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The d-And-f-Block Elements
Question
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What happens when an acidic solution of the green compound ‘B’ is allowed to stand for sometime? Give the equation involved. What is the type of reaction called?

Answer

When an acidic solution of the green compound B(K2MnO4) is allowed to stand for some time potassium manganate is oxidised to potassium permangnate.
The type of reaction is oxidation reaction

3K2MnO4 + 2CO2 → 2K2CO3 + 2MnO2  ↓ + 2KMnO4

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

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Explain why Cu+ ion is not stable in aqueous solutions?

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.