Physical Chemistry Questions

2 8 0 ions 3 6 0 ions 4 4 0 ions 1 12 02 ions If the distance between 1 2a pm Which of the following expressions is correct in the case of a sodium chloride unit cell edge length a Na and Cl ions in NaCl crystal is a pm what is the length of the cell edge 3 4a pm 4 a 4 pm d 2 a 2 pm

molar mass of the compound carbon tetrafluoride C below for calculating the F Molar mass of element g mol g mol X X Moles mol mol II 11 Molar mass carbon tetrafluoride Mass in one mole of carbon tetrafluoride 00 50 S

34 48 When air is replaced by a dielectric medium of constant K the maximum force of attraction between two charges separated by a distance

For which of the following equilibrium reaction unit of Kc is L mol A g A g B g A g B g 2 B g A g B s C g C g D s

5 For a reaction 2A B A B then which of the following is correct 1 the unit of k is second 2 tis constant 3 the rate of formation of C is twice to that of rate of disapperiance of A 4 the value of k is not depend upon concentration of A and B A first order roactic 7500 C the rate law is rate k 5 37f4f 2A B C A B 1 kansass Fred Kinetics Periodic Tal Cafe aff q 2 5 2 3 C 49 A faqtisku sasa it he 4 R Gur 9 Fo re

The variation of conductance of the mixture is continuously measured for the titration of a 0 5 M Ba OH 2 solution against 0 5 M MgSO4 solution Which of the following graph best represents the variation of conductance Conductance Conductance Conductance tance Vol of MgSO4 Vol of MgSO4 Vol of MgSO

114 When equal volumes of the following solutions are mixed the precipitation of AgCl Ksp 1 8 x 10 10 will occur with a 10 M Ag and 10 M Cl c 10 5 M Ag and 10 6 M Cl al b 10 5 M Ag and 10 5 M CI d 10 0 M Ag and 10 10 M Cl

The ionic radii of Rb and I are 1 46 and 2 16 A The most probable type of structure exhibited by thi 1 CsCl type 4 CaF type NaCl type 3 ZnS type A solid AB has NaCl type structure If the radius of the cation A is 100 pm then the radius of the ani

nsider the reaction A B at 1000 K At time t the temperature of the system was increased to 00 K and the system was allowed to reach equilibrium Throughout this experiment the partial essure of A was maintained at 1 bar Given below is the plot of the partial pressure of B with time hat is the ratio of the standard Gibbs energy of the reaction at 1000 K to that at 2000 K Partial Pressure of B bar 115 100 50 10 1 t time

For which one of the following is AH reaction equal to AH f for the product 1 2CO g O2 g 2CO2 g 2 3 4 orrect Answer 4 our Answer N2 g O3 g N2O3 g CH4 g 2Cl2 g CH Cl2 1 2HCI g Xe g 2F2 g XeF 4 s

litrous acid is a weak acid and ammonia is a weak base Based on this information what is the pH of ammonium nitrite elect the correct answer below Basic Acidic Neutral

109 An acid base indicator has KHIn 3 0 10 5 The acid form of the indicator is red and the basic form is blue The change in H required to change the indicator from 75 red to 75 blue is a 8 x 10 5 M b 9 10 5 M c 1x 10 5 M An acid base indicator which is a w 110 d 3 x 10 M

4 moles each of SO2 and O2 gases are allowed to react to form SO3 in a closed vessel At equilibrium 25 of O2 is used up The total number of moles of all the gases at equilibrium is 1 6 5 2 7 0 3 8 0 4 2 0

slow N fast NO F F NO F NO F NO F 341 34fell disch ch fay yar fac 2 1 r k NO F 2 K NO F 3 F k NO 4 r k F at f 22 d ve 202 at d 1 dl 2 I lady

Which of the following is not correct O O O O Gibbs energy is an extensive property Electrode potential or cell potential is an intensive property Electrical work AG If half reaction is multiplied by a numerical factor the corresponding E value is also multiplied by the same factor

are as follows What is order of reaction Initial concentration 350 540 158 425 275 941 11 2 1 0 5 2 1 5 3 2 5 lire period and initial concentration for a reaction 7 4 2 0 5 32 675 25 12 5 FR F t 2 1 0 5 2 1 5 3 2 5 4 2 a E BERA hell and fetit 350 540 1 58 425 275 941 auform for for ade

4 none of these 102 At 298 K assuming ideal behaviour the average kinetic energy of a deuterium molecule is 1 Two times that of a hydrogen molecule 2 Four times that of a hydrogen molecule 3 Half of that of a hydrogen molecule 4 Same as that of a hydrogen molecule 105 TH tha 1 2 3 4 106

