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Question

Identify (P),(Q) and (R).
(P)KOH−−−→(Q)+(R)Zn+KOH−−−−−−→(Q)gas(gasturnsred litmusred)
(P)Δ−→ Gas (does not support combustion)

A
P=(NH4)2SO4, Q=NH3, R=K2SO4
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B
P=(NH4)2NO3, Q=NH3, R=KNO3
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C
P=(NH4)2NO2, Q=NH3, R=KNO2
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D
P=(NH4)2Cr2O7, Q=NH3, R=Cr2O3
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Solution

The correct option is C P=(NH4)2NO2, Q=NH3, R=KNO2
P=(NH4)2NO2, Q=NH3, R=KNO2
Reactions are as follows:
(NH4)2NO2(P)KOH−−NH3(Q)+KNO2(R)Zn+KOH−−−−−NH3(Q)gas(gasturnsredlitmusred)
(NH4)2NO2(P)Δ Gas (does not support combustion)

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