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Some materials available in the laborato...

Some materials available in the laboratory are given below.
Magnesium ribbon, marble powder, Marble pieces, dilute HCl, concentrated HCl.
a) Which materials will you choose for the preparation of more `CO_2` in less time?
b) Write the balanced chemical equation for the reaction.

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a) Powdered marble and concentrated HCl
b) .CaCO_3 + 2HCl rarr CaCl_2 + H_2O + CO_2.
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