The structure of diborane (B2H6) contains from Chemistry Chemic

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 Multiple Choice QuestionsMultiple Choice Questions

21.

The decreasing values of bond angles from NH3 (106o ) to SbH3 (101o ) down group-15 of the periodic table is due to

  • increasing bp-bp repulsion

  • increasing p-orbital character in sp3

  • decreasing lp-bp repulsion

  • decreasing lp-bp repulsion

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22.

Which one of the following species is diamagnetic in nature?

  • He2+

  • H2

  • H2+

  • H2+

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23.

The number and type of bonds between two carbon atoms in calcium carbide are

  • One sigma, one pi

  •  One sigma, two pi

  • Two sigma, one pi

  • Two sigma, one pi

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24.

Of the following sets which one does NOT contain isoelectronic species?

  • PO-34,SO4-2, ClO4-

  • CN-, N2, C2-2

  • SO3-2, CO3-2,NO3-

  • SO3-2, CO3-2,NO3-

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25.

The structure of diborane (B2H6) contains

  • four 2c-2e bonds and two 3c-2e bonds

  • two 2c-2e bonds and four 3c-2e bonds

  • two 2c-2e bonds and two 3c-3e bonds

  • two 2c-2e bonds and two 3c-3e bonds


A.

four 2c-2e bonds and two 3c-2e bonds

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26.

The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is

  • H2S < SiH4 < NH3 < BF3

  • H2S < NH3 < BF3 < SiH4

  • NH3 < H2S < SiH4 < BF3

  • NH3 < H2S < SiH4 < BF3

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27.

Which one the following sets of ions represents the collection of isoelectronic species?

  • K+ , Ca2+, Sc3+, Cl-

  • Na+ , Mg2+, Al3+, Cl-

  • K+ , Cl- , Mg2+, Sc3+

  • K+ , Cl- , Mg2+, Sc3+

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28.

Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is

  • SO2 < P2O3 < SiO2 < Al2O3

  • Al2O3 < SiO2 < P2O3 < SO2

  • Al2O3 < SiO2 < SO2 < P2O3

  • Al2O3 < SiO2 < SO2 < P2O3

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29.

The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?

  • Bond length in NO+ is greater than in NO

  • Bond length is unpredictable

  • Bond length in NO+ in equal to that in NO

  • Bond length in NO+ in equal to that in NO

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30.

The states of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively

  • sp2 and sp2

  • sp3 and sp3

  • sp3 and sp2

  • sp3 and sp2

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