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Q.

Three elements X, Y, Z are following Dobereiner's Triad rule. If the atomic weight of X and Y are 10 and 26 respectively, then atomic weight of Z will be:

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a

42

b

34

c

40

d

18

answer is C.

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Detailed Solution

The atomic weight of X and Y are 10 and 26. By Dobereiner's Triad rule.

Ay=Ax+Az2 ⇔26=10+Az2 ⇒Az=52-10 ⇒Az=42

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