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Question

Which of the following releases a gas with the addition of dilute acid?

A
N2
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B
Kl
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C
CCl4
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D
AgNO3
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E
CaCO3
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Solution

The correct option is E CaCO3
CaCO3+2HClCaCl2+H2O+CO2
Thus, calcium carbonate reacts with HCl to form carbon dioxide gas.

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