1.

Which of the following is/are Dobereiner's triad? (a)Li, Na, K(b)Cu, Ag, Zn(c)Fe, Co, Ni(d)Ca, Sr, BaCorrect answer is

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(a) & (B)
(a) & (d)
(b) & (C)
(a),(c) & (d)

ANSWER :B


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