Atomic wt. of P is 31 and Sb is 120. What will be the atomic wt. of As, as per Dobernier triad rule?
A
151
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B
75.5
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C
89.5
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D
Unpredictable
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Solution
The correct option is B75.5 Atomic wt. of P is 31 and Sb is 120. The atomic wt. of As, as per Dobernier triad rule will be average of two. It will be 31+1202=1512=75.5