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 Multiple Choice QuestionsMultiple Choice Questions

241.

The pair having the similar shape is

  • BF3 and NF3

  • BF4- and NH4+

  • SiCl4 and SCl4

  • CH3+ and H3O+


242.

Which one of the following molecules has zero dipole moment?

  • NO2+

  • H2O

  • NH3

  • CO


243.

Pick out the isoelectronic structures from the following

 CH3+;    H3O+; NH3;  CH3- I            II           III         IV

  • I and II

  • I and III

  • I and IV

  • II, III and IV


244.

Which of the following will have the shape of a trigonal bipyramid?

  • PF3Cl2

  • IF5

  • BrF5

  • SbF52-


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245.

The example of σ-complex is

  • Fe(η5-C5H5)2

  • [Cr(CO)6]

  • Al2(CH3)6

  • Zeiss salt


246.

The bond present in N2O5 are

  • only ionic

  • covalent and coordinate

  • only covalent

  • covalent and ionic


247.

Which of the following statements is false?
1. Non-bonding pairs occupy more space than bonding pairs.

2. The bonding orbitals in trigonal bipyramidal molecule are described as sp3d hybrids.

3. SnCl2 has linear shape.

4. PCl4+ and AlCl4- are isoelectronic.

  • 1

  • 2

  • 3

  • 4


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248.

The correct order of increasing C-O bond length of CO, CO2 and CO32- is

  • CO32- < CO2 < CO

  • CO2 < CO32- < CO

  • CO < CO32- < CO2

  • CO < CO2 < CO32-


D.

CO < CO2 < CO32-

Bond length  1Bond order

Bond order in CO = 3 (By molecular orbital theory)

Bord order in CO2Number of bonds in all possible sidesNumber of resonating structures

42 = 2

Bond order in CO32- = 43 = 1.33

 Order of bond order  CO32- < CO2 < CO

So, the order of bond length of C-O will be

CO < CO2 < CO32-


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249.

Covalent compounds have low melting point because

  • covalent molecules are held by weak van der Waal's force of attraction

  • covalent bond is less exothermic

  • covalent bond is weaker than ionic bond

  • covalent molecules have definite shape


250.

The bond order in CN- ion is

  • 2.5

  • 3

  • 2

  • 3.5


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