The number of d- electrons in Fe2+ (Z = 26) is not equal to the

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following species contains an equal number of σ and Π bond? 

  • HCO3-

  • XeO4

  • (CN)2

  • (CN)2

2307 Views

2.

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?

  • Ar < K+< Ca2+

  • Ca2+ < Ar < K+

  • Ca2+ < K+ < Ar

  • Ca2+ < K+ < Ar

1221 Views

3.

Solubility of the alkaline earth's metal sulphates in water decreases in the sequence

  • Mg>Ca>Sr>Ba

  • Ca>Sr>Ba>Mg>

  • Sr>Ca>Mg>Ba

  • Sr>Ca>Mg>Ba

734 Views

4.

Which of the following pairs of ions are isoelectronic and isostructural? 

  • CO subscript 3 superscript 2 minus end superscript comma space SO subscript 3 superscript 2 minus end superscript
  • ClO subscript 3 superscript minus comma space CO subscript 3 superscript 2 minus end superscript
  • SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus
  • SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus
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5.

Magnetic moment 2.84 BM is given by (At. no. Ni= 28, Ti= 22, Cr=24, Co = 27)

  • Ni2+

  • Ti3+

  • Cr3+

  • Cr3+

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6.

If the value of an equilibrium constant ofr particular reaction is 1.6 x1012 then at equilibrium the system will contains

  • all reactants

  • mostly reactants

  • mostly products

  • mostly products

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7.

The number of d- electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following?

  • S- electronic in Mg (Z=12)

  • p-electrons in Cl( Z=17)

  • d- electrons in Fe (Z=26)

  • d- electrons in Fe (Z=26)


B.

p-electrons in Cl( Z=17)

Electronic configuration of Fe2+ is [Ar]3d6 4s0 
therefore, Number of electrons  = 6
Mg- 1s2 2s2 2p6  (6s electrons)
It matches with the 6d electrons of Fe2+ 
Cl- 1s2 2s2 2p6 3s2 3p5 (11 p electrons)
It does not match with the 6d  electrons of Fe2+
Fe- [Ar] 3d6 4s2 (6d electrons)

It does not match with the 6d electrons of Fe2+
Ne- 1s2 2s2 2p6 3s2 3p 6 (6p electrons)
It matches with the 6d electrons of Fe2+.
Hence, Cl has 11 p electrons which do not match in number with 6d electrons of Fe2+

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8.

The angular momentum of electrons in d orbital is equal to

  • square root of 6 space h
  • square root of 2 straight h
  • 2 square root of 3 straight h
  • 2 square root of 3 straight h
827 Views

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9.

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 x 10-12, 1.8 x 10-11, 8.3 x 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4

  • AgI

  • AgCl

  • AgBr

  • AgBr

4272 Views

10.

Which of the following statements is correct for a reversible process in a state of equilibrium?

  • ΔG = -2.303RT log K
  • ΔG = 2.303RT log K

  • ΔG0 = -2.303RT log K

  • ΔG0 = -2.303RT log K

1043 Views

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