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What is the strength of nitric acid used in the manufacture of nitro phosphates?

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What is the strength of nitric acid used in the manufacture of nitro phosphates?

(a) 25-40%

(b) 10-15%

(c) 50-60%

(d) 5-10%

I have been asked this question in an interview for internship.

Origin of the question is Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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The correct option is (a) 25-40%

To explain: The strength of nitric acid used is 25-40% and the chemical reaction is completed in the ammoniating tank to which the digested slurry is pumped.

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