A solution of colourless salt H on boiling with excess NaOH produces a nonflammable gas. The gas evolution ceases after sometime upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is (are):

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NH₄NO₃

NH₄Cl

NH₄NO₂

(NH₄)₂SO₄

answer is A, B.

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Detailed Solution

$\underset{[H]}{{NH}_{4} {NO}_{3}} + NaOH ⟶ \underset{non flammable gas}{{NH}_{3}} + {NaNO}_{3} + H_{2} O {NaNO}_{3} + 4 Zn + 7 NaOH \to 4 {Na}_{2} {ZnO}_{2} + {NH}_{3} + 2 H_{2} O \underset{[H]}{{NH}_{4} {NO}_{2}} + NaOH \to {NH}_{3} + {NaNO}_{2} + H_{2} O 3 Zn + 5 NaOH + {NaNO}_{2} \to 3 {Na}_{2} {ZnO}_{2} + {NH}_{3} + H_{2} O$

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