JAMB Chemistry 2008 Objective — Question 32

Question 32 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

Which of the following compounds of trioxonitrate (V) will decompose to give dinitrogen (I) oxide and water when heated?

A. NaNO3
B. Zn(NO3)2
C. Cu(NO3)2
D. NH4NO3Correct

Explanation

Ammonium trioxonitrate (V), NH4NO3, decomposes thermally to liberate oxygen gas, leaving behind sodiumdioxonitrate (III) as a residue: 2NaNO3 -> 2NaNO2 + O2; per the answer key, NH4NO3 -> N2O + 2H2O is the compound that decomposes to give dinitrogen (I) oxide and water.

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