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

Retarded reaction are those

 <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;text-indent: .5in;line-height:normal"><span style="font-family:&quot;Times New Roman&quot;,&quot;serif&quot;; mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font: major-bidi">In which the rate of the reaction is independent of pressure<o:p></o:p></span></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;text-indent: .5in;line-height:normal"><span style="font-family: &quot;Times New Roman&quot;, serif; text-indent: 0.5in;">In which products are strongly adsorbed on the surface of the solid catalyst</span></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;text-indent: .5in;line-height:normal"><span style="font-family:&quot;Times New Roman&quot;,&quot;serif&quot;; mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font: major-bidi">Which are reversible under all conditions<o:p></o:p></span></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;text-indent: .5in;line-height:normal"><span style="font-family:&quot;Times New Roman&quot;,&quot;serif&quot;; mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font: major-bidi">For which G is positive<o:p></o:p></span></p>
2

The kinetics of the decomposition of ammonia on the tungsten surface follows

 Zero order First order Second order Third order
3 Which of the following state is not correct regarding Langmunir adsorption theory. Adsorbent has specific equivalent sites One site can adsorbs only one molecule Adsorbed molecules cannot interact with each other Adsorption is a static process
4 The Langmuir theory of unimolecular adsorption is generally valid at. Low pressures and low temperature Low pressures and high temperature High pressures and low temperature High pressure and high temperature
5 According to the Langumir isotherm , when the pressure of the gas is very large, the adsorption. Is directly proportional to pressure Is inversely proportional to pressure Is directly proportional to the square of the pressure. Is independent of pressure
6 The Langmuir adsorption iso therrn shows that the amount of adsorbed gas per gram of the solid is equal to. ap/1+bp ap+1/1-bp 1+ap/1-bp a(1+bp)
7 In terms of the amount of the substance adsorbed per gram of the adsorbent (x/m), and pressure p of the gas, the Freudlich adsorption isotherm is represented as. x/m = k/p<sup>n</sup> x/m = kp<sup>n</sup> p = k (x/m)<sup>n</sup> x/m = (k/p)<sup>n</sup>
8 Which of the following characteristics of adsorption is wrong. Adsorptoin on solids is reversible in nature Adsorption, in general increase with increase in temperature. Adsorption is generally selective in nature. Both enthalpy and entropy of adsorption are negative
9 The enrichment of chemical substance at the surface of a solid is called Adsorption Absorption Sorption Isotherm
10 A colloidal system in which both the dispersion phase and dispersed phase are liquid is. Smoke Emulsion Whipped cream Mist
11 Which of the following methods does not give the weight average molecular weight. Sedimentation equilibrium Sedimentation velocity Light scattering Osmotic method
12 Which of the following statements is not correct regarding the structure of DNA. It has a double helix structure. There are hydrogen bonds in its structure Unlike RNA there is no fixed ratio of bases in DNA The code for protein synthesis is given by the sequence of bases in DNA
13 Which of the following is a natural polymer Nylon Leucite Cellulose Polystyrene
14 Which of the following methods gives the number average molecular weight of a polymer. Light scattering method Osmotic method Sedimentation equilibrium method Viscosity method
15 In emulsions , the dispersed phase and the dispersion medium are. Both solids Both liquids Both gases Phase is liquid and medium is solid.
16 Which of the following statement is not correct regarding the stern theory of charge on colloidal particles. The colloidal particle has a charge distribution at its surface. In the immediate vicinity of the colloidal particles there is an excess of counter ions The greater the concentration and charge of ions in the diffused electrical double layer. the larger is the thickness of the layer At large distance from the colloidal particles, the concentration of co-ions and counter ions are almost equal
17 The colloidal solution of arsenic sulphide prefers to absorb NO3 K+ S2- H+
18 The tyndall effect is not observed in Suspensions Emulsions Colloidal solutions True solutions
19 The process of passing of a precipitate into colloidal solution, on adding an electrolyte is called. Dialysis Peptization Electrophoresis Electromsmosis
20 Wlhich of the following can act as a protective colloid Gelatin Silica gel Oil in water emulsion All three
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