First slide

Water and Heavy water

Question

Correct order of boiling point is

Easy

A

H₂ > H₂O₂> D₂O > H₂O > D₂
B

H₂O₂ > H₂ > D₂O > H₂O > D₂
C

H₂O₂ > D₂O > H₂O > D₂ > H₂
D

H₂O₂ > D₂O > H₂O > H₂ > D₂

Solution

$\\\\SIZE\;\underrightarrow {\;{H_2}{O_2}\; > {D_2}O\; > \;{H_2}O\; > \;{D_2}\; > \;{H_2}\;\;}\\\\MWT\;\underrightarrow {\;\;34\;\;\;\;\;\;\;\;\;\;20\;\;\;\;\;\;\;\;\;\;18\;\;\;\;\;\;\;\;\;\;\;4\;\;\;\;\;\;\;\;\;\;2\;\;\;}\$
As the molecular weight [size] ↓_es the surface area of the molecule ↓_es and Hence Intermolecular attraction force ↓_es
Therefore the amount of energy (heat) required to break up those attraction forces ↓_es, i.e., the boiling point ↓_es
NOTE: Each molecule of H₂O₂,D₂O,H₂O₂ forms four hydrogen bond but their size order is
$\xrightarrow[\begin{subarray} \color{black} As\;the\;size\; \downarrow es, \\ I.M.F\; \downarrow es, \\ \therefore \,BPt\;\; \downarrow es \end{subarray} ]{{\;\;{H_2}{O_2}\; > {D_2}O\; > \;{H_2}O\;\;}}$

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