The correct order of the decreasing ionic radii among the follow

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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

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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+


C.

S2- > Cl- > K+ > Ca2+


During the formation of a cation, the electrons are lost from the outer shell and the remaining electrons experience a great force of attraction by the nucleus, ie, attracted more towards the nucleus. In other words, nucleus holds the remaining electrons more tightly and result in decreased radii.
However, in the case of anion formation, the addition of an electron (s) takes place in the same outer shell, thus the hold of the nucleus on the electrons of outer shell decreases and this result in increased ionic radii.

Thus, the correct order of ionic radii is 

S2- > Cl- > K+ > Ca2+
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