In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Sulphur present in an organic compound can be estimated quantitatively by Carious method.

 Reason (R): Sulphur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid.

(i) Both A and R are correct, and R is the correct explanation of A.

(ii) Both A and R are correct, but R is not the correct explanation of A.

(iii) Both A and R are not correct.

(iv) A is not correct but R is correct.

Answers (1)

The answer is the option (iii) Both A and R are not correct.

Explanation: Sulphur is estimated by the Carius method in the form of white precipitate of BaSO_{4} on heating with fuming and BaCl_{2}. If light yellow solid is obtained it means that impurities are present. It is then filtered, washed, and then dried to get pure BaSO_{4}.

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