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On heating blue coloured powder of coppe...

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) Identify the brown gas X evolved.
(c) Identify the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X ?

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