Q25 / 90 · JEE Main 2018 (08 Apr) · Chemistry

The compound that does not produce nitrogen gas by thermal decomposition is:

Correct answer
A
${(N H_{4})}_{2} S O_{4}$
B
$B a {(N_{3})}_{2}$
C
${(N H_{4})}_{2} C r_{2} O_{7}$
D
$N H_{4} N O_{2}$

Solution

(i)

{(N H_{4})}_{2} C r_{2} O_{7} \overset{Δ}{\to} C r_{2} O_{3} + N_{2} + 4 H_{2} O

(ii)

N H_{4} N O_{2} \overset{Δ}{\to} N_{2} + 2 H_{2} O

(iii)

{(N H_{4})}_{2} S O_{4} \overset{Δ}{\to} 2 N H_{3} + H_{2} S O_{4}

(iv)

B a {(N_{3})}_{2} \overset{Δ}{\to} B a + 3 N_{2}

In reaction (iii)

N H_{3}

is evolved whereas in reaction 1, 2 and 4

N_{2}

is evolved.

Hence, the correct answer is option: 'A'.

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