WAEC Chemistry 2015 Objective — Question 19

Question 19 of 50 from the West African Examinations Council (WAEC) Chemistry 2015 Objective paper, with the correct answer and a full explanation.

Which of the following trioxonitrate (V) salts would decompose on heating to form a metal?

A. Cu(NO₃)₂
B. AgNO₃Correct
C. Pb(NO₃)₂
D. KNO₃

Explanation

AgNO₃ decomposes on strong heating to give metallic silver, NO₂ and O₂, whereas Cu(NO₃)₂ and Pb(NO₃)₂ give the metal oxide (not the metal), and KNO₃ decomposes to KNO₂ and O₂.

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