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Q.

Atomic weight of Eka Al predicted by Mendeleef's is' X' and its experimental value is 'Y'. Then correct order is

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a

X = Y/2

b

X > Y

c

X = Y

d

X < Y

answer is C.

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Detailed Solution

In Mendeleleef’s periodic table Eka Aluminium comes after Aluminium and its atomic weight is 68 (X). In the modern periodic table Gallium comes after Aluminum and its atomic weight is 69.9 (Y).

Which shows X < Y

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