PPSC Chemistry Part I Physical Chemistry Online Test With Answers

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PPSC Chemistry Part I Physical Chemistry Online Test

Sr. # Questions Answers Choice
1 The tyndall effect was used by Zsigmondy to device. The ultramicroscope The ultracentrifuge The osmometer Electrodialysis
2 A colloidal system in which a liquid is dispersed in a solid is called a/an Emulsion Sol Gel Precipitate
3 An emulsifier is an agents which Stabilizes an emulsion Homgeneises and emulsion Causes coagulation of an emulsion Helps in the formation of an emulsion
4 A silver iodide and was prepared by mixing KI and AgNO2 solution with the AgNO2 in slight excess. Which of the following descriptions is correct regarding is not particles. Negatively charged because of the excess of NO-3 ions Positively charged because of the excess of Ag+ ions in the AgI lattice Negatively charged because I ions are adsorbed from the KI solution Neutral
5 Which of the following will be most effective int he coagulntion of
Fe (OH)3 sol.
 NaCl MgSO4 AlCl3 Mg3 (PO4)2
6 The stabilization of the dispersed phase in a lyophobic sol is due to Liking for the dispersion medium The surface tension of the medium The formation of an electrical layer between the two phases The viscosity of the medium
7 Which of the following electrolytes will be most effective in the coagulation of arsenic sulphide sol. NaNO3 AI PO4 MgSO4 K4[Fe(CN)6]
8 When a strong beam of light is passed through a colloidal solution, the light will Be reflected Be scattered Pass unchanged Be dispersed
9 In the process of electrosmosis Colloidial particles move towards the electrodes Both colloidal particles and dis persons medium move Only dispersion medium moves to carry the current Positively charged colloidal particles move, but negatively charged particles remain stationary
10 Smoke is a dispersion of Gas in gas Gas in solid Solid in gas Liquid in gas
11 The migration of positively charged colloidal particles, under an electrical field , towards the cathode is called. Cataphoresis Electroamosis Sedimentation Electrodialysis
12 The process of removing disolved impurities from a colloidal system, by means of diffusion through a suitable membrane under the influence of an electric field , is called. Electrosmosis Electrodialysis Electrophoresis Peptization
13 Which of the following colligative properties can be used to characterize colloidal particles. Lowering in vapour pressure Elevation in boiling point Depression in freezing point Osmotic pressure
14 Colloids can be purified by Peptization Coagulation The Breeding are method Dialysis
15 Which of the following is the cause of Brownian movement of colloidal particles. Convection currents int he fluid Bombardment by the molecules of the dispersion medium Setting of dispersed phase under gravity. Thermal gradient in the medium
16 Which of the following statement is false regarding lyphilic sols. The colloidal particles show a linking for the dispersion medium These are generally easy to prepare These are more stable than lyophobic sols The stability of the sols is mainly due to the electrical double layer
17 A system is said to be in the colloidal state if the particle size of the dispersed phase ranges from <div> <sub>o</sub></div>I to 10 A 10 to 10000 A 10 to 100 A 1000 to 10000 A
18 In a standard Weaton cell the cathode is Cadmium amalgam Mercury Platinum Carbon
19 Concentration polarization arises because of the Different concentrations of solutions in the two half cells Changes in the concentration of electrolyte around the electrode from bulk concentration Reversible nature of the cell Variation in temperature during measurements
20 A half cell reaction is one that Occurs at one electrode Goes only half way to completion Involves a half mole of the concentration of the solution Always oxidizes
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