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Q.

The longest periods in the periodic table is

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a

$7^{th}$

b

$5^{th}$

c

$4^{th}$

d

$6^{th}$

answer is B, C.

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Detailed Solution

In modern periodic table, $7^{th}$ , $6^{th}$ both contain 32 elements of they are longest periods.

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