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Twelfth Grade (Grade 12) Molecules and Compounds Questions

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Grade 12 Molecules and Compounds
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]
Grade 12 Molecules and Compounds
According to VSEPR theory, what is the bond angle of compounds which are octahedral in shape?
  1. 180[math]deg[/math]
  2. 120[math]deg[/math]
  3. 90[math]deg[/math]
  4. 72[math]deg[/math]
Grade 12 Molecules and Compounds
How many grams of NaOH molecules are present in 1 mole of NaOH?
  1. 40 gms of NaOH molecules
  2. 50 gms of NaOH molecules
  3. 60 gms of NaOH molecules
  4. 70 gms of NaOH molecules
Grade 12 Molecules and Compounds
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
Grade 12 Molecules and Compounds
What is the shape of [math]SF_6[/math] molecule?
  1. Linear
  2. Trigonal planar
  3. Tetrahedral
  4. Octahedral
Grade 12 Molecules and Compounds
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
Grade 12 Molecules and Compounds
What hybridization does Chlorine trifluoride [math]ClF_3[/math] molecule 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]
Grade 12 Molecules and Compounds
Which of the following molecules has distorted tetrahedral shape?
  1. Ammonia molecule
  2. Chlorine trifluoride
  3. Dichloroiodate ion
  4. Bromine pentafluoride
Grade 12 Molecules and Compounds
Which of the following compounds has a linear shape?
  1. [math]BeF_2[/math]
  2. [math]BF_3[/math]
  3. [math]CH_4[/math]
  4. [math]SF_6[/math]
Grade 12 Molecules and Compounds
What is the experimentally observed bond angle of water molecule?
  1. [math]104.5deg[/math]
  2. [math]90deg[/math]
  3. [math]120deg[/math]
  4. [math]72deg[/math]
Grade 12 Molecules and Compounds
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
Grade 12 Molecules and Compounds
Which of the following chemical formulae represent Feldspar, the most important mineral of silicon?
  1. [math]K_2O•Al_2O_3•6H_2O[/math]
  2. [math]K_2O•3Al_2O_3•5 SiO_2[/math]
  3. [math]K_2O_3•2Al_2O_3•4SiO_2[/math]
  4. [math]K_2O•2Al_2O_3•3SiO_2[/math]
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