Give reason Sodium, potassium or calcium should not be used to prepare hydrogen from acids.

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Solution

Sodium, Potassium, and Calcium cannot be used to prepare hydrogen from acids because these are highly reactive metals and they react vigorously with water oxygen, and acids.
These even react with cold water to produce hydroxides and hydrogen So these metals can displace hydrogen from acids.

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Similar questions

Give reason Lead is not used to prepare hydrogen from acids.

Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Lead is not used for the preparation of hydrogen from acid give reason.

Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.

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