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In the estimation of sulphur, the organic compound is heated with ___________ in a carius tube.

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in Chemistry – Class 11 by (148k points)
In the estimation of sulphur, the organic compound is heated with ___________ in a carius tube.

(a) sodium hydroxide

(b) sodium peroxide

(c) potassium hydroxide

(d) calcium chloride

I had been asked this question by my college director while I was bunking the class.

My question is taken from Organic Chemistry topic in portion Organic Chemistry – Basic Principles and Technique of Chemistry – Class 11

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The correct answer is (b) sodium peroxide

Easy explanation: In the estimation of sulphur, a known quantity of the organic compound is heated with sodium peroxide. This facilitates the sulphur present to be oxidized to sulphuric acid. It is precipitated as barium sulphate by adding excess of barium chloride solution in water. The percentage of sulphur can be estimated from the mass of barium sulphate.

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