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Question

All metallic _______ give out carbon dioxide gas when treated with dilute acids.

A
carbonates
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B
oxides
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C
halides
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D
sulphates
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Solution

The correct option is A carbonates
Carbonates give carbon dioxide with dilute acids.like sodium carbonate with dil aq. HCl shows following reaction .:
Na2CO3+2HCl2NaCl+CO2+H2O

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