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 gas X.(b) Write the balanced chemical equation of the reaction.(c) Write the pH range of the aqueous solution of the gas X.
(a) On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed. Hence, it is a Decomposition Reaction.
Gas X= NO2 (Nitrogen dioxide) is released.
(b) The balanced equation is given below:
$2Cu (NO_{3})_{2}(s)\overset{heat}{\rightarrow} 2CuO(s)+4NO_{2}(g)+O_{2}(g)$
(c) pH range aqueous solution of the gas X= NO2 is between 0 to 7 i.e., acidic pH range, NO2 when dissolves in water gives Nitric acid (HNO3).
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