Question

A metal ________ hydrogen in the reactivity series gives hydrogen with _______

Answer 1

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The metals above hydrogen in the Reactivity Series can react with with dilute acids, giving off hydrogen gas. Those metals below hydrogen in the Reactivity Series do not react with dilute acids.

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Answer 2

A metal which lies above hydrogen in the reactivity series gives hydrogen with acids.

Explanation:

Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

Metals which are placed higher then hydrogen are more reactive than hydrogen and thus can easily lose electrons as compared to hydrogen.

Sodium easily lose electrons than hydrogen and get oxidized to $Na^+$ and $H^+$ get reduced to give Hydrogen.

$2Na+2HCl\rightarrow 2NaCl+H_2$

Learn More about single displacement reactions

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