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+1 vote
70.4k views
in Chemistry by (130k points)
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On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and brown gas (X) is formed.
i. Write a balanced chemical equation of the reaction.
ii. Identify the brown gas X evolved.
iii. Identify the type of reaction.
iv. What could be the pH range of aqueous solution of the gas X?

2 Answers

+4 votes
by (93.7k points)
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Best answer

i. Balanced equation of the reaction:

ii. Nitrogen dioxide is the brown gas ‘X’ evolved in the given reaction.
iii. The given reaction is thermal decomposition reaction.
iv.
Aqueous solution of nitrogen dioxide (i.e., gas ‘X’ in the given reaction) will have the pH range between 0 to 7 i.e., acidic pH range. This is because, oxides of non-metals are generally acidic in nature.

+4 votes
by (49.2k points)
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(a) 2Cu(NO3)2 → 2CuO+ 4NO2+O2
(b) The brown gas 'X' has to be nitrogen dioxide.
(c) This type of reaction falls under the category of Decomposition reactions.
(d) The pH of the aqueous solution of gas X would be less than The oxides of non metals are generally acidic in nature. Therefore, their aqueous solutions would exhibit acidic nature.

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