General
✓✗When O2 is converted into O22−,
- the bond order decreases from 2 to 1 and the species becomes diamagnetic
- the bond order increases and the species becomes paramagnetic
- the magnetic behaviour does not change
- the bond length decreases
General
✓✗The number of resonance structures that can be drawn for ozone is
- 3
- 2
- 1
- 4
General
✓✗Which of the following is an odd-electron molecule?
- NO
- N2
- O3
- CO
General
✓✗The number of valence electrons in a nitrogen atom, shown as dots in its Lewis symbol, is
- 5
- 2
- 7
- 3
General
✓✗Among ClF3, SF4, XeF2 and PCl5, the species having exactly two lone pairs on the central atom is
- SF4
- PCl5
- XeF2
- ClF3
General
✓✗Which of the following molecules has a T-shape?
- BF3
- BrF3
- PCl3
- NH3
General
✓✗Assertion: The bond angle in NH3 is less than 109°28′.
Reason: The lone pair on N repels the bond pairs more strongly than they repel each other.
Reason: The lone pair on N repels the bond pairs more strongly than they repel each other.
- 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
✓✗Which of the following species has the same number of valence electrons as CO2?
- O3
- SO2
- NO2
- N3−
General
✓✗Free rotation is possible about
- a C≡C triple bond
- both double and triple bonds
- a C−C single bond
- a C=C double bond
General
✓✗The percentage s-character in an sp2 hybrid orbital is
- 50%
- 33.3%
- 75%
- 25%
General
✓✗The hydrogen bond between two water molecules is an example of
- intermolecular hydrogen bonding
- intramolecular hydrogen bonding
- covalent bonding
- metallic bonding
General
✓✗The magnetic moments (spin-only) of O2 and O2− are respectively
- 2.83 BM and 1.73 BM
- 1.73 BM and 2.83 BM
- 0 and 1.73 BM
- 2.83 BM and 0
General
✓✗The total number of electrons in antibonding molecular orbitals of O2− (including 1s) is
- 5
- 7
- 3
- 9
General
✓✗In which of the following molecules is the central atom both sp3 hybridised and the molecule polar?
- SO42−
- NH3
- CCl4
- CH4
General
✓✗Statement I: C2 contains a double bond made of two π bonds.
Statement II: C22− has a bond order of 3.
Statement II: C22− has a bond order of 3.
- 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