SURFACE CHEMISTRY QUIZ-3
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. There is desorption of physical adsorption when
Solution
(a). On increasing the temperature, adsorption decreases
(a). On increasing the temperature, adsorption decreases
Q2.Tyndall effect is not observed in
Solution
(b). Tyndall effect is observed for colloidal solution
(b). Tyndall effect is observed for colloidal solution
Q3. If liquid is dispersed in solid medium, then this is called as:
Solution
(d). It is factual statement
(d). It is factual statement
Q4. Of which of the following colloidal systems, fog is an example?
Solution
(a). In fog, liquid water is dispersed in gas
(a). In fog, liquid water is dispersed in gas
Q5.Which of the following statements is incorrect regarding physisorption?
Solution
(d). Enthalpy of adsorption regarding physisorption is not positive. Rather it is negative
(d). Enthalpy of adsorption regarding physisorption is not positive. Rather it is negative
Q6. The process of passing of a precipitate into colloidal solution on adding an electrolyte is called
Solution
(b). Peptization is a process of passing of a precipitate into colloidal solution on the addition of electrolyte
(b). Peptization is a process of passing of a precipitate into colloidal solution on the addition of electrolyte
Q7.Sorption is the term used when
Solution
(c). In sorption and adsorption take place
(c). In sorption and adsorption take place
Q8.Which of the following catalyst is used during the hydrogenation of oil?
Solution
(b). Ni is used for catalytic hydrogenation of oil
(b). Ni is used for catalytic hydrogenation of oil
Q9.In the adsorption of oxalic acid on activated charcoal, the activated charcoal is called
Solution
(a). Adsorption is a substance on which adsorption takes place
(a). Adsorption is a substance on which adsorption takes place
Q10. Arsenic (III) sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?
Solution
(c). As2S3 sol is a negatively charged colloid. Al^(3+) has greater charge, therefore, Al2(SO4)3 is most effective in the coagulation of As2S3 sol
(c). As2S3 sol is a negatively charged colloid. Al^(3+) has greater charge, therefore, Al2(SO4)3 is most effective in the coagulation of As2S3 sol
