Which of the following pair of compounds will have three sp2 -hyb

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431.

Which of the following pair of compounds will have three sp2 -hybrid orbitals?

  • SO2, CH4

  • SO3, C2H4

  • BF3, SF3

  • I3-, SF4


B.

SO3, C2H4

Among all the given pairs, second pair has sp2- hybrid orbitals.

SO2 is trigonal planar. It has 3 sp2- hybrid orbitals.

CH4 is tetrahedral. It has 4 sp3- hybrid orbitals.

SO3 and C2H4 are trigonalplanar and have 3 sp2- hybrid orbitals.

BF3 is trigonal planar. It also has 3 sp2- hybrid orbitals.

SF4 is irregular tetrahedral. It has 5 sp3d hybrid orbitals.

I3-L is linear and has 5 sp3d hybrid orbitals.


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432.

Consider the following structures

Choose the correct statement regarding the above structures.

  • Dipole moment varies as II > III > I

  • II is more stable than I

  • I is the most reactive among three

  • All of the above


433.

The correct order of magnitude of bond angles among the compounds CH4, NHand H2O is

  • CH4 > H2O < NH3

  • H2O < NH3 < CH4

  • NH3 < CH4 < H2O

  • NH3 < H2O < CH4


434.

The angular shape of ozone molecule (O3) consists of

  • 1 sigma and 2 pi bonds

  • 2 sigma and 2 pi bonds

  • 1 sigma and 1 pi bonds

  • 2 sigma and 1 pi bonds


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435.

Among the following the molecule possessing highest dipole moment is

  • CO2

  • BF3

  • SO2

  • Trans-2-butene


436.

The standard enthalpies of formation of A(NH3), B(CO2), C(HI) and D(SO2) are - 46.19, -393.4, +24.94 and -296.9 kJ mol1 respectively. The increasing order of their
stability is 

  • B < D < A < C

  • C < A < D < B

  • D < B < C < A

  • A < C < D < B


437.

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

  • K< Ca2+ < Mg2+ < Be2+

  • Be2+ < K2+ < Ca2+ < Mg2+

  • Mg2+< Be2+ < K+ < Ca2+

  • Ca2+ < Mg2+ < Be+ < K+


438.

The correct order of basic strength of the following are

  • I > II > IV > III

  • IV > III > II > I

  • II > III > IV I

  • III > IV > II > I


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439.

In the complexes [Fe(H2O)6]3+ , [Fe(CN)6]3-, [Fe(C2O4)3]3- and [FeCl6]3-, more stability is

  • [FeCl6]3-

  • [Fe(C2O4)3]3-

  • [Fe(H2O)6]3+

  • [Fe(CN)6]3-


440.

Which of the following represents the correct order of decreasing number of S = O bonds?

  • H2SO4 > H2SO3 > H2S2O8

  • H2S2O8 > H2SO3 > H2SO4

  • H2S2O8 > H2SO4 > H2SO3

  • H2SO3 > H2S2O8 > H2SO4


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