Physical Chemistry Questions

75 Which is correct for following transition E E E 2 1 E3 1 E3 2 E 1 2 2 2 3 v V V 4 all of these 76 Consider three electra 2 2 3 40 1 25 2065 I 6x5 18 1071 9 75 E E E 2 1 E3 1 E3 12 21 2 3 V3 V V 4 2 0 54 0 62 3 4 2 13 1 21

36 A ball of mass 0 2 kg is is thrown vertically upward by applying a force by hand The hand moves 0 2 m while applying the force and the ball goes up to 2 m height up What is the force if the value of G 10 m s A 22N B 16 N C 4 N D 20 N

88 The degree of unsaturation of molecular formula CH NOBIC 88 CH NOBRC 3 4 6 is 1 1 2 2 3 3 4 4 16 5 42 2 16 12 2 5 2 1 2 15 2 2 1 1 2 2 3 3 4 4

4 8 x 1045 1 1 43 35 X103 3 5 x 10 45 1 4 8 x 10 5 1 2 30 2 log log A 29 64 The degree of dissociation a of PCI obeying the 64 3 PCI PCl3 Cl feu farien an af equilibrium PCI PCI3 Cl is related to the pressure at equlibrium by 1 a 1 a 1 1 Kp 0 B do 2 p 1 x P 1 2 x JP 1 3 x 1 1 2 a p 2 x 4 8 1 P 1 11 00 11 255 1 x P 3 0 1 A 35 X 10 2 3 X 2221 46

Example 13 87 cm of moist nitrogen is measured at 9 C and 659 mm Hg pressure Find the volume of dry nitrogen at S T P The vapour pressure of water at 9 C is 9 mm Hg Solution Pressure due to dry nitrogen alone 659 9 650 mm Hg P 650 mm V 87 cm T 273 9 K P 760 mm V cm T 273 K By the gas equation P V P2 V 2

3 4 1 4 2 1 68 The gas phase reaction 2NO g exothemic reaction The decomposition of N O4 in equilibrium mixture can be increased by 1 Addition of an inert gas at constant pressure 2 Lowering the temperature 6 3 Increasing the pressure 4 Addition of an inert gas at constant volume 40 PA PB IXA 2 1 4 3 4 1 4 2 1 28 Dout MB N O4 g is an 68 NO g 4H he 2 3 Gld an act 4 FRO PINGO N 04 9 3047 27 0 fact I GI 41 FOR SRI vf 50 32 87 5

If a galvanic cell is represented as Mg Mg 1M Fe 1M Fe s Then the reaction takes place at right hand half cell is 1 Mg s Mg2 aq 2e 3 Fe s Fe aq 2e 2 Fe aq 2e 4 Mg aq 2e Fe s Mgs

a c 20 F 37 If Efe Fe X V E a C 2x x 4 2x x 2 d None of these Fe Fe2 X2 V what is the E 2x x 3 d 2x x b

6 02 x 1024 electrons are passed through aqueous CuSO solution using iner electrodes Then the weight of copper deposited at cathode is 8 AW 63 5 1 635 2 317 5 3 63 5 4 31 75

4 4 2 89 The number of structural isomers possible with molecular 89 CH FRAICHE THIRDIRI CU 8 2 6 C X formula C H is X17 2 8 3 9 4 10 8 2 6 2 C C CEC C C G C 2 coge C C C actc 3 3 4 4 16 1 7 2 8 3 9 4 10 CEC C C 2 C C C 3 2X4 2 6 2 C CFC C fr C C C C

49 Find the ratio of the masses if a light string passing over a smooth light pulley connects two blocks of masses m1 and m2 vertically Given that acceleration of the system is g 8 A 9 7 B 1 8 C 7 4 D 3 5

143 What is the concentration of Ba2 when BaF2 Ksp 1 0 x 10 6 begins to precipitate from solution that is 0 30 M F a 9 0 10 7 b 3 3 x 10 5 c 1 1x10 5 144 Solubility of AgCl in 0 2 M NaCl is x and that in 01 MANO is y then which of the followi d 3 0 10 7

