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


#1

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.
(i) Write a balanced chemical equation of the reaction.
(ii) Identify the brown gas X evolved.
(iii) Identify the type of reaction.
(iv) What could be the pH range of the aqueous solution of the gas X?


#2

(i)

(ii) The brown gas X is nitrogen dioxide, NO2. (1/2)
(iii) Thermal decomposition. (1/2)
(iv) pH< 7
Reason : NO2 dissolves in water to form acidic solution (pH range below 7).