General
✓✗Which of the following bonds will be the most polar?
- N−F
- N−Cl
- O−F
- N−N
General
✓✗Identify the incorrect statement about PCl5.
- PCl5 possesses two different Cl−P−Cl bond angles.
- PCl5 consists of five P−Cl (sigma) bonds.
- PCl5 exhibits sp3d hybridisation.
- All five P−Cl bonds are identical in length.
General
✓✗The HOMO of N2 is
- π*2px
- σ2pz
- σ*2s
- π2px
General
✓✗Assertion: He2 does not exist.
Reason: The numbers of bonding and antibonding electrons in He2 are equal.
Reason: The numbers of bonding and antibonding electrons in He2 are equal.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗The dipole moment of H2O is 1.85 D and the H−O−H angle is 104.5°. The O−H bond moment is about (cos 52.25° = 0.612)
- 3.70 D
- 1.85 D
- 0.93 D
- 1.51 D
General
✓✗The table below gives the bond dissociation energies (Ediss) for single covalent bonds of carbon atoms with four elements W, X, Y and Z.
Which element has the smallest atoms?
| Bond | Ediss (kJ mol−1) |
| C−W | 240 |
| C−X | 328 |
| C−Y | 276 |
| C−Z | 485 |
- Y
- Z
- X
- W
General
✓✗Which of the following species is paramagnetic?
- NO
- O22−
- CO
- CN−
General
✓✗In which of the following is the bond angle maximum?
- SCl2
- PCl3
- NH3
- NH4+
General
✓✗In X−H···Y, X and Y are both electronegative elements. Then
- electron density on both will decrease
- electron density on both will increase
- electron density on X will increase and on H will decrease
- electron density on X will decrease and on H will increase
General
✓✗Which of the following species has a bond order of 3?
- NO
- O2+
- N2−
- NO+
General
✓✗Consider the C−H bonds marked in the following compounds: I. a C−H bond of benzene; II. the terminal ≡C−H bond of phenylacetylene (C6H5C≡C−H); III. a C−H bond of cyclopropane. The correct order of the bond dissociation energy of these C−H bonds is
- I > II > III
- II > III > I
- II > I > III
- III > II > I
General
✓✗Statement I: The C−O bond in CO2 is longer than that in CO.
Statement II: The C−O bond in CO32− is shorter than that in CO2.
Statement II: The C−O bond in CO32− is shorter than that in CO2.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗The shape of XeOF4 is
- square pyramidal
- see-saw
- trigonal bipyramidal
- octahedral
General
✓✗The bond angle between sp hybrid orbitals is
- 109°28′
- 180°
- 90°
- 120°
General
✓✗Which of the following is an odd-electron molecule?
- NO
- N2
- O3
- CO