What is the significance of S-S bond?
Sulphur-sulphur bond is important in biological system. Many compounds such as cistern and many proteins and enzymes contain S-S bond.
Why is sulphur solid whereas oxygen is a gas at room temperature?
Due to the very small size of oxygen, it can form a diatomic molecule by p-pbonding. On the other band. Sulphur is larger in size and cannot form -bond by lateral overlapping of orbitals. Due to big size, sulphur can form puckered structure and exist as a solid.
Why OF6 is not formed whereas SF6 is formed?
OF6 is not formed because of the absence of d-orbital in oxygen atom.
What do you say about the acidic character of the oxides of sulphur?
The acidic character of the oxide of sulphur increases with the increases in the oxidation number of sulphur. 
Why SF6 is formed whereas SH6 is unknown?
The reason is that fluorine is highly electronegative and can promote electron from 3s and 3p orbital’s making available six half filled orbital’s. But hydrogen is less electronegative and cannot promote electrons. Similarly PCl5 is formed but PH5 is not.
Explain how SOCl2 can act as weak Lewis base as well as weak Lewis acid?
In SOCl2, sulphur carries a lone pair of electrons which it can donate and thus acts as Lewis base. Also SOCl2 contains empty d-orbital’s which can accommodate electron pairs and thus can also act as weak Lewis acid.
For dilution of H2SO4, water should not be added in conc-H2SO4.
Conc.H2SO4 has greater affinity for water molecules. During addition of water, large amount of heat energy is released. Tempe ration rises suddenly and bumping takes place. To avoid an accident, acid should be added to water with constant stirring.
Concentrated H2SO4 cannot be used for drying H2. Explain.
The reason that hydrogen, sometimes ignites due to the large amount of heat released when water is absorbed by acid.
H2S is a strong acid than water. Explain.
The reason is that H-S bond is weaker than H-O bond and the proton is more easily reduced when H2S reacts with water.
What happens when sulphur is dissolved in Oleum?
Sulphur dissolves in oleum to give clear brightly coloured solutions containing polyatomic sulphur cations of general formula, Sn2+. The bright yellow colour contains S42+. Deep blue colour is due to S82+ion.
What is tailing of mercury?
When comes in contact with ozone, mercury loses its mobility and sticks to glass due to the formation of mercurous oxide. It is called t ailing of mercury.
                                       2Hg+O2žHg2O+O2
Which oxide of oxygen family is amphoteric in nature?
TeO2 is amphoteric in nature.
Ozone layer in the upper regions of atmosphere protects earth from the harmful radiation of sun. Explain.
Harmful radiations are emitted by sun. The ozone layer is capable of absorbing these radiations and thus, protects the earth from these radiations.



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