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 Multiple Choice QuestionsMultiple Choice Questions

1.

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is

  • +4

  • +6

  • +2

  • +3


D.

+3

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2.

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being

  • 4f orbitals more diffused than the 5f orbitals

  • lesser energy difference between 5f and 6d than between 4f and 5d orbitals

  • more energy difference between 5f and 6d than between 4f and 5d orbitals

  • more reactive nature of the actinoids than the lanthanoids


B.

lesser energy difference between 5f and 6d than between 4f and 5d orbitals

Being lesser energy difference between 5f and 6d than 4f and 5d orbitals.

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3.

A metal, M forms chlorides in it's +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?

  • MCl2 is more volatile than MCl4

  • MCl2 is more soluble in anhydrous ethanol than MCl4

  • MCl2 is more ionic than MCl4

  • MCl2 is more easily hydrolysed than MCl4

C.

MCl2 is more ionic than MCl4

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4.

The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because

  • the 5f orbitals are more buried than the 4f orbitals

  • there is a similarity between 4f and 5f orbitals in their angular part of the wave function

  • the actinoids are more reactive than the lanthanoids

  • the 5f orbitals extend further from the nucleus than the 4f orbitals


D.

the 5f orbitals extend further from the nucleus than the 4f orbitals

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because the 5f orbitals extend further from the nucleus than the 4f orbitals.

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5.

Identify the incorrect statement among the following –

  • d-Block elements show irregular and erratic chemical properties among themselves

  • La and Lu have partially filled d orbitals and no other partially filled orbitals

  • The chemistry of various lanthanoids is very similar

  • 4f and 5f orbitals are equally shielded


D.

4f and 5f orbitals are equally shielded

4f and 5f belong to different energy levels, hence the shielding effect is on them is not the same.Shielding of 4f is more than 5f

323 Views

6.

The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

  • GeX2 << SiX2 << SnX2<< PbX2

  • SiX2 << GeX2 << PbX2<< SnX2

  • SiX2 << GeX2 << SnX2<< PbX2

  • PbX2<< SnX2 << GeX2 << SiX2


C.

SiX2 << GeX2 << SnX2<< PbX2

Due to inert pair effect, the stability of +2 oxidation state increases as we move down this group.

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7.

The lanthanide contraction is responsible for the fact that

  • Zr and Y have about the same radius

  • Zr and Nb have similar oxidation state

  • Zr and Hf have about the same radius

  • Zr and Zn have the same oxidation


C.

Zr and Hf have about the same radius

Due to Lanthanide contraction.

210 Views

8.

Which of the following factors may be regarded as the main cause of lanthanide contraction?

  • Poor shielding of one of 4f electron by another in the subshell

  • Effective shielding of one of 4f electrons by another in the subshell

  • Poorer shielding of 5d electrons by 4f electrons

  • Greater shielding of 5d electrons by 4f electrons


A.

Poor shielding of one of 4f electron by another in the subshell

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9.

Lanthanoid contraction is caused due to

  • the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

  • the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

  • the same effective nuclear charge from Ce to Lu

  • the imperfect shielding on outer electrons by 4f electrons from the nuclear charge


D.

the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

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10.

Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

  • The common oxidation states of cerium are +3 and +4

  • Cerium (IV) acts as an oxidizing agent

  • The +4 oxidation state of cerium is not known in solutions

  • The +3 oxidation state of cerium is more stable than the +4 oxidation state


C.

The +4 oxidation state of cerium is not known in solutions

+3 and +4 states are shown by Ce in aqueous solution.

177 Views