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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
MCQ
Note : 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 Carius method.
Reason $(R)$ : Sulphur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid.
  • A
    Both $A$ and $R$ are correct and $R$ is the correct explanation of $A.$
  • B
    Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A.$
  • ✓
    Both $A$ and $R$ are not correct.
  • D
    $A$ is not correct but $R$ is correct.
✓

Answer

Correct option: C.
Both $A$ and $R$ are not correct.
Sulphur is estimated by Carius method in the form of white precipitate of $\mathrm{BaSO}_4$ on heating with fuming and $\mathrm{BaCl}_2$. If light yellow solid is obtained means impurities are present. It is filtered washed and then dried to get pure $\mathrm{BaSO}_4$.

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