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The D-And-f-Block Elements

Question
CBSEENCH12007288
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Explain the oxidising property of KMnO4 in neutral medium with example.

Solution

The oxidising property of KMnO4 in neutral medium 

(a) A notable reaction is the oxidation of iodide to iodate:
2MnO4– + H2O + I– ——> 2MnO2 + 2OH– + IO3–

(b) Thiosulphate is oxidised almost quantitatively to sulphate:
8MnO4– + 3S2O32– + H2O ——> 8MnO2 + 6SO42– + 2OH–

(c) Manganous salt is oxidised to MnO2; the presence of zinc sulphate or zinc oxide catalyses the oxidation:
2MnO4– + 3Mn2+ + 2H2O ——> 5MnO2 + 4H+

Some More Questions From The d-And-f-Block Elements Chapter

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.

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