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The test tube in the determination of aniline number is made up of __________

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The test tube in the determination of aniline number is made up of __________

(a) Tempered glass

(b) Glass

(c) Heat resistant glass

(d) Heated glass

I got this question in an online quiz.

This key question is from Oxidation Stability and Aniline Number in division Lubricants of Applied Chemistry

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Best answer
Right option is (c) Heat resistant glass

The best explanation: The test tube is made with heat resistant glass. The cork is fitted to it. It is fitted with stirrer and thermometer for even mixing of the aniline in oil and to know the temperature.

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