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Question
Calcium oxide and phosphorous pentoxide are very good drying agents but they are not used to dry HCI gas. Give reasons for each.
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Solution
Calcium oxide and phosphorous pentoxide are very good drying agents but they are not used to dry HCI gas because they react with hydrogen chloride.
Cao +2HCI → CaCl2 +H2O
2P2O5 + 3HCl → POCl3 + 3HPO3
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