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Give reason: Cu^(2+) is paramagnetic a...

Give reason:
`Cu^(2+)` is paramagnetic and `Cu^(+)` is diamagnetic.

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`Cu^(+)` has no unpaired electrons and `cu^(2+)` has one unpaired electron in 3rd orbitals.
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  2. How lanthanoids reacts with water and dil. Acids?

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  3. What is mischmetall? Give its one use.

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  9. Give reasons: Zr and Hf have almost identical radii.

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  19. Give reason: Cu^(2+) is paramagnetic and Cu^(+) is diamagnetic.

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  20. Give reason 'transition metals generally form coloured compound'.

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