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JEE Main 202125 FebruaryEvening Shift
Exam
JEE Main
Year
2021
Date
25 February
Shift
Evening Shift
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2021 · 25 February · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Given below are two statements: Statement I : α and β forms of...

Given below are two statements:

Statement I : α\alpha and β\beta 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 II and Statement IIII are true.
  2. BStatement II is true but Statement IIII is false.
  3. CStatement II is false but Statement IIII is true.
  4. DBoth Statement II and Statement IIII are false.

Correct answer

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

Step-by-step solution

α−sulphur⇌369Kβ−sulphur\alpha - sulphur\mathop{⇌}_{ 369K}\beta - sulphur

at room temperature α\alpha-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 (CS2​).
Both rhombic and monoclinic sulphur has the molecular formula S8.​

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