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:
(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identity the type of reaction.
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Answer:
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).
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