4 6 023 x 1019 54 Calculate the partial pressure of CO from the following 54 rafetera T HET CO 112 T3 4 6 023 1019 simultaneous equilibirium CaCO s CO g C 2CO g Kp 2 1 0 2 2 0 4 CaO s CO g Kp 8 102 3 1 6 4 4 Oml of conc H SQ 18 molar fanfarg CaCO s CaO s CO g Kp 8 102 CO g C 2CO g Kp 2 1 0 2 270 4 3 1 6 2 4 8 X10 2 16 X16

Which of the following factors decide whether reaction will be elimination versus substitution A A Bulkier nucleophile will prefer to act as a base and abstracts a proton rather than approach a tetravalent carbon atom B High temperatures generally are favourable for elimination reaction C A tertiary halide goes for SN 1 or elimination depending on stability of carbocation or the more substituted alkene formed as product D A secondary halide decides SN2 or E based on relative strength as a base Nucleophile of the reagent

P Two identical bulbs containing ideal gases A and B are taken 67 A Density of A is twice that of B Mol wt of A is half that of B If the two gases are at the same temperature the ratio of pressure of A and B is 1 1 2 2 1 4 3 4 1 4 2 1 P PA PB SRR MW 21 IXA B B 1 1 2 2 1 4 lass XIII Spartan A 25 3 4 1 4 2 1 The gas phase reaction 2NO g N O g is an 68 taff N MB B S MB

Simplified absorption spectra of three complexes i ii and iii of M ion are provided below their max values are marked as A B and C respectively The correct match between the complexes and their max values is Absorption B M A max max Wavelength nm JEE Main 2020 2 September Shift II ii MF 6 n M NCS 61 6 1 i iii M NH3 61 max a A iii B i C ii R ii C 1 b A ii B i C iii d A i B ii C iii

The conductivity of 0 02 M a weak acid HX is 8 x 10 conductances of H and X ions are 350 and 50 Then the degree of dissociation of HX under these experimental conditions is S cm The limiting molar ohm cm mol respectively 1 0 156 2 0 24 3 0 065 4 0 1

4 All of these Consider the following equilibrium in a closed container N O g 2NO g At a fixed temp the volume of the reaction container is halved for this change which of the following statements held true regarding the equilibrium constant K and degree of dissociation a 1 Neither K nor a changes 2 Both K and a changes 3 K changes but a does not change 4 K does not change but a changes For an equilibrium H O s H O which of

6 Calculate heat capacity of 40 gm triatomic nonlinear gas M 20 gm mol If it is subjected to a process such that pressure exerted is directly proportional to square of volume at under normal conditions 10 C R 20 B R D

4 10 18 48 A precipitate of CaF2 Ksp 1 7x10 10 will be obtained 48 when equal volume of the following are mixed 1 10 4M Ca and 10 4 MF 2 10 2M Ca and 10 3 MF 10 5M Ca and 10 3 MF 264 10 M Ca2 and 10 5 MF 1XFX018 3 10 10 4 10 18 10 X 4 X 10 49 pk values of two acids A and B are 4 and 5 The strength 4x158 fuc un Buda F 1 10 M Ca en 10 4MFX 210 2M Ca 7 10 3MF 3 10 5M Ca 2 4 10 M Ca 10 MF 105 MF OF 10 78 Ca K 1 7x10 1 0 sp 108 10 4 x 4x10 8

The next problem involves directions in the form of bearing which we defined in this section Remember bearing is always measured from a north south line Round all answers to the nearest integer A boat leaves the harbor entrance and travels 26 miles in the direction N42 E The captain then turns the boat 90 and travels another 23 miles in the direction S48 E At that time how far is the boat from the harbor entrance and what is the bearing of the boat from the harbor entrance Distance from the harbor Roaring from the harbor S miles o W

The flocculation value of HCI for Arsenic sulphide sol is 30 m mol 1 If H SO4 is used for the flocculation of Arsenic sulphide the amount is gramsH2 SO4 of in 250ml required for above purposes is 0 72 0 18 1 44 0 37

Read the following statements A IP of O g is less than I P of O B I P of Ne g is greater than E A of Net C E A of O g is greater than E A of O D LP of N g is greater than I P of N The correct statements are Select one a A B C D b C D c B C D d A B D bij 19

