The oxidation state two units less than the group oxidation state becomes more stable progressively for heavier elements in 13 to 16 groups of periodic table. This is called

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super element effect

lower element effect

inert pair effect

all of these

answer is C.

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Detailed Solution

Down the groups 13 to 16, the ns2 pair shows reluctance to participate in bonding. The effect is called "Inert Pair Effect".

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