NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- States of Matter
NTA Abhyas 2020 · Chemistry · States of Matter
The qualitative sketches I, II and III given below show the...
The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl, \text{C}{\text{H}_{3}\text{OH} and \text{C}{\text{H}_{3} ( \text{C}{\text{H}_{2}{)}_{\text{11}}\text{OS}{\text{O}_{3}^{-}\text{N}{\texta^{+} at room temperature. The correct assignment of the sketches is
Options
- AI. ;
II.\text{C}{\text{H}_{3}\text{OH} ;
III.\text{C}{\text{H}_{3}{\left(\text{C}{\text{H}_{2}\right)}_{11}\text{O}\text{S}{\text{O}_{3}^{-}\text{N}{\texta^{+} - BI.III.\text{C}{\text{H}_{3}{\left(\text{C}{\text{H}_{2}\right)}_{11}\text{O}\text{S}{\text{O}_{3}^{-}\text{N}{\texta^{+} ;
II.\text{C}{\text{H}_{3}\text{OH} ;
III. - CI. ;
II.\text{C}{\text{H}_{3} ( \text{C}{\text{H}_{2}{)}_{\text{11}}OS{O}_{3}^{-}Na^{+} ;
III.\text{C}{\text{H}_{3}\text{OH} - DI.\text{C}{\text{H}_{3}\text{OH} ;
II. ;
III.\text{C}{\text{H}_{3}{\left(\text{C}{\text{H}_{2}\right)}_{11}\text{O}\text{S}{\text{O}_{3}^{-}\text{N}{\texta^{+}
Correct answer
D. I.\text{C}{\text{H}_{3}\text{OH} ;
II. ;
III.\text{C}{\text{H}_{3}{\left(\text{C}{\text{H}_{2}\right)}_{11}\text{O}\text{S}{\text{O}_{3}^{-}\text{N}{\texta^{+}
Step-by-step solution
Impurities affect surface tension appreciably. It is observed that impurities which tend to concentrate on surface of liquids, compared to its bulk lower the surface tension.
Substances like detergents and soaps \left[{\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{11} {\text{SO} }_{3}^{−} {\text{Na}}^{+}\right]decrease\text{C}{\text{H}_{3}\text{OH}, {C}_{2}{H}_{5}\text{OH} )lower\text{KCl} tend to increase the surface tension of water.
Substances like detergents and soaps \left[{\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{11} {\text{SO} }_{3}^{−} {\text{Na}}^{+}\right]decrease\text{C}{\text{H}_{3}\text{OH}, {C}_{2}{H}_{5}\text{OH} )lower\text{KCl} tend to increase the surface tension of water.