NEET 2017 | d and f Block Elements Question 23 | Chemistry

NEET 2017

MCQ (Single Correct Answer)

-1

The reason for greater range of oxidation states in actinoids is attributed to

actinoid contraction

5$$f$$, 6d and 7s levels having comparable energies

4$$f$$ and 5d levels being close in energies

the radioactive nature of actinoids.

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

Which one of the following statements related to lanthanoids is incorrect?

Europium shows + 2 oxidation state.

The basicity decreases as the ionic radius decreases from Pr to Lu.

All the lanthanons are much more reactive than aluminium.

Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis.

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No.65) are

[Xe]4f⁶5d¹6s²,
[Xe]4f⁷5d¹6s² and [Xe]4f⁸5d¹6s²

[Xe]4f⁷ 6s², [Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁹ 6s²

[Xe]4f⁷ 6s², [Xe]4f⁸ 6s² and [Xe]4f⁸ 5d¹ 6s²

[Xe]4f⁶ 5d¹ 6s², [Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁹ 6s²

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

Which one of the following statements is correct when SO₂ is passed through acidified K₂Cr₂O₇ solution?

SO₂ is reduced.

Green Cr₂(SO₄)₃ is formed.

The solution turns blue.

The solution is decolourised.

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