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A certain compound X, when heated, produces a gas Y. The same gas Y is also produced when barium nitrate reacts with zinc in aqueous KOH solution. Identify compound X.

1. Compound X is (NH4)2Cr2O7
2. Compound X is NH4NO3
3. Compound X is KNO3
4. Compound X is NaNO3

Correct answer: Compound X is (NH4)2Cr2O7

Solution

(NH4)2Cr2O7 thermally decomposes in a spectacular 'volcano' reaction to give N2 gas, Cr2O3, and water. Reduction of nitrate by Zn in alkaline medium can also produce N2, linking Y = N2 to compound X = (NH4)2Cr2O7.

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