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The d-And-f-Block Elements

Short Answer Type

291.

Which is more basic, La(OH)₃ or Lu(OH)₃? Why?

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292.

Why is Ce⁴⁺ in aqueous solution is good oxidising agent.

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293.

Why do Zr and Hf exhibit similar properties?

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294.

Write any two uses of pyrophric alloys.

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295.

Why do transition metals show catalytic properties?

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296.

Write the formula of the compound in which the transition metal Mn is in +7 oxidation state.

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297.

Why do transition metals display variable oxidation series?

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298.

Explain why Cu(I) is diamagnetic and Copper(II) is paramagnetic.

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299.
What are transition elements? Discuss their magnetic properties.

The transition elements are also known as the d-block elements, because while the outermost level contains at most two electrons, their next to outermost main levels have incompletely filled d sub-orbitals, which are filled-up progressively on going across the periodic table from 8to 18 electrons.

General electronic configuration of d - block element is (n – 1) d^1–10 ns^1-2.

Magnetic property depend on the number of unpaired electron present in it. In transition element magnetic property increase upto Mn and decrease, because first number of electron increase upto Mn and after that pairing occur and thus number of unpaired electron decrease and hence magnetic property decrease.

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