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The D-And-f-Block Elements

Question
CBSEENCH12011206
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Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of 

  • CrO42-

  • Cr2(SO3)3

  • CrSO4

  • Cr2(SO4)3

Solution

D.

Cr2(SO4)3

K2Cr2O7 +3Na2SO3 + 4H2SO4 → 3Na2SO4 +K2SO4 + Cr(SO4)3 +4H2O
Chromium(III) sulfate gives green colour.

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

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?

Why are transition elements so named?

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