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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?

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286.

Which one of the two Co or Zn would be repelled by a magnetic field?

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287.

Why is electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁴ not correct for ground state of Cr (24)?

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288.
How is the magnetic moment of a species related to number of unpaired electrons?

Any ion molecule or atom that has unpaired electron exhibit the stronger magnetic property known as paramagnetism because the magnetic effect of all the electronic with spin up are not canceled by the opposed effect of an equal number of electron with spin down the species is attracted to magnetic field.

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