4 Schottky defects have no effect on the physical properties of solids The edge length of a face centred cubic cell of an ionic substance is 508 pm If the radius of the cation is AIEEE 2010 110 pm the radius of the anion is 1 288 pm 2 398 pm 3 618 pm 4 144 pm du centered packed structure ar

1 An oxide of N has vapour density 46 Total number of electrons in its 92 g are a 48 N b 46 N c 92 N d none of these The de Broglie wavelength of a 66 kg man sking down

A solid X melts slightly above 273K and is a poor conductor of heat and electricity To which of following categories does it belong 1 Ionic solid 2 Covalent solid 3 Metallic 4 Molecular

51 What would be the magnitude of the EMF of the following cell 0 1 M acetic acid Pt H 0 1 M sodium acetate 0 1 M formic acid 0 1 M sodium fomate Pt H at 25 C The ionization constant of acetic acid K while that of formic acid K 104 1 0 0295 V 2 0 059 V 3 0 059 V 4 0 0295 V 10 5

Which of the following statements are correct in context of point defects in a crystal 1 AgCl has anion Frenkel defect and CaF has Schottky defects 2 AgCl has cation Frenkel defects and CaF has anion Frenkel defects 2 3 AgCl as well as CaF have anion Frenkel defects 4 AgCl as well as CaF has Schottky defects

8 Exp No 1 2 The following data are for the reaction A B Product 3 4 Concentration 4 0 x 104 1 6 x 10 1 0 x 10 1 0 x 10 The correct statement s regarding given reaction is are a Overall order of reaction is 2 b The rate of reaction is independent of concentration of B of A M 0 10 0 20 0 50 0 50 3 a c 4 a b c Concentration of B M 0 10 0 20 0 10 0 50 Rate MS c The rate constant is 4 x 10 2 L mol S 1 a b 2 b c 8 4 2 Exp No 1 2 3 4 fufhalt folg fysis fed Concentration Concentration Rate MS of B M of A M 0 10 0 10 24 0 20 0 20 0 50 0 10 0 50 0 50 4 0 x 10 a life 2L b B Revision Test Series PTS for NEETUL2015 1 6 x 109 1 0 x 102 1 0 102 c Fai 4 x 102 L mot S U 1 a b 2 b c 3 a c 4 a b c The 12 A 4X10 2 k 0 Tor 2 Te b

a 4 1 b 6 1 c 5 1 d 3 1 111 A 20 0 mL sample of a 0 20 M solution of the weak diprotic acid H A is titrated with 0 250 M NaOH The concentration of solution at the second equivalent point is a 0 10 M NaHA b 0 153 M Na A c 0 10 M Na A 12 During the titration of a weak diprotic acid H d 0 0769 M Na A 4 against a strong baso NOH the pll of the

40 Oxygen consists of 016 017 and 018 isotopes and carbon consists of isotopes of C12 and C 3 Total number of CO2 molecules possible are 6 c 18 Ca M w 0120 b 12 d 1 pour density 46 Total number of 2

Consider the balanced chemical reaction below How many grams of F are needed to produce 120 g of PF3 if the reaction has a 73 2 yield and assuming there are 1000 g of solid P4 available P4 s 6 F g 4 PF 3 g NEXT Based on your knowledge of stoichiometry set up the table below that represents 100 yield with the given reaction conditions Before mol Change mol After mol P4 S 2 6 F g 4 PF 3 g

JIUS 1 4 2 6 3 8 4 unpredictable If the radius of K and F are 133 pm and 136 pm respectively the distance between K and Fin 1 269 pm 2 134 5 pm 3 136 pm 4 3 pm In zinc blende structure the coordination number of Zn ion is 216 4 8

For which of the following pair heat of neutralisation is less than 13 7 kcal HCI KOH CH3COOH NaOH HCI NaOH H SO4 NaOH

In a reversible reaction A B 2 C the equilibrium concentrations of A B and C are 2 M 2 M and 4 M respectively then Kc for the reaction is 1 2 4

If for the reaction A s B g C g total pressure is at equilibrium is P atm then value of Kp is p 2 P 4

In zinc blende structure the coordination number of Zn ion is 1 2 24 3 6 Cesium chloride on heating to 760 K changes into 2 NaCI structure 1 CsCI g In the crystal lattice of diamond carbon atoms adopt 4 8 3 antifluorite structure 4 ZnS structur

1 The following reaction has a Kp 4 5 x 10 at 825K Determine the value of Kc for the reaction at that same temperature CH4 g CO2 g 2CO g 2H2 g a 4 5 x 10 2 b 6 6 C 0 098 d

