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Which of the following pairs of reactions produces the same gaseous product?

1. (Ca3N2 + dilute HCl) and (NH4NO2 heated strongly)
2. [(NH4)2Cr2O7 heated strongly] and (NH4NO2 heated strongly)
3. (NH4NO3 heated strongly) and [Hg(NO3)2 heated strongly]
4. (NH4Cl heated strongly) and [NaNO3 + Zn + aqueous NaOH heated]

Correct answer: [(NH4)2Cr2O7 heated strongly] and (NH4NO2 heated strongly)

Solution

Both (NH4)2Cr2O7 and NH4NO2 decompose on heating to yield N2 gas (along with water and solid Cr2O3 in the first case). No other pair in the options produces the same single gas from both reactions.

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