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Question

Which of the following give no residue on heating ?

A
NH4NO3
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B
NH4NO2
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C
(NH4)2Cr2O7
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D
NH4Cl
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Solution

The correct option is D NH4Cl
NH4NO3(g)ΔN2O(g)+2H2O(g)NH4NO2(s)ΔN2(g)+2H2O(g)(NH4)2Cr2O7(s)ΔN2(g)+Cr2O3(s)+4H2O(g)NH4Cl(s)ΔNH3(g)+HCl(g)
Only on heating (NH4)2Cr2O7, we get residue.

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