JEE Main 2020 — Chemistry Inorganic Chemistry

2020mcqmedium

On heating compound $(A)$ gives a gas $(B)$ which is constituent of air. This gas when treated with ${H}_{2}$ in the presence of a catalyst gives another gas $(C)$ which is basic in nature. $(A)$ should not be :

Official previous-year question

Held on 2 Sept 2020 · Verified 6 Jul 2026.

Options

A
${\mathrm{NaN}}_{3}$
B
$\mathrm{Pb}{({\mathrm{NO}}_{3})}_{2}$
C
${({\mathrm{NH}}_{4})}_{2}{\mathrm{Cr}}_{2}{O}_{7}$
D
${\mathrm{NH}}_{4}{\mathrm{NO}}_{2}$

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Solution

$\mathrm{Pb}{({\mathrm{NO}}_{3})}_{2}\overset{\Delta }{\longrightarrow }\mathrm{PbO}+2{\mathrm{NO}}_{2}$

${N}_{2}$ gas is constituent of air and it produces ammonia gas (basic nature) after reacting with ${H}_{2}$ gas.

${\mathrm{NH}}_{4}{\mathrm{NO}}_{2},({\mathrm{NH}}_{4}{)}_{2}{\mathrm{Cr}}_{2}{O}_{7}\mathrm{and}{\mathrm{NaN}}_{3}$ give nitrogen gas on heating but lead nitrate doesn't give nitrogen gas so it will be answer.

${\mathrm{NH}}_{4}{\mathrm{NO}}_{2}\overset{\Delta }{\longrightarrow }{N}_{2}+2{H}_{2}O$

${({\mathrm{NH}}_{4})}_{2}{\mathrm{Cr}}_{2}{O}_{7}\overset{\Delta }{\longrightarrow }{N}_{2}+{\mathrm{Cr}}_{2}{O}_{3}+{H}_{2}O$

${\mathrm{NaN}}_{3}\overset{300^{\circ}C}{\longrightarrow }3{N}_{2}+2\mathrm{Na}$

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Solution

$\mathrm{Pb}{({\mathrm{NO}}_{3})}_{2}\overset{\Delta }{\longrightarrow }\mathrm{PbO}+2{\mathrm{NO}}_{2}$

${N}_{2}$ gas is constituent of air and it produces ammonia gas (basic nature) after reacting with ${H}_{2}$ gas.

${\mathrm{NH}}_{4}{\mathrm{NO}}_{2}\overset{\Delta }{\longrightarrow }{N}_{2}+2{H}_{2}O$

${({\mathrm{NH}}_{4})}_{2}{\mathrm{Cr}}_{2}{O}_{7}\overset{\Delta }{\longrightarrow }{N}_{2}+{\mathrm{Cr}}_{2}{O}_{3}+{H}_{2}O$

${\mathrm{NaN}}_{3}\overset{300^{\circ}C}{\longrightarrow }3{N}_{2}+2\mathrm{Na}$

JEE Main 2020 — Chemistry Inorganic Chemistry

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JEE Main Inorganic Chemistry in other years

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JEE Main 2020 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry