Q.

Dobereiner triads are

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a

Cl, Br, I

b

S, Se, Te 

c

Li, Na, K

d

All

answer is D.

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Detailed Solution

Dobereiner triads “The atomic weight of middle element is equal to average atomic masses of two elements.

Ex: Li, Na, K Atomic weight of  Na=7+392=23

S, Se, Te Atomic weight of  Se=32+1252=79

Cl, Br, I Atomic weight of Br=355+1272=800

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