General
✓✗Which molecule has a see-saw shape?
- SiCl4
- XeF4
- CCl4
- TeCl4
General
✓✗The melting points of the group 15 hydrides follow the order
- NH3 > SbH3 > AsH3 > PH3
- AsH3 > NH3 > PH3 > SbH3
- SbH3 > AsH3 > PH3 > NH3
- PH3 > AsH3 > SbH3 > NH3
General
✓✗Which of the following is a non-polar molecule?
- PCl3
- SF4
- PCl5
- NH3
General
✓✗Assertion: Nitrogen is a gas whereas phosphorus is a solid at room temperature.
Reason: Nitrogen forms discrete N2 molecules held by weak van der Waals forces, while phosphorus forms larger P4 molecules or polymeric structures.
Reason: Nitrogen forms discrete N2 molecules held by weak van der Waals forces, while phosphorus forms larger P4 molecules or polymeric 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
✓✗Which of the following species has four lone pairs of electrons?
- O
- He
- I
- Cl−
General
✓✗In the nitrite ion, NO2−, the shape and hybridisation of N are
- linear, sp
- bent, sp2
- bent, sp3
- trigonal planar, sp2
General
✓✗Bleaching powder reacts with a few drops of concentrated HCl to give
- calcium oxide
- hypochlorous acid
- chlorine
- oxygen
General
✓✗The general valence shell electronic configuration of group 15 elements is
- ns2 np2
- ns2 np4
- ns2 np3
- ns2 np5
General
✓✗Assertion: PCl5 is more covalent than PCl3.
Reason: P in the +5 oxidation state has a higher polarising power than P in the +3 state.
Reason: P in the +5 oxidation state has a higher polarising power than P in the +3 state.
- 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
✓✗Among the group 16 elements, which one does not show the −2 oxidation state?
- Se
- Te
- O
- Po
General
✓✗Which of the following has the highest first ionisation enthalpy?
- N
- P
- O
- S
General
✓✗The single N−N bond is weaker than the single P−P bond because
- N has d orbitals
- of strong repulsion between the lone pairs of the small N atoms
- the N−N bond is long
- N is larger than P
General
✓✗The correct order of acidic strength of the oxides of nitrogen is
- N2O5 < N2O3 < NO < N2O
- NO < N2O < N2O5 < N2O3
- N2O3 < N2O5 < N2O < NO
- N2O < NO < N2O3 < N2O5
General
✓✗Which hydrogen halide is the strongest acid in water?
- HI
- HBr
- HCl
- HF
General
✓✗The shape of NO3− is
- pyramidal
- T-shaped
- tetrahedral
- trigonal planar