d and f-Block Elements Test

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d and f-Block Elements Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

The number of water of crystallization in hydrated copper sulphate is

A
5

B
4

C
2

D
1

Solution

Four molecules of H₂O are present as ligands and there is one as water of crystallization.
Question 2
1 / -0

Transition elements form coordination complexes because of

A
presence of empty orbitals in the valence shell

B
high charge density

C
Both (1) and (2)

D
None of these

Solution

Transition elements form coordination complexes because of small size of metal ion, high charge density and availability of empty d-orbitals.
Question 3
1 / -0

The chromium atoms in both Cr₂O₇^2-and CrO₄^2- are sp³ hybridised. All the Cr-O bonds are equivalent in

A
Cr₂O₇^2-

B
both Cr₂O₇^2- and CrO₄^2-

C
CrO₄^2-

D
None of these

Solution

In the dichromate ion, the two Cr-O bonds that share an oxygen at the common vertex of the two tetrahedral units have the bond length of 179 pm, whereas the other Cr-O bonds have the bond length of 163 pm.
Question 4
1 / -0

Which of the following oxides is amphoteric?

A
Mn₂O₇

B
CrO₅

C
MnO₂

D
Cr₂O₃

Solution

The oxides with the metal atom in lower oxidation states (+2 and +3) are basic. Cr₂O₃ is an exception and is amphoteric. The oxides with the higher oxidation state of the metal are generally acidic.
Question 5
1 / -0

Which two lanthanoids are added as light filters to glass filter goggles?

A
Sm and Pr

B
Nd and La

C
Eu and Pr

D
Pr and Nd

Solution

Praseodymium and Neodymium absorb yellow light when added to glass.
Question 6
1 / -0

Lanthanoids are soft metals with a silvery white sheen. The exception to this fact is

A
La

B
Sm

C
Ce

D
Pr

Solution

Samarium is steel hard.
Question 7
1 / -0

K₂Cr₂O₇ reacts with NH₄Cl in the presence of H₂SO₄. The product formed is

A
chromyl chloride with green vapour

B
chromous chloride with white vapour

C
chromous chloride with blue vapour

D
chromyl chloride with deep red vapour

Solution

K₂Cr₂O₇, when heated with conc. H₂SO₄, gives soluble chlorides of chromyl with deep red vapour.
Question 8
1 / -0

The relative composition of lanthanides in mischmetal is

A
50% Ce and 25% La

B
40% La and 50% Ce

C
50% La and 50% Ce

D
40% La and 40% Ce

Solution

Mischmetal or mixed metal is an alloy of rare earth elements. It is also called cerium mischmetal, rare earth mischmetal. A typical composition includes approximately 50% cerium and 25% lanthanum, with small amounts of neodymium and praseodymium.

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d and f-Block Elements Test - 9

Result

d and f-Block Elements Test - 9

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Question 1

5

4

2

1

Solution

Question 2

presence of empty orbitals in the valence shell

high charge density

Both (1) and (2)

None of these

Solution

Question 3

Cr2O72-

both Cr2O72- and CrO42-

CrO42-

None of these

Solution

Question 4

Mn2O7

CrO5

MnO2

Cr2O3

Solution

Question 5

Sm and Pr

Nd and La

Eu and Pr

Pr and Nd

Solution

Question 6

La

Sm

Ce

Pr

Solution

Question 7

chromyl chloride with green vapour

chromous chloride with white vapour

chromous chloride with blue vapour

chromyl chloride with deep red vapour

Solution

Question 8

50% Ce and 25% La

40% La and 50% Ce

50% La and 50% Ce

40% La and 40% Ce

Solution

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Cr₂O₇^2-

both Cr₂O₇^2- and CrO₄^2-

CrO₄^2-

Mn₂O₇

CrO₅

MnO₂

Cr₂O₃