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Which of the following is not a component of ascu?

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Which of the following is not a component of ascu?

(a) Arsenic pentoxide

(b) Arsenic sulphate

(c) Copper sulphate

(d) Potassium dichromate

This question was posed to me by my college professor while I was bunking the class.

Asked question is from Timber Partitions in division Cavity Walls & Partition Walls of Construction & Building Materials

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The correct answer is (b) Arsenic sulphate

The best I can explain: Ascu is a preservative that is used for the preservation of timber in order to prevent the timber from decaying. It contains arsenic pentoxide, copper sulphate and potassium dichromate. Ascu is available in powder form.

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