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Q.

Which of the following is the Dobereiner triad?

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a

Fe, Co, N

b

Ru, Rh, Pd

c

Os, Ir, Pt

d

Li, Na, K

answer is A.

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Detailed Solution

Dobereiner triad:  The atomic weight of middle element is nearly same as average of atomic weights of other two elements. Ex: Li, Na, K.

Ex: Atomic weight of  Na=7+392=23

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