The re-activity of Ca, Sr, Mg and Ba with water follow the order :

S r > B a > M g > C a

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B a > S r > C a > M g

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C a > M g > B a > S r

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S r > C a > M g > B a

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Solution

The correct option is D $B a > S r > C a > M g$
The re-activity of $C a, S r, M g$ and $B a$ with water follow the order :

$B a > S r > C a > M g$

On moving down the group of alkaline earth metals, the reactivity with water increases.

$B e$ does not react even with boiling water. $M g$ reacts with boiling water. $C a, S r, B a$ react vigorously even with cold water.

Hence option B is correct.

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