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Pure nitrogen is prepared in the laboratory by heating a mixture of

1. NH4OH + NaCl
2. NH4NO3 + NaCl
3. NH4Cl + NaOH
4. NH4Cl + NaNO2

Correct answer: NH4Cl + NaNO2

Solution

Pure nitrogen is prepared in the laboratory by heating a mixture of ammonium chloride (NH4Cl) and sodium nitrite (NaNO2), which react to produce nitrogen gas, water, and sodium chloride.

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