ICSE Class 10 Chemistry 2020 Solved Paper

Identify the salts $P, Q, R$ from the following observations :

Question : 71 of 86

Marks: +1, -0

Salt

{P}

has light bluish green colour. On heating, it produces a black coloured residue. Salt

{P}

produces brisk effervescence with dil.

{\HCl}

and the gas evolved turns lime water milky, but no action with acidified potassium dichromate solution.

Solution:

Salt

{\P}= {\CuCO}_3 \/

Copper carbonate
Copper carbonate is light blue in colour and when heated decomposes to black copper oxide and colourless odourless acidic gas

{\CO}_2

evolved which turns lime water milky but has no effect on

{\K}_2{\Cr}_2 {\O}_7

solution.

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