Assertion (A) Mendeleev's left the gap under aluminium and silicon and called these Eka-aluminium and Eka-silicon, respectively.Reason (R) Dobereiner arranged elements on the basis of increasing atomic number.

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Both A and R are correct; R is the correct explanation of A.

Both A and R are correct; and R is not the correct explanation of A.

A is correct; R is incorrect.

R is correct; A is incorrect.

answer is C.

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Detailed Solution

Dobereiner arranged elements on the basis of increasing atomic weights

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