X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner's triads. Atomic mass of Z=?

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125

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130

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None of the above

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Solution

The correct option is B
125

Atomic mass of Y = (Atomic mass of X + Atomic mass of Z)/2

81 = (37 + x) /2

162 -37 = x

x = 125

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