9701 MCQ Solution 55

Question 55: [Inorganic> Group 2]

What are the products of the thermal decomposition of magnesium nitrate?

A magnesium nitride and oxygen

B magnesium oxide and nitrogen

C magnesium oxide, nitrogen and oxygen

D magnesium oxide, nitrogen dioxide and oxygen

Reference: Past Exam Paper -June 2003 Paper 1 Q15

Solution 55:

Answer: D.

It is written in the book. when magnesium nitrate undergoes thermal decomposition magnesium oxide solid , and nitrogen dioxide gas and oxygen gas are the products . this is the same for all group 2. the overall reaction is:

2Mg(NO3)2=2MgO +4NO2 + O2.