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The D-And-f-Block Elements

Question

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Give chemical equation of reaction when pyrolusite ore is fused with KOH in presence of air.

Solution

When pyrolusite is fused with KOH in air green colour of potassium mangante is formed.

\underset{pyrolusite ore}{2 {MnO}_{2}} + 4 KOH + O_{2} \to \underset{Potassium manganate}{2 K_{2} {MnO}_{4}} + 2 H_{2} O

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

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.

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

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