Multiple choice question

iz'u&31 gkbMªkstu cU/k ds dkj.k ;kSfxdksa ds DoFkukadks ,oa nzo.kkadks ij iM+us okys
izHkko dks Li"V djrs gq, cQZ dk ?kuRo ty ls de gksus ds dkj.k dks Li"V
dhft;s\
How does hydrogen bond affects the boiling point and melting point of
compounds and also explain why density of ice is less than water.
iz'u&32 fuEu dks dkj.k lfgr Li"V djks\
(a) HF nzo gS] tcfd HCl xSl\ (b) H 2 O nzo gS] tcfd H 2 S xSl\
(c) 4°C ij ty dk ?kuRo vf/kdre D;ksa gksrk gS\
(d) ,fFky vYdksgy dh rqyuk esa fXyljkWy dh ';kurk vf/kd D;ksa gS\
Explain the following with reasons–
(a) HF is a liquid, while HCl is a gas (b) H 2 O is liquid, while H 2 S is a gas
(c) Density of water is maximum at 4°C
(d) The viscocity of glycerol is greater than C 2 H 5 OH
iz'u&33 fuEu ds dkj.k Li"V dhft;s\
1- HF dk gkbMªkstu cU/k H O ls 'kfDr'kkyh gS fQj Hkh H O dk DoFkukad HF
2 2
ls vf/kd gksrk gSA
2- O rFkk Cl nksuksa dh gh fo|qr _.krk ,d leku gS fQj Hkh O ds lkFk
gkbMªkstu cU/k curk gS] fdUrq Cl ;g cU/k ugh cukrkA
3- NaCl ty esa 'kh?kz foys; gksrk gS] tcfd LiCl ty esa vYi foys; gksrk gSA
Explain the following with reactions–
1. Hydrogen bond in H–F is stronger than H 2 O, even than boiling point of H 2 O
is higher than HF
2. O and Cl have same electro (–)ve character but O forms hydrogen bond while
Cl does not.
3. NaCl is readily soluble in water in comparison to LiCl which is less soluble
in water
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