Q.

Dobereiner triads is

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a

P, S, As

b

Mg, S, As

c

Na, K, Rb

d

Cl,Br, I

answer is D.

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Detailed Solution

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According to Dobereiner law of triads the atomic mass of the central element was nearly the arithmetic mean of atomic masses of other two elements.

 

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Dobereiner triads is