1
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Question

# If A, B and C are the three hypothetical elements of Dobereiner's Triads and atomic mass of A and B are 7 and 15 respectively then the atomic mass of C is :

A
1
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B
11
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C
23
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D
25
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Solution

## The correct option is C 23Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad. ∴MB=MA+MC2 ⟹15=7+MC2 ∴MC=23 Hence, the correct answer is option (c)

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