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 Multiple Choice QuestionsMultiple Choice Questions

121.

Which of the following electronic configuration will have maximum IP difference between IInd and IIIrd ionisation potential?

  • 1s2, 2s2 2p6, 3s1

  • 1s2, 2s2 2p6, 3s2

  • 1s2, 2s2 2p6

  • 1s2, 2s2 2p5


122.

Which one of the following elements belongs to s-block?

  • Aluminium

  • Chromium

  • Carbon

  • Potassium


123.

Which one is the correct decreasing order of the ionic radii of the ions?

  • N3- > O2-> F- > Na+

  • N3-> Na+> O2- > F-

  • Na+ >O2-> N3-> F-

  • Na+> F-> O2->N3-


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124.

The ionic radii of N3-, O2-, F- and Na+ follow the order

  • N3- > O2- > F- > Na+

  • N3- > Na+ > O2- > F-

  • Na+ > O2- > N3- > F-

  • O2- > F- > Na+ > N3-


A.

N3- > O2- > F- > Na+

All the given ions are isoelectronic. In case of isoelectronic species as atomic number increases ionic radii of ions decreases.  Therefore, 

7N3-8O2-9F-11Na+


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125.

18 carat gold contains

  • 18% gold

  • 24% gold

  • 75% gold

  • 60% gold


126.

Which of the following metals will not form an amalgam?

  • Gold

  • Silver

  • Zinc

  • Iron


127.

The element which liberates oxygen gas from water is

  • P

  • Na

  • F

  • I


128.

The strongest oxidising agent amongst F2, Cl2, Br2 and I2 is

  • F2

  • I2

  • Cl2

  • Br2


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129.

Which of the following is an organo-metallic compound?

  • Lithium ethoxide

  • Ethyl lithium

  • Lithium acetate

  • Lithium carbide


130.

Electronic configuration of H+ is

  • 1s0

  • 1s1

  • 1s2

  • 1s1, 2s1


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