Multiple Choice QuestionsInoic bonds are usually formed by combination of elements with
high ionisation potential and low electron affinity
low ionisation potential and high electron affinity
high ionisation potential and high electron affinity
low ionisation potential and low electron affinity
The angle between two covalent bonds is maximum in
CH4
H2O
CO2
SO2
C.
CO2
Number of molecular hybrid orbitals = number of sigma bonds + number of lone pair of electrons.
| No. of molecular hybrid orbital | Hybridization | Bond angle |
| 2 | sp | 180° |
| 3 | sp2 | 120° |
| 4 | sp3 | 190°28' |
Dot structure CH4
Number ofmolecular hybrid orbitals = number of sigma bonds + number of lone pairs of electrons = 4+0.
∴ Number of molecular hybrid orbitals = 4
Hence, hybridisation = sp3
Bond angle= 109°28'
Dot structure of H2O
∴ Number of molecular hybrid orbitals = 2+ 2 = 4
Hence, hybridisation = sp3
Bond angle = 104. 5°
The lone pairs repel the bond pairs, thereby decreasing the bond angle.
Dot structure of CO2
O=C=O
∴ Number of molecular hybrid orbitals = 2
Hence, hybridisation = sp
bond angle = 180°
Dot structure of SO2
O←=O
∴ Number of molecular hybrid orbitals = 2+1= 3
Hence, hybridisation = sp2
bond angle = 120°
If a molecule MX3 has zero dipole moment, the sigma bonding orbital used by M (At. no. 13) are
pure p
sp- hybridised
sp2- hybridised
sp3- hybridised
The molarity of a solution made by mixing 50mL of conc. H2SO4 (36N) with 50mL of water, is
36M
18M
9M
6M
171g of sugar cane (C12H22O11) is dissolved in 1 L of water. The molarity of the solution is
2.0 M
1.0 M
0.5 M
0.25 M
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