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Reactivity Series

Assertion: So...

Question

Assertion: Sodium reacts vigorously with cold water but magnesium does not react with cold water.
Reason: Sodium is more reactive than magnesium.

A

Assertion: True, Reason: False

Reason is not the correct explanation of assertion.

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B

Assertion: True, Reason: True

Reason is the correct explanation of assertion.

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C

Assertion: False, Reason: False

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D

Assertion: False, Reason: True

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Solution

The correct option is B Assertion: True, Reason: True

Reason is the correct explanation of assertion.
Sodium reacts vigorously with water and produces sodium hydroxide and hydrogen gas. The hydrogen gas evolved immediately catches fire as the reaction is highly exotermic.
The reaction involved is:

${2Na(s) + 2H}_{2} O(l) \to {2NaOH(aq) + H}_{2} (g)$

On the other hand, magnesium does not react with cold water and hot water. It reacts only with steam. The reaction involved is:

${2Mg(s) + 2H}_{2} O(g) \to {2MgO(s) + H}_{2} (g)$

This proves sodium is much more reactive than magnesium.

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