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Acid free grade of tri chloro ethylene is known as _______________

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Acid free grade of tri chloro ethylene is known as _______________

(a) Extraction

(b) Technical

(c) Industrial

(d) Tri-chlor

I have been asked this question during an online exam.

My question is taken from C1 Compounds topic in chapter Synthetic Organic Chemical Industries of Chemical Technology

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Correct option is (d) Tri-chlor

For explanation I would say: Acid free grade of tri chloro ethylene is known as tri-chlor whereas high purity grade is called technical grade and non-acid grade is called extraction grade, industrial grade is not present.

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