Which of the following is/are Dobereiner's triad? P (a) P, As, Sb W...

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Which of the following is/are Dobereiner's triad?
P
(a) P, As, Sb
W
(b) \( \mathrm{Cu}, \mathrm{Ag}, \mathrm{Au} \)
(c) \( \mathrm{Fe}, \mathrm{Co}, \mathrm{Ni} \)
(d) \( \mathrm{S}, \mathrm{Se} \), Te Correct answer is:-
(1) a and \( b \)
(2) b and c
(3) a, c and d
(4) All
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