Question

A water insoluble substance ‘X’ on reacting with dilute H2SO4
released a colourless & Odourless gas ‘Y’. On bubbling the gas through lime water it initially became milky due to the formation of ‘Z’ and the milkness disappeared when the gas pass in excess & form ‘R’.
X, Y, Z & R respectively are?

Answer 1

X= ANY METAL CARBONATE OR METAL HYDROGEN CARBONATE. ( Eg:- Na2CO3)

Y= CO2

Z= CaCO3

R= CaHCO3

Answer 2

X : Zinc carbonate ZnCO3

Y : Carbon dioxide CO2

Z : Calcium carbonate CaCO3

R : Calcium bicarbonate Ca(HCO3)2

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