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Q.

The law of triads is applicable to a group of 

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a

Cl, Br, I

b

Na, K, Rb

c

C, N, O

d

H, O, N

answer is A.

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Detailed Solution

According to the law of triads the atomic wt. of the middle element is arithmetic mean of I and III. At wt. of Br =At.wt  of  Cl  +at  wt  of  I2

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