The outer electron configuration of Gd (Atomic No : 64) is from

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The plot of square root of frequency of X-ray emitted against atomic number led to suggestion of which law/rule?

  • Periodic law

  • Modern periodic law

  • Hund's rule

  • Newland's law


2.

Which of the following atoms has the highest first ionisation energy?

  • Na

  • K

  • Sc

  • Sc

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3.

Which of the following represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar?

  • Ca <S<Ba<Se<Ar

  • S< Se<Ca<Ba< Ar

  • Ba< Ca<Se< S< Ar

  • Ba< Ca<Se< S< Ar

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4.

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be

  • -2.55 eV

  • -5.1 eV

  • -10.2 eV

  • -10.2 eV

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5.

The increasing order of the ionic radii of the given isoelectronic species is 

  • Cl-, Ca2+, K+, S2-

  • S2-, Cl-, Ca2+,K+

  • Ca2+, K+, Cl-, S2-

  • Ca2+, K+, Cl-, S2-

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6.

The outer electron configuration of Gd (Atomic No : 64) is

  • 4f3 5d5 6s2

  • 4f8 5d0 6s2

  • 4f4 5d4 6s2

  • 4f4 5d4 6s2


D.

4f4 5d4 6s2

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7.

The correct sequence which shows decreasing order of the ionic radii of the elements is

  • Al3+ > Mg2+ > Na+ > F- > O2-

  • Na+ > Mg2+ > Al3+ > O2- > F-

  • Na+ > F- > Mg2+ > O2- > Al3+

  • Na+ > F- > Mg2+ > O2- > Al3+

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8.

The set representing the correct order of ionic radius is

  • Li+> Be2+> Na+> Mg2+

  • Na+>Li+>Mg2+> Be2+

  • Li+>Na+ > Mg2+ > Be2+

  • Li+>Na+ > Mg2+ > Be2+

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9.

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+?

  • Mg2+ < Be2+ < K+ < Ca2+

  • Be2+ < K+ < Ca2+ < Mg2+

  • K+ < Ca2+ < Mg2+ < Be2+

  • K+ < Ca2+ < Mg2+ < Be2+

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10.

The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is 

  • F < S < P < B

  • P < S < B < F

  • B < P < S < F

  • B < P < S < F

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