General
✓✗Assertion: Ice has a lower density than liquid water.
Reason: In ice, each water molecule is hydrogen-bonded to four others in an open tetrahedral arrangement.
Reason: In ice, each water molecule is hydrogen-bonded to four others in an open tetrahedral arrangement.
- 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 HOMO of O2 is
- π2p
- σ*2pz
- σ2pz
- π*2p (doubly degenerate, singly occupied)
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
✓✗Match List I with List II.
Choose the correct answer from the options given below:
| List I | List II |
| P. PCl5 | I. Square pyramidal |
| Q. SF6 | II. Trigonal planar |
| R. BrF5 | III. Octahedral |
| S. BF3 | IV. Trigonal bipyramidal |
- P-II, Q-III, R-IV, S-I
- P-IV, Q-III, R-I, S-II
- P-III, Q-I, R-IV, S-II
- P-IV, Q-III, R-II, S-I
General
✓✗Which two ions from the list NO2−, NO3−, NH2−, NH4+ and SCN− have geometries explained by the same hybridisation of orbitals?
- NO2− and NO3−
- NO2− and NH2−
- SCN− and NH2−
- NH4+ and NO3−
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
✓✗Which of the following pairs have the same shape?
- BF3 and ClF3
- XeF4 and CCl4
- ClF2− and XeF2
- SF4 and CF4
General
✓✗Match List I with List II.
Choose the correct answer from the options given below:
| List I (Molecule) | List II (Bond enthalpy, kJ mol−1) |
| P. HCl | I. 435.8 |
| Q. N2 | II. 498 |
| R. H2 | III. 946.0 |
| S. O2 | IV. 431.0 |
- P-IV, Q-III, R-II, S-I
- P-IV, Q-I, R-III, S-II
- P-IV, Q-III, R-I, S-II
- P-III, Q-IV, R-I, S-II
General
✓✗The shape of BrF4− is
- square planar
- square pyramidal
- see-saw
- tetrahedral
General
✓✗Which of the following does not exist according to MO theory?
- He2+
- Ne2
- Li2
- B2
General
✓✗Which of the following statements about resonance is correct?
- The hybrid has the energy of the most stable canonical form.
- Canonical structures interconvert rapidly.
- The resonance hybrid is more stable than any single canonical structure.
- Resonance structures differ in the positions of atoms.
General
✓✗The correct order of energies of molecular orbitals of the N2 molecule is
- σ1s < σ*1s < σ2s < σ*2s < σ2pz < (π2px = π2py) < (π*2px = π*2py) < σ*2pz
- σ1s < σ*1s < σ2s < σ*2s < (π2px = π2py) < σ2pz < (π*2px = π*2py) < σ*2pz
- σ1s < σ*1s < σ2s < σ*2s < (π2px = π2py) < (π*2px = π*2py) < σ2pz < σ*2pz
- σ1s < σ*1s < σ2s < σ*2s < σ2pz < σ*2pz < (π2px = π2py) < (π*2px = π*2py)
General
✓✗The correct order of lattice enthalpy of the group 2 oxides is
- BaO > SrO > CaO > MgO
- CaO > MgO > BaO > SrO
- MgO = CaO = SrO = BaO
- MgO > CaO > SrO > BaO
General
✓✗Assertion: Glycerol is more viscous than ethanol.
Reason: Glycerol has three OH groups and forms extensive hydrogen bonds.
Reason: Glycerol has three OH groups and forms extensive hydrogen bonds.
- 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 correct order of bond dissociation enthalpy is
- N2+ > N2 > N22+
- N2 > N2+ > N22+
- N22+ > N2+ > N2
- N2 = N2+ = N22+