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(C) The correct option is $(C)$.Explanation:$Ca$ and $CaH_2$ both react with water to produce calcium hydroxide $(Ca(OH)_2)$ and hydrogen gas $(H_2)$.

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$Ca$ and $CaH_2$

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(C) The correct option is $(C)$.Explanation:$Ca$ and $CaH_2$ both react with water to produce calcium hydroxide $(Ca(OH)_2)$ and hydrogen gas $(H_2)$.Reaction for $Ca$:$Ca + 2 H_2O \rightarrow Ca(OH)_2 + H_2$Reaction for $CaH_2$:$CaH_2 + 2 H_2O \rightarrow Ca(OH)_2 + 2 H_2$Note: While the stoichiometry of $H_2$ produced differs,the chemical species produced ($Ca(OH)_2$ and $H_2$) are the same.

$A$ pair of substances which gives the same products on reaction with water is

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