Which of the following is/are Dobereiner's triad? P (a) \( \mathrm{...

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