s-Block ElementsHard
Question
A colourless solid (X) on heating evolved CO2 and also gave a white residue, soluble in water. Residue also gave CO2 when treated with dilute acid. (X) is :
Options
A.K2CO3
B.CaCO3
C.KHCO3
D.Na2CO3
Solution
KHCO3 
K2CO3 (soluble in water) + CO2 + H2O.
K2CO3 + H2SO4 → K2SO4 + CO2 + H2O.
K2CO3 (soluble in water) + CO2 + H2O.K2CO3 + H2SO4 → K2SO4 + CO2 + H2O.
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