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Q.

Assertion (A): Cobalt was placed before nickel in the Mendeleev periodic table.

Reason (B): Cobalt has less atomic mass than nickel.

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a

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

b

A is true but R is false.

c

A is false but R is true.

d

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

answer is C.

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Detailed Solution

This was done to ensure that the elements with similar chemical properties were put in the same group. Due to this, cobalt was placed before nickel in spite of the fact that cobalt has a higher atomic mass than a nickel.

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