IGCSE Chemistry 0971/11/M/J/21 Q32


32 A white solid Z reacts with dilute hydrochloric acid to produce a gas.
The same gas is produced when compound Z is heated strongly.
What is Z?
A calcium
B calcium carbonate
C calcium hydroxide
D calcium oxide

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Answer ( 1 )


    Ans: B

    CaCO3 + 2HCl –> CaCl2 + H2O + CO2

    CaCO3 –> CaO + CO2

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