Question

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and 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 aqueous solution of the gas X?

Answer 1

i. Balanced equation of the reaction:

ii. Nitrogen dioxide is the brown gas ‘X’ evolved in the given reaction.
iii. The given reaction is thermal decomposition reaction.
iv. Aqueous solution of nitrogen dioxide (i.e., gas ‘X’ in the given reaction) will have the pH range between 0 to 7 i.e., acidic pH range. This is because, oxides of non-metals are generally acidic in nature.