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1. Zn + 2 HCl → ZnCl2 + H2

2. Treating of aluminum powder with NaOH or KOH solutions.

2 Al + 6 H2O + 2 NaOH → 2 NaAl(OH)4 + 3 H2

Aluminium2 Al + 6 H2O + 2 OH− → 2 Al(OH)−

4 + 3 H2

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Why copper is not used to prepare hydrogen in the laboratory?

Copper is not typically used to prepare hydrogen in the laboratory because it is not reactive enough to displace hydrogen from water or acids. Other metals like zinc or aluminum are more commonly used for this purpose as they have a higher reactivity with water or acids.


Why concentrated hydrochloric acid is not used to prepare hydrogen gas in laboratory?

Concentrated hydrochloric acid (HCl) is not typically used to prepare hydrogen gas in the laboratory because it can react violently with some metals, leading to the release of hazardous hydrogen gas and potentially causing explosions. Dilute hydrochloric acid is safer to use for this purpose as it produces hydrogen gas more slowly and can be better controlled.


Why is the reaction between potassium and dilute acids not used to prepare hydrogen in the laboratory?

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Why is pure zinc not used to prepare hydrogen gas?

Pure zinc is not used to prepare hydrogen gas because it does not react with water to produce hydrogen gas. Instead, zinc reacts with acids like hydrochloric acid to form zinc chloride and release hydrogen gas. This reaction is utilized in the laboratory to produce hydrogen gas.


How is hydrogen gas prepared in the laboratory?

Hydrogen gas can be prepared in the laboratory through the reaction of a metal (such as zinc or aluminum) with an acid (such as hydrochloric acid). The metal reacts with the acid to produce hydrogen gas as one of the products. This method is safe and commonly used for producing hydrogen gas on a small scale in the laboratory.


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