Atomic radii of Ti, Zr and Hf vary from Chemistry The d-And-f-Bl

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 Multiple Choice QuestionsMultiple Choice Questions

121.

Which element from group V gives most basic compound with hydrogen?

  • Nitrogen

  • Bismuth

  • Arsenic

  • Phosphorus


122.

Point out in which of the following properties oxygen differs from the rest of the members of its family (Group-VIA)?

  • High value of ionisation energies

  • Oxidation states (2,4,6)

  • Polymorphism

  • Formation of hydrides


123.

Which of the following properties increases on going down from F to I in group VII-A of the periodic table?

  • Electronegativity

  • Volatile nature

  • Ionic radius

  • Oxidising power


124.

The oxidation state of oxygen is zero in

  • CO

  • O3

  • SO2

  • H2O2


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125.

Transitional elements are mostly

  • diamagnetic

  • paramagnetic

  • neither diamagnaetic nor paramagnetic

  • diamagentic and paramagnetic both


126.

Which of the following has the highest value of solubility product?

  • CuS

  • Bi2S3

  • CdS

  • ZnS


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127.

Atomic radii of Ti, Zr and Hf vary

  • Ti>Zr> Hf

  • Ti<Zr< Hf

  • Ti< Hf<Zr

  • Ti<Zr=HF


D.

Ti<Zr=HF

Ti, Zr and Hf belong to IV B group of Periodic Table and in a group atomic radii increases on moving down. However, the transition metals of 4d-series have nearly the same radii as metals of Sd-series.
Hence, the order of atomic radii is

         Ti < Zr = Hf

Due to nearly equal atomic radii, Zr and Hf are called chemical twins.


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128.

Which of the following radicals will not be precipitated by passing H2S in concentrated acid solution?

  • Copper

  • Antimony

  • Arsenic

  • Cadmium


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129.

In which of the following solvents, AgBr will have the highest solubility?

  • 10-3 M NaBr

  • 10-3 M NH4OH

  • Pure water

  • 10-3 M HBr


130.

Which transition element of the following outermost electronic configuration shows the highest oxidation state?

  • 3d3, 4s2

  • 3d5, 4s1

  • 3d5, 4s2

  • 3d6, 4s2


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