If \( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are the three elements of Dobereiners Triad...

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If \( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are the three elements of Dobereiners Triad and atomic mass of \( \mathrm{A} \) and \( \mathrm{B} \) are 7 and 15
\( \mathrm{P} \)
respectively then the atomic mass of \( \mathrm{C} \) is:
W
(1) 1
(2) 11
(3) 23
(4) 25
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