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Question

Choose correct option:-
1. Zinc forms colored ions
2. [CoF6]3 is paramagnetic
3.Sc forms +4 oxidation state
4. Zinc is not a transition element

A
1 and 2
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B
1 and 3
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C
2 and 4
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D
3 and 4
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Solution

The correct option is C 2 and 4

Option 1- Zn2+ has no unpaired electrons, it is diamagnetic and thus, colorless.

Option 2- In co-ordination compound [CoF6]3, Co3+ has 4 unpaired electrons, thus, it is paramagnetic.

Option 3- Maximum oxidation state shown by Sc is +3.

Option 4- Zinc atom has completely filled d orbitals (3d10) in its ground state as well as in its oxidised state, hence it is not regarded as a transition element.


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