Assertion (A): Magnesium hardly reacts with cold water
Reason (R): ‘Pt’ has least reactive nature

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Assertion is True, Reason is True and Reason is correct explanation of Assertion

Assertion is True, Reason is False

Assertion is False, Reason is True

Assertion is True, Reason is True but Reason is not correct explanation of Assertion

answer is B.

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Detailed Solution

Magnesium hardly reacts with cold water because magnesium when treated with water forms a protective hydroxide layer on the surface which prevent magnesium from further reacting.

‘Pt’ has the least reactive nature. It is considered as a noble meal.

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