Explain why concentrated HCL is not used in the laboratory preparation of `H_(2)` gas.

Why HNO_(3) is not used in the laboratory preparation of dihydrogen ?

Give reason for the following: Concentrated sulphuric acid is not used in the laboratory preparation of hydrogen.

Why is dilute H_2SO_4 not used in the Laboratory preparation of CO_2 ?

Explain the laboratory preparation of dihydrogen.

Explain the laboratory preparation of dihydrogen.

Why paste of BaO_(2) is used in laboratory preparation of H_(2) O_(2) ?

Dil. HCl is used in laboratory preparation of hydrogen and not HNO_(3) .

How is H_2S prepared in the laboratory ?