PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Which of the following organic molecule is not aromatic. Benzene Naphthalene Anthracene Cyclo-octatetraene
2 Which of the following class of compounds follow the criteria of aromatically. The compounds must have high degree of unsaturation they must have the property to undergo addition reactions They must have the property to undergo substitution reactions They must have the ability to sustain an induced current in NMR
3 Which of the following statements in not correct with respect to the important characteristics of aromatic compounds. They are usually cyclic compounds They are resistant to usual addition reactions They usually undergo substitution reactions They are less stable
4 Which of the following statements is not correct. with respect to resonance. The position of atomic nuclei mus be same The limiting structures must have same number of paired and unpaired electrons. The energy of the various limiting structures must contribute equally All above
5 The decrease in electron density at one position accompanied by a corresponding increase at other position is called. Inductive effect Asymmetric effect Electromeric effect Resonance effect
6 Which of the following statement is not correct with respect to electrometric effect. It is permanent effect It is brought into play instantaneously at the demand of attacking reagent It proceeds a polar addition reaction The original electronic condition is restored after the removal of tacking regent.
7 To complete transfer of a shared pir of electrons to one of the atoms joined by a double or triple bond at the requirement of an attacking reagent is known as. Inductive effect Resonance effect Eletromeric effect Stark effect
8 Which of the following case of acid or base strength is not explained by inductive effect. Formic acid> acetic acid Dimethyl amine > trimethyl amine Dimethyl amine > methyl amine Chloroacetic acid > acetic acid
9 Correct order of increasing ______ I effect of groups is ----- NO2 &gt;-----------CN &gt; ------------COOH &gt; -------------F --------F &gt; -------------COOH&gt;----------CN&gt;--------NO2 -----F&gt; -------------CN&gt;--------NO2 &gt; COOH<div><br></div> -------CN &gt; ------------COOH &gt; -----------NO2 &gt;----------F
10 Inductive effect can be used to explain Dipole moment of chemical bonds Strength of acids Strength of bases All above
11 Which of the following statement in not correct with respect to inductive effect. Bond length decrease with increase in inductive effect. Inductive effect generates polar character in bonds Variation in strength of aliphatic acids can be explained It alone cna explain the basically of triphenylamine
12 An induction of dipole or polarity in non polar bond, and consequent electron shifting along a chain of atoms is known as. Inductive effect Resonance effect Hyper conjugation None of the above
13

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>
14

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

 Zero order First order Second order Third order
15 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
16 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
17 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
18 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)
19 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>
20 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
21 The enrichment of chemical substance at the surface of a solid is called Adsorption Absorption Sorption Isotherm
22 A colloidal system in which both the dispersion phase and dispersed phase are liquid is. Smoke Emulsion Whipped cream Mist
23 Which of the following methods does not give the weight average molecular weight. Sedimentation equilibrium Sedimentation velocity Light scattering Osmotic method
24 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
25 Which of the following is a natural polymer Nylon Leucite Cellulose Polystyrene
26 Which of the following methods gives the number average molecular weight of a polymer. Light scattering method Osmotic method Sedimentation equilibrium method Viscosity method
27 In emulsions , the dispersed phase and the dispersion medium are. Both solids Both liquids Both gases Phase is liquid and medium is solid.
28 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
29 The colloidal solution of arsenic sulphide prefers to absorb NO3 K+ S2- H+
30 The tyndall effect is not observed in Suspensions Emulsions Colloidal solutions True solutions
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