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a
It is responsible for temporary hardness of water
b
It is insoluble in water
c
On strong heating ‘A’ forms a metal carbonate
d
All are correct
answer is A.
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Detailed Solution
'A' is Ca(HCO3)2It is soluble in water, responsible for temporary hardness of water.Ca(HCO3)2→Δ CaCO3+H2O+CO2CaCO3 →Δ CaO +CO2Ca(HCO3)2 →Strong ∆ CaO+H2O+2CO2