Consider the following reaction 1 g Cl g 21Cl g Kp 81 9 at 25 C A reaction mixture at 25 C initially contains 0 266 atm 12 0 266 atm Cl and 0 316 atm ICI What is th concentration of ICI at equilibrium in atm Report your answer to 3 decimal places without units

a 3 x 10 M b 9 10 M 3 x 10 M 110 An acid base indicator which is a weak acid has a pKa value 5 45 At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half way between those of its acid and conjugate base forms pKa of acetic acid 4 75 b 6 1 d 3 1 a 4 1 c 5 1

109 If 1 g of each of the following gases are taken at ST then which of the gases will occupy the greatest volume CO H O CH NO 1 CH4 2 H O 3 NO 4 CO

Consider the following compounds in the liquid form O2 HF H O NH3 H O2 CC14 CHCl3 C6H6 C6H5Cl When a charged comb is brought near their flowing stream how many of them show deflection a per the following figure

a 10 4 b 10 1 c 6 1 d 10 7 103 The pH of the resultant solution of 20 mL of 0 1 MH3PO4 and 20 mL of 0 1 M Na3PO4 is pKq pK a c pK a2 d 2 during the titration of NaOH a pk log 2 a b pKa a

is are correct 8 1 The pH of 1 0 10 M solution of HCI is 8 2 The conjugate base of is 3 Autoprotolysis constant of water increases with temperature 4 When a solution of a weak monoprotic acid is titrated against a strong base at half neutralization point pH pka A 2 3 B 1 2 3 C 3 4

AB 2 A B 3 AB For an ionic solid of general formula AB and coordination number 8 for both A and B the value of ra ratio will be 1 less than 0 225 3 between 0 414 and 0 732 2 in between 0 225 and 0 414 greater than 0 732

he figure below is the plot of potential energy versus internuclear distance d of H molecule in e electronic ground state What is the value of the net potential energy E as indicated in the figure nkJ mol 1 for d do at which the electron electron repulsion and the nucleus nucleus repulsion nergies are absent As reference the potential energy of H atomis taken as zero when its electron and the nucleus are infinitely far apart Jse Avogadro constant as 6 023 x 1023 mol Potential Energy kJ mol Eo H d H v do Internuclear distance d

35 In the reversible reaction 2 NO disappearance of NO is equal to 1 NO 1 2k k 2 2k NO 1 2 N 04 3 2 k NO 1 K N 04 4 2 k k NO k 4 1 k N O4 the rate of 344 3442 NO 1 2k1 NO k 2 2k NO 1 2k 0 3 2k NO K N 04 4 2 k k NO sese 2 00 N O4 NO fac Id Care 2 at of N 7 NOL

1 Consider the following cell reaction 2Fe s O g 4H aq 2Fe aq 2H O 1 E 1 67 V At Fe 10 3 M p O 0 1 atm and pH 3 The cell potential at 25 C is 1 1 47 V 2 1 77 V 3 1 87 V 4 1 57 V

4 Calculate the concentration of Ni in the solution prepared by mixing a 50 mL 0 03 M Ni with 50 0 mL 0 05 M EDTA b 50 mL 0 03 M Ni with 30 0 mL 0 05 M EDTA The mixture is buffered to pH 3 0 Kr 4 2x10 8 pH 3 04 2 5x10

In the given compound which carbon atom will show minimum electronegativity 1 Fourth 3 Third 2 First 4 EN of all the carbon is same

A 1 litre solution containing equal moles of FeO and Feo 80 was titrated with 70 ml 0 3M KMnO4 in acid medium Millimoles of Fe3 produced are

so you did not get a Exercise 1 Complete the sentences with the correct form of the verbs given in brackets If you catch the first bus you there in time get If she If you try again you 4 If you heat iron it 5 We 6 7 8 1 2 3 If they I ll see him if I If we here I will phone you come succeed expand ready if you come at five be today I ll ring her up come free be we ll miss the train not hurry

69 Minimum number of capacitors each of 8 F and 250 V used to make a composite capacitor of 16 F and 1000 V are a 8 b 32 c 16 d 24 79 A capacitor of capacitance C is charged to a

tructure of 21 In an atom two electrons move around the nucleus in circular orbits of radii R and 4R The ratio of the time taken by them to complete one revolution is 1 4 b 4 1 1 8 d 8 7 nergy and the total energy

Consider the following compounds 1 Sodium acetate 2 Acetic acid sodium acetate 3 Acetic acid The pH of their equimolar aqueous solutions will be such that A 3 2 1 B 2 1 3 C 1 2 3 D 3 1 2

4 Rb H 0 88 AB is a covalent compound If electronegativity of A and B 88 AB A are 2 and 3 then percentage covalent character in AB is 23 AB 1 19 5 2 80 5 3 40 4 None of these 1 19 5 2 80 5 3 40 4 9 Effecitve nuclear charge of C is 3 60 then value of x is 89 C 0 85 1 1 2 4 3 6 cfl Eg 3 60 15 25