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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?

La(OH)3 is most basic and Lu(OH)3 is least basic.

Due to lanthanide contraction. As the size of lanthanide ions decreses from La³⁺ to Lu³⁺ , the covalent character of the hydroxides increases and hence the basic strength decreases.

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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.

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300.

Describe the oxidation states and variable valencies of elements of 3d series.

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

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

291.
Which is more basic, La(OH)₃ or Lu(OH)₃? Why?