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Q.

The triad not present in group VIII of Mendeleev’s table

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a

Li, Na, K

b

Os, Ir, Pt

c

Fe, Co, Ni

d

Ru, Rh, Pd

answer is A.

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Detailed Solution

The elements Li, Na, K belong to IA group in the periodic table. Hence this triad does not belong to VIII group of Mendeleev’s table. But the other three triads belong to Mendeleev’s VIII group.

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The triad not present in group VIII of Mendeleev’s table