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Fertiliser Technology

Q1: Pick out the wrong statement.

A 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid.

B Chemically unreactive nature of red phosphorous is due to its polymeric structure.

C Red phosphorous is the most reactive allotropic form of phosphorous.

D Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation.

ANS:C - Red phosphorous is the most reactive allotropic form of phosphorous.

The wrong statement is: "Red phosphorus is the most reactive allotropic form of phosphorus." In reality, red phosphorus is the less reactive form of phosphorus compared to white phosphorus. White phosphorus is highly reactive and pyrophoric, meaning it can ignite spontaneously in air at room temperature. In contrast, red phosphorus is much less reactive and is stable under normal conditions. This is why red phosphorus is commonly used in safety matches and other applications where a less reactive form of phosphorus is desired. Therefore, the statement suggesting red phosphorus as the most reactive allotropic form of phosphorus is incorrect.



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