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Question

Metal carbonate reacts with an acid to produce a gas. The gas formed is:

A
hydrogen
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B
carbon dioxide
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C
oxygen
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D
nitrogen
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Solution

The correct option is B carbon dioxide
Metal carbonate reacts with an acid to form the respective salt, carbon dioxide and water. For example:

2HCl(aq)+MgCO3(s)MgCl2(aq)+CO2(g)+H2O(l)

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