As per the Dobereiner's triads, what should be the value of the ‘X’ in the given triad. Li (6.9), Na (X), K (39.0)
A
15.3
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B
23.0
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C
19.0
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D
45.9
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Solution
The correct option is B23.0 Given Li (6.9), Na (X), K (39.0) Applying the property of Dobernier's triads for the above triad- (6.9+39.0)2≈ 23.0 = X ⟹X=23