CBSE Class 10 Science 2019 Outside Delhi Set 1

Question : 6

Total: 27

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 the gas X.
(b) Write balanced chemical equation of the reaction.
(c) Write the pH range of aqueous solution of the gas X.

Solution:

(a) Decomposition reaction The gas X is nitrogen dioxide (NO2)
(b)

2‌Cu(NO3)2

Blue

⋅3H2O

∆

→

2‌CuO

Black

4NO2↑+

Brown gas

O2↑+6H2O

(c) Oxides of non-metals are acidic. Therefore aqueous solution of this gas would be acidic. The pH would be less than 7 or 6.9

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