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JEE Main202125 Feb 2021Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Given below are two statements: Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. In the light of the above statements, choose the correct answer from the options given below:

Options

  1. ABoth Statement I and Statement II are true.
  2. BStatement I is true but Statement II is false.
  3. CStatement I is false but Statement II is true.
  4. DBoth Statement I and Statement II are false.

Correct answer

B. Statement I is true but Statement II is false.

Step-by-step solution

α - sulphur ⇌ < 369 K > 369 K β - sulphur at room temperature α -sulphur (Rhombic) is most stable form. The most stable allotropic form of sulphur is Rhombic sulphur. Since both rhombic and monoclinic are nonpolar in nature so, they are soluble in non-polar solvents like carbon disulphide (CS 2 ​). Both rhombic and monoclinic sulphur has the molecular formula S 8 .​

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