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Q.

Assertion (A): Helium is highly stable and chemically inert.

Reason (R):  Helium follows octet rule.

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a

A is correct, Ri s incorrect

b

Both A and R are correct and R is not the correct explanation of A

c

Both A and R are correct and R is the correct explanation of A

d

A is incorrect, R is correct

answer is C.

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Detailed Solution

The electronic configuration of Helium (He) is 1s2. It follows duplet rule.

It has duplet configuration. It does not react with other elements. Hence it is chemically inert and highly stable.

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