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Q.

A solution of colourless salt Hon boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after some time. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt (s) H is (are) :

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a

NH4Cl

b

NH4NO2

c

NH42SO4

d

NH4NO3

answer is B, D.

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Detailed Solution

NH4+ salts liberate NH3 with NaOH.

NH4NO3 liberatesN2O (flammable gas).

NH4NO2 and NH42SO4 are  colourless salts.

Thus, options B and D are correct

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