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Molecules (Grades 11-12)

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According to VSEPR theory, what is the bond angle of compounds that are octahedral in shape?
  1. 180[math]deg[/math]
  2. 120[math]deg[/math]
  3. 90[math]deg[/math]
  4. 72[math]deg[/math]
According to VSEPR theory, what is the order in which repulsions between electron pairs decreases?
  1. lone pair-lone pair> lone pair-bond pair> bond pair-bond pair
  2. lone pair-lone pair> bond pair-bond pair>lone pair-bond pair
  3. bond pair-bond pair>lone pair-bond pair>lone pair-lone pair
  4. lone pair-bond pair>lone pair-lone pair>bond pair-bond pair
Which of the following parameters increases with a decrease in the size of a bonding pair of electrons?
  1. Electronegativity
  2. Ionization potential
  3. Hydration energy
  4. Solvation energy
Which of the following molecules has a distorted tetrahedral shape?
  1. Ammonia molecule
  2. Chlorine trifluoride
  3. Dichloroiodate ion
  4. Bromine pentafluoride
What can you predict according to VSEPR theory, provided you know the distribution of orbitals containing electronic pairs around the central atom?
  1. shape of the molecule and bond angle
  2. heat of formation of molecule
  3. solvation energy of molecule
  4. lattic energy of molecule
What hybridization does chlorine trifluoride undergo?
  1. [math]sp^3d[/math]
  2. [math]sp^2[/math]
  3. [math]sp^3d^3[/math]
  4. [math]sp^3d^2[/math][math][/math]
Who proposed the VSEPR theory for the first time in 1940?
  1. Sidgwick and Powell
  2. A.F. Kapustinskii
  3. M. Born and F.Haber
  4. Van der Waals
Which of the following molecules is linear in shape?
  1. [math]BeCl_2[/math]
  2. [math]CH_4[/math]
  3. [math]H_2O[/math]
  4. [math]NH_3[/math]
What is the experimentally observed bond angle of a water molecule?
  1. [math]104.5deg[/math]
  2. [math]90deg[/math]
  3. [math]120deg[/math]
  4. [math]72deg[/math]
The presence of lone pair in [math]IF_5[/math] molecule distorts its shape from                                            to                                   .

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