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Phosphates are prepared by the reaction of what?

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Phosphates are prepared by the reaction of what?

(a) Phosphorus pentachloride

(b) Phosphorus oxychloride

(c) Phosphorus pentachloride & oxychloride

(d) None of the mentioned

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This intriguing question comes from Esters of Inorganic Acids topic in portion Esterification of Unit Processes

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Right answer is (c) Phosphorus pentachloride & oxychloride

For explanation: Phosphates are prepared by the reaction of phosphorus pentachloride or phosphorus oxychloride with the appropriate alcohol or phenol.

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