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Directions: In the following questions, ...

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Mendeleev' 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.

A

Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

B

Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).

C

Assertion (A) is true but reason (R) is false.

D

Assertion (A) is false but reason (R) is true.

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