| 1 |
A molecule has two ions pairs and two bond pairs around the central atom. The shape of molecule is. |
- A. Linear
- B. Pyramidal
- C. Angular
- D. Tetrahedral
|
| 2 |
Molecule in which the distance between two carbon atoms in the largest is. |
- A. C2H6
- B. C2H4
- C. C2H2
- D. C6H6
|
| 3 |
BF3 has zero while NH3 has 1.49 D dipole moment because. |
- A. B is less electronegative than N
- B. F is more electronegative than N
- C. BF3 is pyramidal while NH3 is planar
- D. NH3 is pyramidal while BF3 is trigonal planar
|
| 4 |
The H - H Bond energy in KJ mole -1 is. |
- A. 346
- B. 436
- C. 463
- D. 336
|
| 5 |
Which statement is true about Na and Na+ |
- A. size of Na is greater than Na+
- B. Size of Na is smaller than Na+
- C. Both have equal size
- D. Both have same properties
|
| 6 |
Which of the following species has unpaired electrons in anti-bonding molecular orbitals |
- A. O<sub>2</sub><sup>+2</sup>
- B. N<sub>2</sub><sup>-2</sup>
- C. B<sub>2</sub>
- D. F<sub>2</sub>
|
| 7 |
Which of the following is a polar molecule |
- A. CCl4
- B. HCl
- C. BF3
- D. CO2
|
| 8 |
Those elements whose electronegativities are 1.2 and 3.2, react to form |
- A. Ionic bond
- B. Covalent bond
- C. Gaseous substance
- D. Definiting a liquid substance
|
| 9 |
Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5<sup>o</sup> and 107.5 <sup>o</sup> respectively. This deviation is due to. |
- A. Hydrogen bonding in ammonia
- B. Lone pair attraction
- C. Lone pair occupy more space and repel to other bond pairs
- D. Lone pair lone pair repulsion
|
| 10 |
Which of the following molecule obey octet rule. |
- A. BF3
- B. BCl3
- C. NH2
- D. SF6
|