Give a suitable reason why copper and silver do not give out electrons required for the reduction of hydrogen ions present in acids

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Solution

Metals that are higher than H⁺ ions on the Activity Series can be oxidized by the H⁺ ions (i.e. can react with acids to form hydrogen gas)

Metals below H⁺ ions on the Activity Series cannot be oxidized by H⁺, and therefore, will not react with acids to produce hydrogen gas (the metals below hydrogen represent the group of metals used in coins and jewelry)

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α

L i A l H_{4}

H_{2} S O_{3}

H_{2} S O_{4}

H^{+}

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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