Which one of the following is least chemically reactive?

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Solution

The correct option is A Ar
Noble gases ( group 18 elements) are chemically inert with low reactivity due to stable configuration (completely filled valence electron) with zero valency like He, Ne, Ar, Kr. So, noble gas does not combine with other elements. Argon is a noble gas so it is least chemically reactive.

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Which of the following shows the least chemical reactivity?

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