Important Questions of Chemical Bonding and Molecular Structure Chemistry | Zigya

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141.

Which of the following is paramagnetic with bond order 0.5?

  • F2

  • H2+

  • N2

  • O2-


142.

Match List-I with List-II and choose the correct matching codes from the choices given.
List - I List - II
A. PCl5 1. Linear
B. IF7 2. Pyramidal
C. H3O+ 3. Trigonal bipyramidal
D. ClO2 4. Tetrahedral
E. NH4+

5. Pentagonal bipyramidal

6. Angular

  • A - 3; B - 5; C - 2; D - 1; E - 4

  • A - 3; B - 5; C - 4; D - 1; E - 2

  • A - 3; B - 5; C - 6; D - 1; E - 2

  • A - 3; B - 5; C - 2; D - 6; E - 4


143.

Among the following, the pair in which the two species are not isostructural are

  • IO3- and XeO3

  • PF6- and SF6

  • BH4- and NH4+

  • CO32- and NO2-


144.

Which of the following ions has a magnetic moment of 5.93 BM ?

(At. no. V = 23; Cr = 24; Mn = 25; Fe = 26)

  • Mn2+

  • Fe2+

  • Cr2+

  • V3+


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145.

Identify the correct statement from below, concerning the structure of CH2 = C = CH2

  • The molecule is planar

  • One of the three carbon atoms is in an sp3 hybridized state

  • The molecule is non-planar with the two -CH2 groups being in planes perpendicular to each other

  • All the carbon atoms are sp-hybridized


146.

Molecular shapes of SF4, CF4, XeF4 are :

  • the same with 2, 0 and 1 lone pair of electron respectively

  • the same with 1, 1 and 1 lone pair of electrons respectively

  • different with 0, 1 and 2 lone pair of electrons respectively

  • different with 1, 0 and 2 lone pair of electrons respectively


147.

The presence of Ag+ ion increases the solubility of alkenes due to the formation of :

  • dπ-dσ bonding

  • pσ-pπ bonding

  • pπ- bonding

  • None of the above


148.

Each B - H - B bridge in B2H6 is formed by the sharing of:

  • 2 electrons

  • 4 electrons

  • 1 electron

  • 3 electrons


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149.

If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12 D (debye), but the experimental value of dipole moment was 1.03 D. Calculate the percentage ionic character :

  • 17

  • 83

  • 50

  • Zero


150.

Which one of the following molecules has the smallest bond angle ?

  • NH3

  • PH3

  • H2O

  • H2Se


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