Which one of the following is an example of Dobereiner's triad?
Li,Al,Ca
Li,K,Na
Li,Na,K
K,Al,Ca
A
Li,Al,Ca
B
K,Al,Ca
C
Li,K,Na
D
Li,Na,K
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Solution
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Li,Na,K is the example of Dobereineer's triad. Here, the average atomic weights of Li and K equal the atomic weight of Na.
WeightofLi+weightofK2 =7+392 =462 =23
= weight of Na.
Hence, option B is correct.
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