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Question

Identify (C) :

A
N2
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B
H2
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C
O2
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D
N2O
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Solution

The correct option is A N2
A colorless water soluble crystalline solid (A) on heating gives O2 and gives a water soluble crystalline solid (B).
2KNO3(s)2KNO2(s)+O2(g)
So, A is KNO3(crystalline solid) and B is KNO2(water soluble crystalline solid). Both A and B impart violet coloration to the Bunsen flame.
When B is heated with NH4Cl, inactive gas (C) is obtained but when A is heated with NH4Cl, a gas (D) which supports combustion is formed.
NH4Cl+KNO2N2+KCl+2H2O
So the gas C is N2.
Hence option B is correct.

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