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NEET 2024
Exam
NEET
Year
2024
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

NEET 2024 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Given below are two statements: Statement I: The boiling point of...

Given below are two statements: Statement I: The boiling point of hydrides of Group 16 elements follow the order H2O>H2Te>H2Se>H2 S\mathrm{H}_2 \mathrm{O}\gt\mathrm{H}_2 \mathrm{Te}\gt\mathrm{H}_2 \mathrm{Se}\gt\mathrm{H}_2 \mathrm{~S}. \text{. }StatementII:Onthebasisofmolecularmass,Statement II: On the basis of molecular mass,H2\mathrm{H}_2O\mathrm{O}isexpectedtohavelowerboilingpointthantheothermembersofthegroupbutduetothepresenceofextensiveH−bondinginis expected to have lower boiling point than the other members of the group but due to the presence of extensive H -bonding inH2O\mathrm{H}_2 \mathrm{O}, it has higher boiling point. 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 false
  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 true

Correct answer

D. Both Statement I and Statement II are true

Step-by-step solution

Statement I is correct, because boiling point of hydrides of group 16 follows the order H2O>H2Te>H2Se>H2 S\mathrm{H}_2 \mathrm{O}\gt\mathrm{H}_2 \mathrm{Te}\gt\mathrm{H}_2 \mathrm{Se}\gt\mathrm{H}_2 \mathrm{~S}. \text{. }StatementIIduetointermolecularH−bondingStatement II due to intermolecular H -bondingH2O\mathrm{H}_2 \mathrm{O} shows higher boiling point than respective hydrides of group 16. (Both Statement are true) Order from H2\mathrm{H}_2Te\mathrm{Te}totoH2 S\mathrm{H}_2 \mathrm{~S} is due to decreasing molar mass.
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