10 Silver nitrate solution is gradually added to an aqueou solution containing 0 01 M each of chloride bromide and iodide ions The correct sequence in which the halides wi be precipitated is 1 Bromide chloride iodide 2 Iodide chloride bromide 3 Iodide bromide chloride 4 Bromide chloride

50ml of 0 1M CUSO4 solution is electrolysed by using pt electrodes with a current of 0 965 ampere for a period of one minute Assume volume of solution does not change during electrolysis 33 Concentration of H after Jootrolvain in

A solution containing 0 1 mole of glucose in water freezes at 0 2 C The amount of water present in this solution is K H O 1 86K molal O930 g O 1000 g O 90 g 210 g

de potential for the reaction Ag aq e Ag s Sn aq 2e Sn s at 25 C are 0 80 volt and 0 14 volt respectively The emf of the cell Sn Sn 1M Ag 1M Ag is 1 0 66 volt 2 0 80 volt 3 1 08 volt 4 0 94 volt At 25 C Ag NH3 e Ag s 2NH E 0 02V 46 25 C Ag aq e Ag s Sn aq 2e Sn s af 0 80 Sn Sn 1M Agt 1M Ag Oxi 1 0 66 volt 2 0 80 volt 3 1 08 volt 4 0 94 volt 47 25 C T PCB 7 to 9 0 14are EMF 0 80 8 79 0

INSTITUTE 79 Angular momentum of electron for hydrogen in second orbit 79 El 24 at se en la tiam ante durant is x then it will be for Li 2 in Ist excited state Class XI Marcel Batch Atomic Structure A B C 1 3x 2 9x 1 3x 2 9x 3 x 2 XX 3 x 2 80 If the kinetic energy of a particle is double 1 2 N EV

X 3X10 A Joom G 1 only a b c 2 only b c d 3 only a b d 4 a b c and d 50 What is the energy of photon which wave number is 10 cm 1 60 10 cm 1 8 x 10 24 J 662xX10 34 2 6 x 10 23 J 3 4 x 10 20 J 4 2 x 10 22 6 62 10 37 1926 F 6 62X 1 2 3 x10 cm a b c b c d a b d 4 a b c d 1 8 x 10 24 J 2 6 10 23 J 3 4 x 10 20 J 4 2 x 10

Certain quantity of electricity deposits 3 6 g of Al AW 27 from molten AlCl Then the weight of Ag AW 108 deposited by passing same quantity of electricit through aqueous AgNO3 solution is 1 43 2 2 32 4 3 14 4 4 28 8

You could add solid KCl to the solution to precipitate out AgCl s What mass of KCl is needed to precipitate the silver ions from 12 0 mL of 0 240 M AgNO3 solution Express your answer with the appropriate units V

34 When lead II nitrate is heated it decomposes into lead II oxide and two gases Nitrogen dioxide gas and oxygen gas are released What is the coefficient of nitrogen dioxide upon balancing the chemical reaction A 3 B 2 C 4 D 1

81 SCQ If the ionic potential of ions is in the order M M Mand b polarizability of ions is in the order x y z Select the combination of ions having more covalent character as compared to My b A B en Max Mez Correct Answer

e Hardy Schulze rule Among Al2 SO4 3 and NH4 3PO4 which is better pagulating agent for a negative sol In the coagulation of negative sol arrange the following in ascending order of their Flocculating power Ba2 Na Al AS2S3 sol is negatively charged Between sodium nitrate and aluminium nitrate which one is needed in larger quantity to coagulate the above sol What in

8 A gaseous compound A reacts by three independent first order processes as shown in figure with rate constant 2 10 3 10 and 1 93 10 sec for products B C and D respectively If initially pure A was taken in a closed container with P 8 atm then the partial pressure of B in atm after 100 sec from start of experiment 1 0288 A g k k k3 2 B g C g D g 0 577

On this transformation PC15 PCI What change will take place A Hybridisation of P will change B Regular geometry changes C Shape of molecule changes 3 All of these Correct Answer

Which of the following conservation of mass illustrates the law of a Mixing of 10 g of sulphur and 2 g of sand does not show a change in mass b the mass of platinum wire before and after heating remains constant c 2 2 g of propane and 8 g of oxygen produces 10 2 mg of gaseous mixture d 2 8 g of CO and 1 6 g of oxygen gave only 2 24 L ot

