Physical Chemistry Questions

One litre of oxygen containing 1 argon is passed over heated copper and heated magnesium till no further reduction in volume took place the volume finally contained by gas would be approximately 2 200 ml 4 1 litre ov 1 Zero 3 10 ml duco f

0 At 88 C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr What is the mole fraction of benzene in the mixture with toluene that will boil at 88 C at 1 atm pressure benzene toluene form an ideal solution 1 0 416 3 0 688 2 0 588 4 0 740

Dipole dipole forces act between the molecule possessing permanent dipole Ends of dipole possess partial charges The partial charge is a more than unit electronic charge b equal to unit electronic charge c less than unit electronic charge d double the unit electronic charge

On passing electricity through dilute H SO4 solution the amount of substance librated at the cathode and anode are in the ratio 1 1 8 3 16 1 2 8 1 4 1 16

tal energy of an electron revolving energy of an electron revolving in n th orbit En Kinetic energy Potential energy mv 1 r Ze r 1 Ze Ze 1 m mx Ze Ze Ze2 mr r Ze 1 X Total 0 24 Ze 7 mr

Which is the ion of V that has magnetic momen equal to 1 73 BM A V2 DV4 B V3 C V5

Starting with 3 1 mixture of H and N at 450 C the equilibrium mixture is found to be 9 6 NH 22 6 N and 67 8 H by volume The total pressure is 50 atm What will be the value of K The reaction is 3H 2NH3 N A 3 25 105 atm 2 2 B 5 23 x 105 atm 2 C 6 23 x 105 atm D 8 10 atm

In the reactions 1 H 2H H 1 0 20 H O III 2H O 11 AH 436 kJ AH 241 81 kJ 0 H O AH 2 H O can be formed either by II or III Ratio of enthalpy change in III to II is 1 2 8 2 0 36 3 1 2 4 0 82

1 If P and Pg are 108 and 36 torr respectively What will be the mole fraction of A is vapour phase if B has mole fraction in solution 0 5 1 0 25 3 0 60 2 0 75 4 0 35

At 300 K and 1 atm 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20 O by volume for complete combustion After combustion the gases occupy 330 mL Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure the formula of the hydrocarbon is Main 2016 Offline 4 C H10 1 C H 2 C H JEE 3 C Hg

17 Select the law that corresponds to data shown for the following reaction 2A B C D Exp 1 2 3 4 1 Rate 3 Rate A 0 1 0 3 0 3 0 4 B 0 1 0 2 0 4 0 1 Initial rate 1 mol L min 7 5x10 9 0 10 3 6x10 3 0x10 1 K A B 2 K A B K A B 2 Rate 4 Rate K A B

Which of the following is the correct set of volume calculated by ideal gas equation and Vander Waal s equation respectively for 1 mole CO gas at 300K and 10 atmpressure R 0 0821L atm K mol 1 2 463 L 2 56 L 3 2 463 L 2 463 L 2 2 463 L 2 38 L 4 2 463 L 2 75 L

If K for the reaction N O 2NO is 0 66 then what is the equilibrium pressure of N O4 Total pressure at equilibrium is 0 5 atm 1 0 168 2 0 322 3 0 1 4 0 5

4x 107 9 10 kg mol 408 6 10 2 m 6 022 10 mol 10 5x10 kg m 10 5 g cm 11 Intext Questions What is the two dimensional coordination number of a molecule in square close packed layer 5 A compound forms hexagonal close packed structure What is the total number of voids in 0 5 mol of it How many of these are tetrahedral voids

An electrolyte A dissociates into 3 ions in its aqueous solution The osmotic pressure of an aqueous solution with concentration equal to 0 1 M non electrolyte solute B is Under identical conditions what will B be the osmotic pressure of 0 05 MA

27 Predict conditions under which Al might be expected to reduce MgO Hint See Intext question 6 4

For 1 H SO4 solution find it s normality approx 1 0 1 2 0 2 3 0 4 4 0 02

Under identical conditions what will be the osmotic pressure of 0 01 M KI solution compared to the osmotic pressure of 0 1 M glucose solution A 10 B T 5 2 39 1 C T 20 D 2

