On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed

Question: On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed. (a) Identify t

Question: On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed.

(a) Identify the type of reaction and the gas X.

(b) Write balanced chemical equation of the reaction.

(c) Write the pH range of aqueous solution of the gas X. [CBSE OD, Set 1, 2019]

Answer: (a) Decomposition reaction The gas X is nitrogen dioxide (NO)

(b) 2Cu(NO)·3HO + ∆  → 2 CuO  + 4 NO↑ + O↑ + 6HO

(c) Oxides of non-metals are acidic. Therefore aqueous solution of NO would be acidic. The pH would be less than 7 or 6.9.


Question: On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed. (a) Identify the type of reaction and the gas X. (b) Write balanced chemical equation of the reaction. (c) Write the pH range of aqueous solution of the gas X. [CBSE OD, Set 1, 2019]