Assertion: Co(IV) is known but Ni(IV) is not. Reason: Ni(IV) has d4 electronic configuration.

Question

Assertion: Co(IV) is known but Ni(IV) is not. Reason: Ni(IV) has d4 electronic configuration. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

Both Co and Ni have (IV) oxidation state. Ni (IV) has 3d6 electronic configuration. Metals Outer electronic configuration Oxi. states Co 3d74s2 +2, +3, +4 Ni 3d84s2 +2, +3, +4

Q. Assertion : Co(IV) is known but Ni(IV) is not.
Reason : Ni(IV) has $d^{4}$ electronic configuration.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Both Co and Ni have (IV) oxidation state. Ni (IV) has $3 d_{6}$ electronic configuration.

Metals Outer electronic
configuration Oxi. states

Co 3d⁷4s² +2, +3, +4

Ni 3d⁸4s² +2, +3, +4

Metals	Outer electronic configuration	Oxi. states
Co	3d⁷4s²	+2, +3, +4
Ni	3d⁸4s²	+2, +3, +4

Q. Assertion : Co(IV) is known but Ni(IV) is not. Reason : Ni(IV) has d4 electronic configuration.