Which gas is releasedhen CaCO_3 reacts with dilute HCl ? (a) H_2 (b) CO_2 (c) O_2 (d) Cl_2

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Which gas is released when CaCO_3 reacts with dilute HCl ?
(a) H_2
(b) CO_2
(c) O_2
(d) Cl_2

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