Zn + 2HCl = ZnCl² + H2

the gas is collected by downward displacement of air because it's lighter than air.

confirmatory test is that it extinguishes a glowing splinter with pop like sound.

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Hydrogen

Preparation, Properties and Uses of Dihydrogen

Explain the method of prepa...

CHEMISTRY

Explain the method of preparation of hydrogen gas in laboratory with chemical equation and diagram.

ANSWER

In a conical flask, fitted with the delivery tube, few grams of granulated zinc is taken. Then dil. HCl is added. Zinc reacts with HCl to form zinc chloride and hydrogen gas.

Zn+2HCl→ZnCl

2

+H

2

↑.

The liberated hydrogen gas is collected in an inverted test tube placed in a water trough.

solution