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Question

Atomic mass of X and Z are 20 and 40 respectively. If X, Y and Z are in Dobereiner’s triads, what should be the atomic mass of Y?


  1. 40

  2. 30

  3. 60

  4. 20


Solution

The correct option is B

30


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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