At 40 C the vapour pressure in torr of mixture of methyl alcohol and ethyl alcohol is representated by P 199x 135 P PA PB where x is the mole fraction of methyl alcohol What are the vapour pressures of pure methyl alcohol and pure ethyl alcohol at 40 C 1 135 and 254 torr PAXD 2 119 and 135 torr 3 119 and 254 torr u bor PA 199 P 22 32 CH OH O 322 34

The enthalpies of neutralization of a weak base AOH and a strong base BOH by HCl are 12250 cal mol and 13000 cal mol respectively When one mole of HCl is added to a mixture containing 1 mole of AOH and 1 mole of BOH the enthalpy change was 12500 cal mol In what ratio is the acid distribution between AOH and BOH g 2 1 3 1 2 2 2 3 4 None of these

Which has the highest entropy per mol of the substance 1 H at 25 C and 1 atm 2 H at STP 3 H at 100 K and 1 atm 4 H at 0 K and 1 atm

ch Q 36 A solid PQ has rock salt type st toms are at the corners of the unit cell If the body centred toms in all the unit cells are missing The resulting 11

KAMA Calculate the shortest and longest wavelengths i Lyman series of hydrogen spectrum

A 2 0 B 0 2 65 The four quantum numbers of the outermost orbital of K atomic no 19 are 1 A n 2 1 0 m 0 s 2 alajoging no 1 C n 3 1 1 m 1 s 2 1 B n 4 1 0 m 0 s 2 0 31 1 D n 4 1 2 m 1 s vodunu 2 12511

acceleration of electron in 1st orbit of He is acceleration of electron 2rd orbit of Be is B 20 C 1 5 D i 4

122 When dissolved in benzene two molecules of benzoic When Acid associate to form dimeric molecules If theoretical molar mass of benzoic acid is 122 g mole what will be its experimental value A 122 g mol B 61 g mol C x V T com D V constar 128 What is the v which contains

A its size B The magnitude of It s C The sign of the charge alone D Both magnitude and sign of its charge 42 A one litre vessel containing a gas at 27 C 6g of charcoal was introduced into it The pressure of the gas fall down from 700 mm to 400 mm Calculate the volume of the gas STP adsorbed per gm of charcoal density of charcoal 1 5 g cm A 50 5 g B 59 6 g C 62 3 g 43 Decomposition of H O can be prevented in presence of D 72 g

The average kinetic energy of one molecule of an ideal gas at 27 C and 1 atm pressure is 3 2 a 900 cal K mol b 6 21 x 10 21 JK 1 molecule 1 c 336 7 JK molecule 2 d 3741 3 JK mol

Q 3 Molar conductivity Am of aqueous solution of sodium stearate which behaves as a strong electrolyte is recorded at varying concentrations c of sodium stearate Which one of the following plots provides the correct representation of micelle formation in the solution critical micelle concentration CMC is marked with an arrow in the figures A Am O Am c CMC CMC Vc B Am D CMC c CMC c

26 Which of the following transition elements has maximum unpaired electrons A Cu B Fe C Cr D Mn

45 0 02M of pyridium hydrochloride having H is 3 6 x 104 what is ionisation constant o pyridine 1 1 54 x10 3 1 54 x 10 6 2 1 54 10 7 4 1 54 x 10 5

A silver wire dipped in 0 1 M HCl solution saturated with AgCl develops oxidation potential of 0 25 V If E 0 799 Ag Ag A 2 95 x 10 1 V the K of AgCl in pure water will be sp C 3 95 x 10 11 B 5 1 x 10 11 D 1 95 x 10 11 Lectrodes The pH of

A 20 litre container at 400 K contains CO g at pressure 0 4 atm and an excess of SrO neglect the volume of solid SrO The volume of the container is now decreased by moving the movable piston fitted in the container The maximum volume of the container when pressure CO attains its maximum value will be Given that SrCO s SrO s CO g K 1 6 atm

i Addition of heat at constant pressure When heat is added to a gas at constant pressure the added heat is used up in two ways One part of it expended for the external work done by the system and the other part of it goes to increase the internal energy of system As a result of increase in internal energy the temperature of the system also increases Suppose when 8q amount of heat is added to 1 mole of a gas at constant pressure the temperature of the gas is increased by dT So by definition Cpm ng D 2

low are present 4 09 2020 many equivalents of Kt and So ions in 0 5eq K S04

Chelating ligands Bidentate or polydentate ligands which attach themselves with central metal ion in a way that they form a ring are known as chelating ligands No of rings denticity 1 5 or 6 membered rings are more stable e g i Pt trien SO denticity 4 chelating rings 3 ii Na Fe OH EDTA denticity of EDTA 5 chelating rings 4

200 ml of 0 005 M AgNO reacts with 300 mL of 0 01 M KCl If K of AgCl is 1 8 x 10 10 Then maximum conc of Ag in mixture is sp 1 2 x 10 8 2 4 5 x 10 8 3 4 8 x 10 5 4 1 34 x 10 5

13 A metal forms two oxides The higher oxide contains 80 metal 0 72 g of the lower oxide gave 0 8 g of higher oxide when oxidised Then the ratio of the weight of oxygen that combines with the fixed weight of the metal in the two oxides will be 1 2 3 2 1 2 4 3 2 3 4 5

During the working of a galvanic cell and with the passage of time 1 Spontaneity of the cell reaction decreases E decreases 2 Reaction quotient Q decreases Ell increases cell 3 Reaction quotient Q increases El decreases 4 At equilibrium Q KE cell 0 eq cell

7 5 g of metal oxide was reduced to 3 4 g of the metal If the gram atomic mass of the metal is 51 g mol then the formula of the metal oxide is 1 MO 3 M O 2 M O3 4 M O5

1 Which of the following will increase the voltage of the cell with following cell reaction Sn 2Ag s Sn 2 2Ag s aq aq 1 Increase in the size of silver rod 2 Increase in the concentration of Sn 2 ions 3 Increase in the concentration of Ag ions 4 Decrease in the concentration of Ag ions

Wave number of a spectral line in the Lyman seri of H atom is 82260 cm 1 Show that this line ha appeared in this series due to the return of th electron from the second to the first orbit

If force of attraction between the electron and nucleus in 2nd orbit of Li isf force of attraction if electron present in 1 orbit of His A f B 12 f C f 81 D 16 f 27

If same energy is supplied to electron in ground state of Hydroger as well as He electron jump to 5th main shell in Hydrogen then final orbit of electron in Het is A 2nd B C 3rd D 4th

What is the entropy change when 1 mole of a monoatomic ideal gas changes volume from 1L to 3L at constant temperature 3R 2 3 3R en 3 1 en3 5R 2 4 R en 3 2 en3

500 mL 4 Calculate the mass of urea NH CONH required in making 2 5 kg of 0 25 molal aqueous solution

min 54 For a first order reaction t 0 A g B g C g a 10 77s 1 mol of SO Cl is denn a x If concentration of A is 0 1 M at 5 sec then from following graph the rate constant is 30 b 5 77 s b 3 47 x 10 d 1 73 x 10 5sec M min M min c 2 3s d 1 1

Calculate the radius of molybdenum atom if the element crystallises as body centered cubic crystals Given density of Mo 10 3 g cm 3 molar mass of Mo 95 94 g mol 1

5 4 3 2 20 Which atoms have undergone a change in the oxidation number in the reaction 2 KCIO3 2 KCl 302 a K and Cl b K and O c Cl and O d K Cl and O 21 The change in the oxidation number of

How much faster would a reaction proceed at 47 C than at 27 C if the activation energy of reaction is 65 kJmol 1 1 2 times 3 11 times 2 5 times 4 16 times