SURFACE CHEMISTRY Quiz-1

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SURFACE CHEMISTRY QUIZ-1

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. Aluminium hydroxide forms a positively charged sol. Which of the following ionic substance should be most effective in coagulating the sol?

•  NaCl
•  CaCl2
•  Fe2(SO4)3
•  K3 PO4

Solution
(d). Al(OH)3 is positively charged sol. K3PO4 has greater negative charge. Hence, it is most effective in coagulation of Al(OH)3 sol

Q2.The colloidal sol of As2S3 prefers to adsorb

•  NO3^⊖
•  K^⨁
•  S^(2-)
•  H^⨁

Solution
option-(d)

Q3.  Which of the following is present at the time of cracking of hydrocarbons?

•   Copper
•  Zeolite
•  Nickel
•  Molybdenum

Solution
option-(b)

Q4. The stabilization of a dispersed phase in a lyophobic colloid is due to

•  The adsorption of charged substances on dispersed phase
•  The large electro-kinetic potential developed in the colloid
•  The formation of an electrical layer between two phases
•  The viscosity of the medium

Solution
option-(c)

Q5.Which of the following can act as a protective colloid?

•  Gelatin
•  Silica gel
•  Oil-in-water emulsion7
•  All correct

Solution
 option-(a)

Q6. Which one of the following is a natural colloid?

•  Sodium chloride solution
•  Cane sugar solution
• Urea solution
•  Blood

Solution
option-(d)

Q7.Gold number of a lyophilic sol is such a property that

•  The larger its value, the greater is the peptizing power
•  The lower its value, the greater is the peptizing power
•  The lower its value, the greater is the protecting power
•  The larger its value, the greater is the protecting power

Solution
(c). The reciprocal of gold number is directly proportional to the protecting power

Q8.Which is/are correct statements about the role of a catalyst in a reaction?

•  It is reactant in a rate-determining step and then a product of some subsequent step
•  It provides an alternate mechanism with a lower energy of activation
•  It increases the rate of chemical reaction but does not itself undergo a permanent change during the course of the reaction
•  All of the above

Solution
option-(d)

Q9.The diameter of colloidal particle is of the order

•  10^(-3) m
•  10^(-6) m
•  10^(-15) m
•  10^(-7) m

Solution
option-(d)

Q10. Compared to common colloidal sols micelles have:

•  Higher colligative properties
•  Lower colligative properties
•  Same colligative properties
• None is true

Solution
Section 138 of the Negotiable Instruments Act, 1881 states that the dishonour of cheque is a criminal offence and is punishable by imprisonment up to two years or with monetary penalty or with both.