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(i) Explain O_2is gas and sulphur is solid.(ii) Give the reaction of O_3with (a) PbS (b) Acidified FeSO_4and (c ) Hg. |
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Answer» SOLUTION :(i) Oxygen atom has small size. It can form multiple bonds and exists as `O_2`molecule. `O_2`molecules are HELD together by weak van der Waals. forces of attraction. ` THEREFORE ` it has low b.pt. and is GAS at ROOM temperature. S atom has large size, it forms single bonds and exists as `S_8`molecules. In these `S_8`molecules the magnitude of van der Waals. forces of attraction is large . it has high m.pt. and is solid at room temperature.  
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