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Free download in PDF Class 12 Chemistry Chapter 5 Surface Chemistry Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
Which of the following is reversible sol ?
[A]
Cellulose
[B]
Mist
[C]
Gelatin
[D]
none
(2)
Which type of sol sulphar is ?
[A]
Multimolecular colloid
[B]
Micelle
[C]
Associated colloid
[D]
Macromolecular colloid
Answer: Multimolecular colloid
(3)
Which of the following is macromolecalar colloid ?
[A]
Artificial rubber
[B]
Protein
[C]
Nylon
[D]
All the given
(4)
What is called to that temperature at which the formation of micelle takes place ?
[A]
Zero temperature
[B]
Kraff temperatue
[C]
Kelvin temperature
[D]
Absolute temperature
(5)
At which condition micelle is formed ?
[A]
At concentration higher then critical micelle concentration and lower then kraft temperature
[B]
At concentration higher then critical micelle concentration and higher then kraft temperature
[C]
At concentration lower then critical micelle concentration and lower then kraft temperature
[D]
At concentration lower then critical micelle concentration and higher then kraft temperature
Answer: At concentration higher then critical micelle concentration and higher then kraft temperature
(6)
In which of the following method condensation and dispersion are associated ?
[A]
Excessive cooling
[B]
Hydrolysis
[C]
Bredig’s are
[D]
Peptization
(7)
Which method is is used to obtain sol of gold and silver ?
[A]
Electric dispersion
[B]
Peptization
[C]
Excessive cooling
[D]
Mechanical dispersion
Answer: Electric dispersion
(8)
Whose menbranes are used in dialysis ?
[A]
Parchment paper
[B]
Plastic
[C]
Filter paper
[D]
Ultrafilter paper
(9)
___Phenomenon is called reverse to coagulation ?
[A]
Flocculation
[B]
Tyndall
[C]
Brownian
[D]
Dialysis
(10)
By the use of which colligative property molecularmass of colloid can be determine ?
[A]
Decrease in vapour pressure
[B]
Elevation in boiling point
[C]
Depression infeezing point
[D]
Osmotic pressure
(11)
Which of the following is oil/water emulsion ?
[A]
Milk
[B]
Vanishing cream
[C]
Butter
[D]
All the given
(12)
Which of the following substance is used as stabilizer in emulsion ?
[A]
Protein
[B]
Gum
[C]
Agar
[D]
All the given
(13)
Tyndall effect is associated with which property of colloid ?
[A]
Mechanical
[B]
Colligative
[C]
Optical
[D]
Electrical
(14)
Which method is used for demulsification ?
[A]
Sulimation
[B]
DIstillation
[C]
Filtration
[D]
Centrifugation
(15)
Surface-tention of lyophobic sol is
[A]
less then water
[B]
greater then water
[C]
equal to water
[D]
can not be predict
(16)
For the preparation of which substances reversible micelle is used ?
[A]
Medicines
[B]
Nano products
[C]
Rubber plating
[D]
All the given
(17)
Tyndall effect is shown by
[A]
Ideal solution
[B]
Colloidal solution
[C]
Saturated solution
[D]
True solution
Answer: Saturated solution
(18)
Which of the following can prepare cationic micelle ?
[A]
Sodium stearate
[B]
Cetyltrimethyl ammonium bromide
[C]
Urea
[D]
Sodium dodesylsulphate
(19)
When the rate of physical adsorption will increase ?
[A]
By reducing pressure
[B]
By reducing temperature
[C]
By increasing temperature
[D]
(a) and (c)
Answer: By reducing pressure
(20)
According to the adsorption theory of catalysis, the speed of the reaction increases because
[A]
Adsorption produces heat which increases the speed of the reaction
[B]
Adsorption lowers the activation energy of the raction
[C]
The concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
[D]
In the process of adsorption, the activation energy of the molecules become large
Answer: Adsorption lowers the activation energy of the raction
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