General
✓✗The bond length between a hybridised carbon atom and another carbon atom is minimum in
- propane
- butane
- propene
- propyne
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 shape of XeOF4 is
- square pyramidal
- see-saw
- trigonal bipyramidal
- octahedral
General
✓✗In which of the following does the hybridisation of the central atom change on going from the first species to the second?
- BF3 → BF4−
- H2O → H3O+
- CH4 → CCl4
- NH3 → NH4+
General
✓✗As the bond order increases, the bond enthalpy
- remains the same
- decreases
- increases
- becomes zero
General
✓✗In which of the following molecules are all the bonds NOT equal?
- AlF3
- ClF3
- NF3
- BF3
General
✓✗Electrons in an antibonding molecular orbital
- increase the bond order
- have no effect
- increase the bond strength
- decrease the stability of the molecule
General
✓✗Assertion: All C−O bonds in CO32− are equal in length.
Reason: The CO32− ion is a resonance hybrid of three equivalent structures.
Reason: The CO32− ion is a resonance hybrid of three equivalent structures.
- 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
✓✗Statement I: The C−H bond in ethyne is shorter than that in ethane.
Statement II: The greater the s-character of the carbon hybrid orbital, the shorter the C−H bond.
Statement II: The greater the s-character of the carbon hybrid orbital, the shorter the C−H bond.
- 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
✓✗N2 and O2 are converted into the monoanions N2− and O2− respectively. Which of the following statements is wrong?
- In N2−, the N−N bond weakens.
- In O2−, the O−O bond order decreases.
- N2− becomes diamagnetic.
- In O2−, the bond length increases.
General
✓✗The shape of CH4 is
- trigonal planar
- tetrahedral
- square planar
- pyramidal
General
✓✗Assertion: XeF4 is square planar while SF4 is see-saw shaped.
Reason: Xe in XeF4 has two lone pairs while S in SF4 has one lone pair.
Reason: Xe in XeF4 has two lone pairs while S in SF4 has one lone pair.
- 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 HBr is 0.79 D and its bond length is 141 pm. The fraction of electronic charge on each atom is about (e = 4.8 × 10−10 esu, 1 D = 10−18 esu cm)
- 0.79
- 0.02
- 0.12
- 0.5
General
✓✗The number of resonance structures that can be drawn for ozone is
- 3
- 2
- 1
- 4
General
✓✗The number of 90° F−S−F angles in SF6 is
- 12
- 8
- 4
- 6