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Question

Atomic mass of X and Z is 20 and 40 respectively. If X, Y and Z is Dobereiner's Triad. What can be the atomic number of Y?


A

20

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B

40

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C

30

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D

All of these

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Solution

The correct option is C

30


The mass of middle element was roughly the average of atomic masses of other two elements in Doberner's triad. Since Y is the middle element of the triad, its mass should be the average of 20 and 40, i.e. 30.

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