Why calcium and magnesium are not used for the preparation of hydrogen gas?

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Solution

Calcium and magnesium are expensive and secondly, the rate of reaction is very fast and difficult to collect hydrogen gas.
Calcium is not used in the laboratory for the preparation of hydrogen gas as calcium has a very uncontrollable reaction with dilute $H_{2} {SO}_{4}$ or dilute $HCl$ .

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Why calcium and magnesium are not used for the preparation of hydrogen gas?

Calcium and magnesium are expensive and secondly, the rate of reaction is very fast and difficult to collect hydrogen gas.Calcium is not used in the laboratory for the preparation of hydrogen gas as calcium has a very uncontrollable reaction with dilute H2SO4or diluteHCl.

Calcium and magnesium are expensive and secondly, the rate of reaction is very fast and difficult to collect hydrogen gas.
Calcium is not used in the laboratory for the preparation of hydrogen gas as calcium has a very uncontrollable reaction with dilute $H_{2} {SO}_{4}$ or dilute $HCl$ .