How many of the following compound on thermal decomposition gives $N_{2}$ gas?
$(N H_{4})_{2} C r_{2} O_{7}$ , $N H_{4} N O_{3}$ , $N H_{4} I O_{3}$ , $N H_{4} N O_{2}$ , $B a (N_{3})_{2}$ , $B a (N O_{3})_{2}$ , $(N H_{4})_{2} S O_{4}$ , $(N H_{4})_{2} C O_{3}$

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Solution

The correct option is B 3
$(N H_{4})_{2} C r_{2} O_{7} ⟶ N_{2} + C r_{2} O_{3} + H_{2} O$
$N H_{4} N O_{3} ⟶ N_{2} O + 2 H_{2} O$
$N H_{4} I O_{3} ⟶$
$N H_{4} N O_{2} ⟶ N_{2} + 2 H_{2} O$
$B a (N_{3})_{2} ⟶ B a + 3 N_{2}$
$B a (N O_{3})_{2} ⟶ B a O + N O_{2} + O_{2}$
$(N H_{4})_{2} S O_{4} ⟶ N H_{4} H S O_{4} + N H_{3}$
$(N H_{4})_{2} C O_{3} ⟶ 2 N H_{3} + C O_{2} + H_{2} O$
$∴$ Answer is option B=3

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