Which one of the following species does not exist under normal c

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 Multiple Choice QuestionsMultiple Choice Questions

401.

The Correct order of increasing bond length of C - H, C-O, C - C and C = C is

  • C - C < C=C < C - O < C - H

  • C - O < C - H < C - C < C = C

  • C - H < C - O <  C - C < C= C

  • C - H  < C = C < C - O < C - C

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402.

Which of the following is least likely to behave as Lewis base? 

  • NH3

  • BF3

  • OH-

  • H2O

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403.

Which of the following has the minimum bond length?

  • O2-

  • O22-

  • O2

  • O2

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404.

Decreasing order of stability of straight O subscript 2 comma space straight O subscript 2 superscript minus comma space straight O subscript 2 superscript plus comma space and space straight O subscript 2 superscript 2 minus end superscript is

  • straight O subscript 2 superscript plus space greater than space straight O subscript 2 space greater than space straight O subscript 2 superscript minus space greater than space straight O subscript 2 superscript 2 minus end superscript
  • straight O subscript 2 superscript 2 minus end superscript space greater than space straight O subscript 2 superscript minus space greater than space straight O subscript 2 space greater than space straight O subscript 2 superscript plus
  • straight O subscript 2 space greater than straight O subscript 2 superscript plus space greater than space straight O subscript 2 superscript 2 minus end superscript space greater than thin space straight O subscript 2 superscript minus
  • straight O subscript 2 space greater than straight O subscript 2 superscript plus space greater than space straight O subscript 2 superscript 2 minus end superscript space greater than thin space straight O subscript 2 superscript minus
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405.

Which of the following structures is the most preferred and hence of lowest energy of SO3

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406.

In which of the following pairs, both the species are not isostructural?

  • SiCl4.PCl4+

  • Diamond, carbide

  • NH3, PH3

  • NH3, PH3

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407.

In which of the following pairs of molecules/ions, the central atoms have sp2 hybridization?

  • NO2- and NH3

  • BF3 and NO2-

  • NH2- and H2O

  • NH2- and H2O

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408.

Which one of the following species does not exist under normal conditions?

  • Be2+

  • Be2

  • B2

  • B2


B.

Be2

Molecules with zero bond order do not exist.

a) Be2+ (4 + 4 -1 = 7) = σ1s2 σ*1s2, σ2s2, σ2s1

BO = 4 - 3 / 2  = 0.5

b) Be2 (4 + 4 = 8 )  = σ1s2, σ*1s2, σ2s2, σ*2s2


BO = 4 - 4 / 2 = 0

c) B2 = (5 + 5) = 10

= σ1s2 , σ*1s2, 2σs2, σ*2s2, π2px1 = π2py1

BO = 6 - 4 /2 = 1

d) Li2 (3 + 3) = 6

= σ1s2 , σ*1s2,σ2s2

BO = 4 - 2 / 2 = 1

Thus, bond order of Be2 does not exist under normal conditions.


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409.

In which one of the following species the central atom has the type of hybridisation which si not the same as that present in the other three? 

  • SF4

  • I3-

  • SbCl52-

  • SbCl52-

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410.

The correct order of the decreasing ionic radii among the following isoelectronic species is

  • Ca2+ > K+ >S2- > Cl-

  • Cl- > S2- > Ca2+ > K+

  • S2- > Cl- > K+ > Ca2+

  • S2- > Cl- > K+ > Ca2+

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