Question

solution
16. (a) A metal compound X reacts with dil.
H.SO, to produce effervescence The gas
evolved extinguishes a burning candle.
If one of the compounds formed is
calcium sulphate, then what is 'X' and
the gas evolved? Also write a balanced
chemical equation for the reaction
which occurred
(b) () Name one antacid. How does it
help to relieve indigestion in
stomach?
(ii) A farmer treats the soil with quick
lime or calcium carbonate. What
is the nature of soil? Why does
the farmer treat the soil with
quick lime? . !CBSE 2012)​

Answer 1

Answer: The gas evolved is carbon dioxide and the compound is calcium carbonate(CaCO3)

CaCo3 + H2SO4 -------- CaSO4 + CO2 + H20

(i) Na2CO3. It reduces the excess HCl in the stomach by neutralizing it as Na2CO3 is a base

(ii) He will use quick lime(CaO). The soil is acidic in nature. He does as to neutralize the acid the soil as CaO is a base