A solution is 0 30M in Ag and 0 050M in Ba2 If solid Na SO4 is added which will precipitate first Ag2SO4 Ksp 1 2 x 10 5 or BaSO4 Ksp 1 5 x 10 ii specify the concentration of SO4 2 needed to begin precipitation Question e options Ag2SO4 neither will precipitate as sodium salts are soluble BaSO4 both will precipitate simultaneously please help answer all parts please will rate good

2 CH AIF 3 SF CL OX 4 IF PCI5 f 50 The electronic structure of four elements a b c and d are 50 a 1s b 1s 2s 2p c 1s 2s 2p5 d 1s 2s 2p6 The tendency to form electrovalent bond is greatest in 1 a 2 b 3 C B B 1 B H AICI 2 CH AIF 3 3 SF CI O 4 IF PCI a b cada a 1s c 1s 2s 2p5 1 a 2 b 3 c FA b 1s 2s 2p d 1s 2s 2p af f na

c The rate of a first order reaction is 0 04 mol s at 10 seconds and 0 03 mol s at 20 seconds after initiation of the reaction The half life period of the reaction is 2016 a 24 1s b 34 1 s d 54 1s c 44 1s fa catalyst during a chemical an P At

The hemoglobin from the red corpuscles of most mammals contains about 0 33 iron Physical measurement indicate that hemoglobin is a very large molecule with a molar mass of about 6 8 x 104 g mol How many iron atoms are there in one molecule of hemoglobin

Excess of Kl and dil H SO4 were mixed in 50 ml o H O The 1 liberated requires 20 ml of 0 1 N Naz S 0 The strength of H O is 1 0 68 g liter 2 0 58 g liter 3 48 g liter 4 38 g liter

EAIA B B Ec 0 3V Ep 0 1V D D Based on above data select correct statement under standard condition Best oxidising agent is A Best reducing agent is D C can displace D from it s solution In galvanic cell obtained by electrodes A B current flow from B to A in external circuit 1

8 pH for the solution of salt undergoing anionic hydrolysis say CH3COONa is given by 1 pH 1 2 pKw pK log C a 2 pH 1 2 pKw pKa log C W 3 pH 1 2 pKw pk log C 4 None of these

The rechargeable cells used in calculators and battery operated tools are based on nickel and cadmium electrodes It may involve which of the following cell reactions to make cell reaction spontaneous Cd s 20H aq Cd OH 2e E 0 40 V OXI Ca OH 2e Cd s 2OH aq E 0 40 V 2Ni OH s 20H aq 2NiO OH s 2H O l 2e E 0 49 V 2NiO OH s 2H O 1 2e 2Ni OH s 2OH aq Ed 0 49 V

2 What will be standard cell potential of galvanic cell with the following reaction 2Cr s 3Cd aq 2Cr aq 3Cd s Given E C Cr 0 74 V and E Ca Ca 0 40 V a 0 74 V b 1 14 V c 0 34 V d 0 34 V

The effective nuclear charge experienced by a valence electron in an atom will be less than the actual charge on the nucleus because of the shielding or screening of valence electron from the nuclecus by intervening core electrons

1 Over the years the thermite reaction has been used for welding railroad rails in incendiary bombs and to ignite solid fuel rocket motors The reaction is Fe O s 2Al s 2Fe Al O s How much Aluminium oxide would be produced if the yield were 93 and iron in iron oxide is 15 g A 12 7 g 13 5 g C 27 g 14 6 g B D

Which of the following reaction involve in Bosch s process used for the manufacturing of H 1 CH3OH 400 C 4 C H6 CO 2H catalyst 2 H CO H O CO 2H 3 3Fe 4H O Fes O4 4H Cracking 2C 3H

Match the column for B2H6 Column l A Maximum atom in same plane B 3C 2e bonds C Maximum replacable H atoms D Boron atoms which follow octete rule A A S B P C Q D R Contect Answer B A R B Q C S D P Column II P 0 Q 2 R 6 S 4 C CA R B S C P D Q 3