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Class 12 Exam  >  Class 12 Tests  >  Test Previous Year Questions (Level - 1): Surface Chemistry - Class 12 MCQ

Test Previous Year Questions (Level - 1): Surface Chemistry - Class 12 MCQ


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8 Questions MCQ Test - Test Previous Year Questions (Level - 1): Surface Chemistry

Test Previous Year Questions (Level - 1): Surface Chemistry for Class 12 2024 is part of Class 12 preparation. The Test Previous Year Questions (Level - 1): Surface Chemistry questions and answers have been prepared according to the Class 12 exam syllabus.The Test Previous Year Questions (Level - 1): Surface Chemistry MCQs are made for Class 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test Previous Year Questions (Level - 1): Surface Chemistry below.
Solutions of Test Previous Year Questions (Level - 1): Surface Chemistry questions in English are available as part of our course for Class 12 & Test Previous Year Questions (Level - 1): Surface Chemistry solutions in Hindi for Class 12 course. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free. Attempt Test Previous Year Questions (Level - 1): Surface Chemistry | 8 questions in 10 minutes | Mock test for Class 12 preparation | Free important questions MCQ to study for Class 12 Exam | Download free PDF with solutions
Test Previous Year Questions (Level - 1): Surface Chemistry - Question 1
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Adding alum to turbid water, impurties are removed due to -

 [AIEEE-2002]

Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 1

Turbid waters, containing colloidal particles, are normally treated by coagulation-flocculation followed by clarification. Generally, alum is the first coagulant of choice because of its lower cost and its widespread availability. The coagulation performance of Alum, an inorganic chemical coagulant was tested on synthetic high turbid water.

Results showed that coagulation process could remove turbidity effectively using relatively low levels of Alum.

Test Previous Year Questions (Level - 1): Surface Chemistry - Question 2
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Which one of the following characteristics is not correct for physical adsorption ?      

[AIEEE-2003]

Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 2

The correct answer is Option D.
Physical adsorption increases with decrease in temperature as  easily liquefiable gases can adsorb more.
So option D is a false statement.

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Test Previous Year Questions (Level - 1): Surface Chemistry - Question 3
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The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be –

 [AIEEE-2005]

Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 3

For a true solution, the diameter range is 1 to < 10 Angstrom, and for colloidal solution,diameter range is 10-1000 Angstrom.

Test Previous Year Questions (Level - 1): Surface Chemistry - Question 4
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The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively. Which of the following statements is not correct? 

[AIEEE-2005]
Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 4

The dispersed phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively.
When two solutions are mixed, they will affect mutual coagulation. This is because the charge on one sol is neutralized by the opposite charge on the other sol. Hence, statement A is not correct.
 

Test Previous Year Questions (Level - 1): Surface Chemistry - Question 5
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In Langmuir's model of adsorption of a gas on a solid surface –  

[AIEEE 2006]
Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 5

The correct answer is option B
According to Langmuir's adsorption isotherm, the mass of gas striking a given area of surface is proportional to the pressure of the gas as x/m​=k′p/​1+kp

Test Previous Year Questions (Level - 1): Surface Chemistry - Question 6
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Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is  

 [AIEEE 2008]
Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 6

The correct answer is option B
Gold numbers of protective colloids A,B,C and D are 0.50,0.01,0.10 and 0.005 respectively. The correct order of their protective powers is A(0.50)<C(0.10)<B(0.01)<D(0.005)
Higher is the value of gold number, lower is the protective power.
 

Test Previous Year Questions (Level - 1): Surface Chemistry - Question 7
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Which of the following statements is incorrect regarding physissorptions ?  

[AIEEE 2009]
Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 7

Physical adsorption is an exothermic process (i.e., ΔH = –ve) but its value is quite low because the attraction of gas molecules and solid surface is weak van der Waals forces.

Test Previous Year Questions (Level - 1): Surface Chemistry - Question 8
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The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order:  

[IIT Mains 2013]
Detailed Solution for Test Previous Year Questions (Level - 1): Surface Chemistry - Question 8

The correct is Option D.
According to Hardy Schulze rule, greater the charge on oppositely charged ions, greater is its coagulating power. Since arsenic sulphide is a negatively charged sol, thus, the order of coagulating power is :                       Na+ < Ba2+ < Al3+ 

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