InterviewSolution
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InterviewSolution
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(a)Explain the disadvantage of P_2O_5 as a drying agent though it is known to be a good desiccant. (b)How can P_2O_5 be used in the preparation of SO_3 ? |
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Answer» Solution :(a) `P_2O_5` is a solid and is a good desiccant since it can absorb moisture form other SUBSTANCES. However, on absorbing moisture, `P_2O_5` forms `H_3PO_4` which forms a layer on the surface. As a result of this desiccating ability decreases and hence, its use for dryiny in limited. (b) `P_2O` is a STRONG dehydrating agent and hence, REMOVES water moleucles form inorganic COMPOUNDS. `H_2SO_4` and `HNO_3` are CONVERTED into their corresponding anhydride : `2H_2SO_4+P_4O_10to 2SO_3+4HPO_3` |
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