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The d-And-f-Block Elements

Long Answer Type

281. What is the cause of lanthanide contraction?

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Short Answer Type

282. What happens when acidified potassium dichromate solution is added to potassium iodide solution?

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283.

Which out of V(IV) and V(V) is paramagnetic and why?

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284.

Why does a transition series contain only ten elements?

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285.
Why are Cd²⁺salts white?

Transition element exhibit colour to d-d transition.
d-d transition will be possible only when d- subshell is not fully filled.
The electronic configuration of Cd²⁺ is 5d¹⁰ .
It means it has full filled d- subshell. thus there will be not d-d transition take place, so Cd²⁺ is white.

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