1(ix)
Assertion (A): Noble gases are unreactive under standard conditions.
Reason (R): Noble gases have complete valence shells making them stable and less likely to gain or lose electrons.
- (a)(A) is true but (R) is false.
- (b)(A) is false but (R) is true.
- (c)Both (A) and (R) are true and (R) is the correct explanation of (A).
- (d)Both (A) and (R) are true but (R) is not the correct explanation of (A).
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Both (A) and (R) are true and (R) is the correct explanation of (A).
Reason — Noble gases have completely filled valence shells (a stable octet, or a duplet in the case of helium). Because of this stable configuration they have almost no tendency to gain or lose electrons, and so they are unreactive under standard conditions. Thus the reason correctly explains the assertion.