$ value of acid and the base forming it.

Solution is basic if

${K}_{b}$ (weak base) > ${K}_{a}$ (weak acid).

${K}_{a}$ ( ${\mathrm{HCO}}_{3}^{-}$ )= $4.3\times {10}^{-13}$

${K}_{b}({\mathrm{NH}}_{4}\mathrm{OH})$ = $1.8\times {10}^{-5}$

${K}_{b}$ (Ammonium hydroxide) > ${{K}_{a}}_{}$ (Hydrogen carbonate)

∴ Hence, solution of Ammonium carbonate is basic in nature.

Hence Both Statement I and Statement II are correct.

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Solution

Aqueous solution of $({\mathrm{NH}}_{4}{)}_{2}{\mathrm{CO}}_{3}$ is Basic.

$\mathrm{pH}$ of salt of weak acid and weak base depends on ${K}_{a}$ and ${K}_{b}$ value of acid and the base forming it.

Solution is basic if

${K}_{b}$ (weak base) > ${K}_{a}$ (weak acid).

${K}_{a}$ ( ${\mathrm{HCO}}_{3}^{-}$ )= $4.3\times {10}^{-13}$

${K}_{b}({\mathrm{NH}}_{4}\mathrm{OH})$ = $1.8\times {10}^{-5}$

${K}_{b}$ (Ammonium hydroxide) > ${{K}_{a}}_{}$ (Hydrogen carbonate)

∴ Hence, solution of Ammonium carbonate is basic in nature.

Hence Both Statement I and Statement II are correct.

JEE Main 2024 — Chemistry Physical Chemistry

Options

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Solution

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JEE Main Physical Chemistry in other years

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JEE Main 2024 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry