Physical Chemistry Questions

KJ T too 317 d g 1 AB LCD 3 BC ve Potential o energy ve 4 Both AB and CD C 1 U BC AB le 85 F 1 A 2 3 4

The equilibrium SO g NO g all four gases is taken in a one litre container the equilibrium concentration of SO3 would be A B C D 0 4M 0 6M 1 4M constant Kc for the reaction SO g NO g is 16 If one mole of 1 6M

Among the following the correct statement s is are A AI CH has the three centre two electron bonds in its dimeric structure B AICI has the three centre two electron bonds in its dimeric structure C BH has the three centre two electron bonds in its dimeric structure D The Lewis acidity of BC1 is greater than that of AICI

11 A hydrogenation reaction is carried out at 500 K 500 K no catalyst CH CH H CH3 CH3 Activation energy EkJ mol a Pd 400 K CH3 CH3 CH CH H Activation energy E 20 kJ mol If rate remains constant then Eis 1 120 kJ mol 3 20 kJ mol 1 2 100 kJ mol 4 entIm

The resistance of M 10 solution of an electrolyte is 250 ohm The cell constant is 1 25 cm Then the molar conductance of the solution is s cm mol 1 100 2 125 3 250 4 50

Calculate the temporary permanent and total hardness in terms of CaCO3 equivalent in a water sample containing following dissolved salt per liter Ca HCO3 2 12 2 mg Mg HCO3 2 8 2 mg MgSO4 5 6 mg MgCl2 6 2 mg CaSO4 10 3 mg and Na SO4 7 5 mg Atomic weight Ca 40 Mg 24 C 12 S 32 O 16 H 1 Cl 35 5

not change but a changes 5 For an equilibrium H O s H O 0 which of the following statement is true 1 The pressure changes do not affect the equilibrium 2 More of ice melts if pressure on the system is increased 3 More of liquid freezes if pressure on the system is increased 4 None

The simultaneous solubility of AgCN Kp 2 5 x 10 16 and AgCl Kp 1 6 x 10 19 in 1 M NH aq are s and respectively Then Given K Ag NH3 2 107 A S B S C 27 mol L 10 4 1728 cr CN mol L 6 4 105 S D Separate values of s and s cannot be determined just their ratio 5625 T C

3 5 Methylene blue in aqueous solution is adsorbed on activated charcoal at 25 C For this process the correct statement is 1 The adsorption is accompanied by a decrease in enthalpy 2 The adsorption requires activation at 25 C 3 The adsorption increases with increases of temperature 4 The adsorption is irreversible

During the electrolysis of aqueous K SO4 using inert electrodes to produce 0 1 mole of oxygen gas at anode using a current of 5 amp the time required is seconds 11 3860 2 1930 3 7720 4 17232

Given the following information 2A g B g A B g Kp1 2A g C g 2AC g Kp2 3 2A2 g B g C g AC g A B g Kp3 Which relationship represents the equilibrium constant for the reaction 3A g 3B g 2C g 3A B g C g Knet A Knet Kp1 x Kp2 x Kp3 B Knet Kp1 x 2Kp3 Kp2 C Knet Kp1 Kp2 2 Kp3 D Knet Kp1 x Kpa Kpz E Knet Kp1 x Kp2 x Kp3 OE O S D OA OC OB P

Number of spectral line obtained when electron is provided with a photon of energy of 11 eV for H atom 01 02 00 06

Which of the following equation represents the standard heat of formation A C diamond 2H g CH g B C graphite 2H g CH g C C diamond 4H g CH g D C graphite 4H g CH g

Write the formulation for the galvanic cell in which the reaction Cu s 2Ag aq Cu aq 2 Ag s takes place Identify the cathode and anode reactions in it 1 Write Nernst equation and calculate the e m f of the following cell Sn s Sn 0 04 M H 0 02 MOH

Calculate the pH of 1 00 L of buffer containing 1 00 M CH3CO2Na 1 00 M HCH3CO2 before and after adding a 0 080 moles of NaOH b 0 12 moles of HCI Assume that the volume of the solution does not change

57 Which of the following is a polar molecule 1 Cl 2 CCI 3 SF CI SF r 4 HO Incorrect statement regarding hybridization is OH J67 ffafed 1 Cl 2 CCI 3 SF 4 HO o CI OH Ch 68 THEY A

2 1 25h 1 X 4 TL 58 If ionisation energy for He ion is x Kcal mol then find out 58 Het x Kcal molt the energy of electron in 3rd Bohr orbit of Li ion in terms of x in Kcal mol X 2 4 13 4x JA 4x If x E Fixzz2 erroct 4 E x 2 T Kcal mol x 1 X x X 2 4 32 3 4x 4 4x ccording to 59 THIS BAR H 5

Same quantity of electricity is passed through molten NaCl MgCl2 and AIC connected in series Then the ratio of the volumes of chlorine gas liberated fro these three electrolytes respectively is 1 1 2 3 2 3 2 1 3 1 1 1 4 6 3 2

4 Cs and I 61 An ionic bond A B is most likely to be formed when 1 the ionization energy of A is high and the electron affinity of B is low 2 Cs F 3 Na C 4 CI 61 A B a factor forg Asia dal fa 1 alfer 2 egin areal af B 2 the ionization energy of A is low and the electron affinity of B is high 3 the ionization energy of A and the electron affinity of B is high 4 the ionization energy of A and the electron affinity of B s low aximum lattice energy would he 3 A B din anal fuc f 4 OTfOr

Calculate the percentage composition of zinc phosphorus and oxygen in zinc phosphate Zn3 PO4 2 Zn 65 5 P 31 and O 16 u 36 0 90 g of an organic compound containing only carbon hydrogen and nitrogen on combustion gave 1 1 g CO and 0 3 g water What is C H and N in the organic compound 37 Calculate the number of atoms of oxygen present in 132 g CO What would be the weight CO having the same number of oxygen atom

The following mechanism has been suggested for the reaction H O 2H 21 1 2H O 1 H O 1 2 OH H H O 3 HOI H 1 1 H O Identify the rate law that s consistent with the mechanism A Ratek H O 1 B Rate k HO H C Rate klOH H D Rate k HO HD E Rate k H O HP OD OA DE HOI OH Slow Fast Fast

4 Depends upon Ka of acid 76 In which of the following the solution of AgSCN will be unsaturated 1 Ag SCN K p 2 Ag x SCN K p 3 Ag x SCN K p 4 Ag SCN P K p 77 Which of the following pair of species have maximum difference of IP

3 Match each of the diatomic molecules ions in Column I with its property properties in Column II Column I Column II JEE 2009 A B P Paramagnetic Q undergoes oxidation R Undergoes reduction S Bond order 2 T Mixing of s and p orbitals LIEE 20001

omers of dimethyl 66 NaHCO decompose as 4 4 5 een given compound 2NaHCO s Na CO s CO g H O g The equilibrium pressure is 1 04 atm The K for reaction is 1 0 2704 atm 2 2 704 atm

47 At 25 C Ag NH3 e Ag s 2NH E 0 02V Ag e Ag s E 0 8V 3 9 What will be the range of magnitude of equilibrium constant of following reaction 6 3 X100p 63X250 1 40 XIX Ag NH3 Ag 2NH 1 10 14 2 106 3 10 10 4 10 18 XFXE OU 4 0 94 volt 47 25 C Ag NH3 e Ag s 2NH3 E 0 02V Ag s E 0 8V Ag di alfafed fefe B 1 x y 20 Ag NH 1 10 14 XXXXood 1006 2 106 1X X018 3 10 10 4 10 18 Ag 2NH feric 0178 0106 lug koq 78 13 0 8 78 10

85 SCQ B Which of the following Lewis acid base interactions are associated with the further involvement of d orbitals A SbF5 HF H SbF6 C D en AlCl3 Cl AlCl4 NH3 BF3 NH3BF3 PH H PH D Correct Answer C

80 Ionic compound in which cation and anion are bonded by 80 minimum force of attraction mg img 1 Na N 2 Mg3N 3 Ca3N 4 BeO A ca Atsumot that Amie the compount have ttraction mana

b What is coagulating value The coagulating value of A and B will be 2 4 x 10 millimole per litre and 1 2 X 102 millimole per litre which one has higher coagulating power c What is Craft temperature T 2 2

4 h P 200x35x1024x4X344 200 35 10 27 3 P h 2 54 If the Planck s constant is 6 6x10 34 J s the de Broglie 54 fe ich fraich 6 6x10 34 J 4 h wavelength of a particle of mass 3 3x 10 27 Kg and veloc ity 200 ms will be 1 2 A 2 5 3 20 10 3 10 55 For any li 2 ms 2 1 2 2 5 3 20 4 10 0 FR43 3x 10 27 kg 200 3251 6 62X10 37 305810 27 X200 34 9

24 The density of solid argon is 2 3 amu 4 at 40K If the Argon atom is assumed to be dvolot 1A5 1 TPS 35 5 4 35 5 5nn by density al vol of unit cell for 3 A what percentage of sphere of radius 0 771 3 solid Argon is apparently without anything D 80 POCO SHOT ON 20 B 40 C 60 C 60

E A team of General Chemistry 1 learners are undergoing a science laboratory activity on chemical equilibrium How can they achieve equilibrium A When the nature of the reactants and products remains constant B When the concentration of the reactants and products remains constant C When the rate of product reformation is equal to the rate of reactant formation D When the rate of product formation is greater than the rate of reactant reformation

If bond dissociation energy of H Cl and HCI is 10 20 and 60 kcal mol respectively then what is the enthalpy of formation of HCI 45 kcal mol kcal mol Which elements are 3 90 2 45 4 90 kcal mol kcal mol oxidised and reduced

A cubical crystal is such that the comers atoms are occupied by P atoms face centers are occupied by Q atoms alternate tetrahedral voids are occupied by R atoms and edge centers are occupied by Satoms Based on this info identify the correct option Multiple options may be correct If there are no defects in the crystal then the formula should be PQ3R4S3 If all the atoms lying on one of the body diagonal are missing then formula should be PQ4Rg 3S4 If all the atoms lying on a line passing conne cting edge centers are missing then formula should be P QRg Rs If all the atoms lying on a line passing through body center and connecting opposite face centers are missing then formula will be PQRS

Anhydrous CaCl is often used as desiccant In the presence of excess CaCl the amount of water taken up is governed by Kp 6 4 x 108s for the following reaction at room temperature CaCl s 6H O g CaCl 6H O s Which of the following statements is correct about above reaction A At equilibrium addition of CaCl will shift reaction in forward direction B Vapour pressure of water at equilibrium in a closed vessel that contains CaCl s is 5 x 10 15 atm approximately C Vapour pressure of water at equilibrium in a closed vessel becomes half if volume of container is reduced to half at same temperature D If temperature is increased then vapour pressure of water at equilibrium in closed vessel decreases

Calculate HY in a solution prepared by mixing 10 00 mL of 0 0100 M VOSO 9 90 mL of 0 0100 M EDTA and 10 0 mL of buffer with a pH of 4 00 A 4 6 10 0 M B 4 6 10 M C 6 4 10 M D 6 4x10 0 M

Calculate the quantity of pure lime and soda required for softening 100 000 litres of water containing the following impurities The purity of lime is 70 and soda is 85 Ca HCO3 2 30 2 mg mL Mg HCO3 2 20 8 mg mL CaCl2 28 1 mg mL MgCl2 mg mL CaSO4 35 mg mL MgSO4 6 7 mg mL 8 78 I

4 P Q and R 79 Degree of unsaturation of 1 7 2 8 3 6 44 5 is 79 1 7 2 8 3 6 4 5 IUPAC CH3CH N

The solubility of silver chloride can be increased by dissolving it in a solution containing ammonia AgCl s Ag aq Cl aq K 1 6 x 10 10 Ag aq 2NH3 aq Ag NH3 2 aq K 1 5 x 107 What is the value of the equilibrium constant for the overall reaction AgCl s 2NH3 aq Ag NH3 2 aq CF aq Knet A 1 5 x 10 B 2 4 x 103 C 3 1 x 103 D 2 3 x 10 4 E 2 4 x 10 COA OB OD OC OE

Q 21 1 If a solid is made up of three different elements X Y and Z then it is found that th voids formed by these elements are found body diagonally in the cubic arrangement Mention th type of voids formed

When titrating a strong base with a strong acid the pH before the equivalence point Question c options is neutral is acidic because enough acid has been added to neutralize the base leaving excess acid in the solution is basic because not enough acid has been added to neutralize the base leaving excess base in the solution is acidic because the strong base is converted to its conjugate acid

4 Which is correct 1 Li CO Na CO Thermal Stability X 2 NaF KF Lattice energy 3 BaSO MgSO Solubility X 4 All of these aq Lit Ionic mobility aq 82 4 Be Lit aq aq 34 Tagical 1 LICO Na CO arta panifurca 2 NaF KF Ich hof 3 BaSO4 MgSO factual 4 3

graph for question nos 7 8 On a closed rigid vessel combustion of 2 moles of CH was carried out with 10 moles of O At room temperature After combustion was complete what will be the vapour density of contents of vessel A 35 B 70 C 17 5 D 15 8

Standard enthalpy of neutralization for strong acid HCI and weak acid HCN with strong base NaOH is given as follows HCI NaOH NaCl H O AH 57 1 kJ mole AH 51 1 kJ mole Find standard heat of dissociation ionization of weak acid HCN in units HON NaOH NaCN H O kJ mole

hydrogen released vs time for A graph of vol the reaction between zinc and dil HCl is given in figure On the basis of this mark the correct option V5 V3 V V 0 20 30 40 50 a Average rate upto 40 seconds is b Average rate upto 40 seconds is V c Average rate upto 40 seconds is d Average rate upto 40 seconds is c V5 V 50 30 10 Consider the graph given in Q 9 Which of the following options does not show instantaneous rate of reaction at 40th second a V3 V 2 40 30 V3 V 40 V3 V 40 30 b d 3 40 V4 V 50 30 V3 V 40 20 V3 V 40 20

108 cm 4 1 058 x 108 cm 65 The ratio of radius 2nd 4th and 6th orbits of hydrogen 65 A 2nd 4th en 6th 3 0 529 9 4 1 2 4 6 21 4 9 3 1 4 6 4 1 2 3 5 The energy of electron in excited tom in 0 52915 2 645 98 91 h bh 1 XY CC 2 2 646 x 108 cm 3 2 116 x 10 8 cm 1 2 4 6 2 1 4 9 3 1 4 6 4 1 2 3 f 6 13 6 43 d tis 34 eV a

The electrochemical equivalent of a metal is 9 326 x 105 g coulomb If 30 amp current is passed through the molten metal chloride for 10 minutes then the weight of the metal deposited is g 1 0 028 2 0 056 3 1 68 4 3 36

35 Photoelectric effect is the phenomenon in which a photons come out of a metal when it is hit by a beam of electrons b photons come out of the nucleus of an atom under the action of an electric field c electrons come out of a metal with a constant velocity which depends on the frequency and intensity of incident light wave 145 out of a metal with different electrons come velocities not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity increasing order lowest first for the values of e m 6

2 The pair of elements which on combination are most likely 52 fa to form an ionic compound is 1 Na and Car 3 O and Cl 2 K and O 4 Al and I A 4 M PO4 3 1 Na Ca 3 CI 2 KO 4 Al I

4 5 mL 2 sec 61 The reaction 10 7 1 H g AgCl s H aq Cl aq Ag s 2 Occurs in the galvanic cell 1 Ag AgCl s KCI sol AgNO3 sol Ag 2 Pt H g HCl sol AgNO3 sol Ag 3 Pt H g HCl sol AgCl s Ag 4 Pt H g KCI solr AgCl s Ag 3216 2 3 100 mL 10 sec 4 5 mL 2 sec 61 3 1 is 7 8 X t L H g AgCl s H aq CF aq Ag s fa af 1 Ag AgCl s KCI sol AgNO3 sol Ag 2 Pt H g HCl solr AgNO3 sol Ag 3 Pt H g HCl sol AgCl s Ag 4 Pt H g Kel sol AgCl s Ag X 10 2 x 5 3 1 FC

Two moles of a monoatomic ideal gas C 1 5 R initially at 400 K in an isolated 1 0 L piston is allowed to expand against a constant pressure of a 1 0 atm till the final volume reaches to 10 L Which of the following conclusions regarding the above change s is are true 00 The final temperature of the gas is 363 K If the same process were carried out to the same final volume but under reversible conditions final temperature would have been less than 363 K In the above process the initial and final temperatures and volumes are related as A 357