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ICSE Class 10 Chemistry Question 14 of 69

Study of Compounds — Ammonia — Question 5

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Question 5

A gas 'A' reacts with another gas 'B' in the presence of a catalyst to give a colourless gas 'C'. The gas 'C' when comes in contact with air produces a brown gas 'D'. The solution of 'A' in water turns red litmus blue. Explain the observations.

Answer

As the 'A' turns red litmus blue it is a base. Now the gas 'A' combines with 'B' in presence of Catalyst to give colourless gas Nitrogen monoxide. It reacts with oxygen to give brown gas which is Nitrogen dioxide. The gases are given as :

A = NH3
B = O2
C = NO
D = NO2

4NH3 + 5O2 →800°CPt.\xrightarrow[800 \degree \text{C}]{\text{Pt.}} 4NO↑ + 6H2O + Δ

2NO + O2 ⟶ 2NO2 [brown gas]