Question

On heating blue coloured powder of copper(II) nitrate in a boiling tube copper oxide (black), oxygen gas and a brown gas X is formed. Which type of reaction is this?

• A. Displacement reaction
• B. Precipitation reaction
• C. Decomposition reaction
• D. All of the above

Answer 1

Answer: (C)

Decomposition reaction

On heating, blue coloured copper(ll) nitrate decomposes to form new products as copper oxide, oxygen gas and nitrogen dioxide gas. The equation for this reaction can be written as:

$2Cu\left(N{O}_3{)}_2\right(s\left)\stackrel{heat}{⟶}2CuO\right(s)+O_2(g)+4N{O}_2(g)$
(blue) (black) (brown)

Hence the correct option is C.