Cl, Br, I follows Dobereiner's triads, the atomic masses of Cl and I are 35.5 and 127 respectively. 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
According to Dobereneir's triads, the atomic mass of Br will be average of the atomic masses of CI & I.

$=$ $\frac{35.5 + 127}{2}$ $=$ 81.25

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Similar questions

C l = 35.5

I = 127

B r

[Given: Atomic mass of elements : L i = 6.9, N = 14, N a = 23, P = 31, C l = 35, K = 39 C a = 40, A s = 74.9, B r = 79.9, S r = 87.6, I = 126.9, B a = 137.3]

^{35}

^{37}

34.97

36.97

35.5

^{35}

Element	Chlorine (Cl)	X	Iodine (I)
Atomic Mass (A)	35.5	Y	126.9

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