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PART - 1 CH - 4 Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 4 Chemical Bonding and Molecular Structure2 Marks
Question
Give reason of following :
(a) HF is a liquid while HCl is gas.
(b) In $C _2 H _5 OH$ and $CH _3 COOH$ covalent bond is present, still it is soluble in water.
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Answer

(a) In HF strong intermolecular H-bond is present and they get attracted by them and comes
closer to each other. Hence it is a liquid while in HCl molecules weak Van der Waals force is present. Hence it is gas.
(b) $C _2 H _5 OH$ and $CH _3 COOH$ are polar. Hence they form H -bond with water. Therefore they are soluble in $H _2 O$.

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