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Q.

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

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a

$Sr$ and $SrO$

b

$Be$ and $BeO$

c

$Ca$ and ${CaH}_{2}$

d

$Mg$ and $MgO$

answer is C.

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Detailed Solution

$Ca + 2 H_{2} O \to Ca (OH)_{2} + H_{2}$

${CaH}_{2} + 2 H_{2} O \to Ca (OH)_{2} + 2 H_{2}$

The same $H_{2}$ gas is produced in both of the aforementioned processes.

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