If Cl, Br, I, is a Dobereiner's triad and the atomic masses of Cl and I are 35.5u and 127u respectively, then the atomic mass of Br is

162.5

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91.5

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81.25

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45.625

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Solution

The correct option is C 81.25
In a triad, the atomic mass of the central atom is nearly an average of the other two atoms. In the triad Cl, Br, I, the mass of Br will be average mass of Cl and I.

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Cl, Br, I, if this is a Dobereiner's triad and the atomic masses of Cl and I are 35.5 and 127 respectively, then the atomic mass of Br is -

C l = 35.5

I = 127

B r

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