CBSE Class 10 Science 2019 Outside Delhi Set 1

Question : 6 of 27

Marks: +1, -0

On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide,

{\O}_2

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

( {\NO}_2)

(b)

{2 {\Cu} ( {\NO}_3) _2}↙{\text "Blue"} ⋅ 3 {\H}_2 {\O} {→}↖{∆} {2 {\CuO}}↙{\text "Black"}

+{4 {\NO}_2 ↑+}↙{\text "Brown gas"} {\O}_2 ↑+6 {\H}_2 {\O}

{\pH}

would be less than 7 or 6.9

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