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Q.

Atomic weights of  Li and Na are  ‘X’ and ‘Y’ respectively.  Atomic weight of ‘K’  is

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a

X +Y2

b

X-Y2

c

2-YX

d

2Y-X

answer is D.

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Detailed Solution

According to Dobereiner, atomic weight of middle element is the arithmetic mean of the other two elements.At.wt of Na(Y)=X+At.wt of 'K'2
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