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The law of triad is applicable to a grou...

The law of triad is applicable to a group of a)`Cl, Br, I` b)C,N,O c)`Na,K,Rb` d)`H,O,N`

A

Cl, Br, I

B

C, N, O

C

Na, K, Rb

D

H, O, N

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The correct Answer is:
A
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