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Question

Sodium reacts with water vigorously than lithium because:

A
It has higher atomic mass
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B
It is more electropositive
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C
It is more electronegative
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D
It is a metal
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Solution

The correct option is B It is more electropositive
As we go down the group the ease with which the electron can be extracted increases. Thus Na is more electropositive compared to lithium, leading to higher reactivity towards water.

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