Physical Chemistry Questions

e e 2A s B g C g 2D s E s the degree of dissociation of B was found to be 20 at 300 K and 24 at 500K The rate of backward reaction 1 increases with increase in pressure and temperature 2 increases with increase in pressure and decrease in temperature 3 depends on temperature only and decrease with increase in temperature 4 increases with increase in concentration of B and

14 Suppose that the concentrations of NaF and KCI were 0 10 M and 0 15M respectively in this cell Pb s PbF s F aq Cl aq AgCl s Ag s a Using the half reactions 2AgCl s 2e 2Ag s 2CT E 0 222V and PbF s 2e Pb s 2F E 0 350V calculate the cell voltage b Now calculate the cell voltage by using the reactions 2Ag 2e 2Ag s and Pb 2e Pb s Solubility product constants are Ksp PbF 3 6 x 10 and AgCl 1 8 x 10

7 A 0 6333 g sample of a metal carbonate was reacted with hydrochloric acid A chemical equation for this reaction can be represented as shown below where X is the unknown metal XCO s 2HCl aq XCl aq H O l CO g The carbon dioxide gas generated was collected over water at a temperature of 26 0 C and pressure of 103 80 kPa The final volume of carbon dioxide gas collected was 125 0 mL Determine each of the following a The pressure of the dry gas at this temperature 11 b The moles of carbon dioxide produced 21 c The moles of the metal carbonate reacted 21 d The molar mass of the metal carbonate 17 e The identity of element X and the chemical formula for the metal carbonate 21

71 Acetophenone when reacted with a base C H ONa yields a stable compound which has the strcture CH CH 1 2 OH OH CH CH OH OH 72 The final product C obtained in this reaction 3 CH 4 CH O

58 The equilibrium constant for the following reactions are K and K respectively 2P g 3Cl g 2PCl g PC12 g Cl g PC15 g Then the equilibrium constant for the reaction 2P g 5Cl g a K K c K K 2PC1 g is 2 b K K d K 2K

48 3 V II III I N COL 4 II IV III I II NH pyrrole 1 pyridine II aniline III which is are correct statements 1 I is more basic than II 2 II is more basic than I and III 3 III is more basic than II 4 All are correct IRANDOM TEST

Calculate AG rxn 6H 0 1 6 CO g 2C H 1 80 g given that AG CO g 394 6 kJ mol AG H O I 237 2 kJ mol and AG f C3H O I 154 5 kJ mol Select one 3481 8 KJ 1740 9 kJ 3481 8 kJ 1740 9 kJ

1 0593 g of solid metallic copper is fully reacted with nitric acid to produce copper II nitrate Copper II nitrate reacts with sodium hydroxide according to the following reaction Cu NO3 2 2 NaOH Cu OH 2 some not important side products What volume in mL of 6 0 M sodium hydroxide is required to fully react with the copper II nitrate produced Molar mass of copper 63 546 g mol Report your answer in mL with the correct number of significant digits Number Units

10 30 mg of O is dissolved into a liter of sea water of density 1 03 g mL The concentration of Oz in ppm is 1 8 2 12 3 15 4 10

3 Clean water would have a BOD value of less than 5 ppm 4 Oxides of sulphur nitrogen and carbon are the most wider spread air pollutant 50 If NaCl is doped with 10 mol of SrCl the concentration of cation vacancies will be N 6 02 10 mol 1 6 02x10 mol 2 6 02x10 mol 51 Blood cells retain their normal shape in solution which are 3 6 02x10 mol 1 4 6 02x10 5 mol

From the given equation for a gas at 300 K 4 0 02P 0 001 P Calculate the molecular weight of gas in gm mole at very low pressur where P Pressure is in atm d density is in gm lit Given R 0 08 atm lit mol K

A stream of electrons from heated filament was passed between two charged plates kept at a potential difference V esu If e and m are charge and mass of an electron respectively then the value of h 2 where A is wavelength associated with electron wave is given by 1 2meV 2 meV 3 2 mev 4 meV For a linear plot of log x m versus log p in a Freundlich absorption isotherm which of the following statements is correct k and n are constants

Predict the correct intermediate and product in the following reaction H C C CH Intermediate product X Y 1 H C C CH Y H C C CH OH So 3 H C C CH Y H C C CH OK 2 H C 2 H C C CH Y H CH Y H C C CH 4 H C C CH Y H C C CH SO HO H SO

For of the Original Buffer Solution 1 00 mL 6 00 M NaOH irading 1 point each for the six calculation cells below 6 points total Total Volume of Solution measured NaOH calc d after dilution before neutralization HOAC calc d after dilution before neutralization OAC calc d after dilution before neutralization HOAc calc d after neutralization OAC calc d after netutraliation pH calculated pH measured 32 2 1 33 2 mL 197

The radius of cation is r anion is r Z is nuclear charge of anion Zc is nuclear charge of cation S is screening constant Which of the following is correct TZ S Z S B 220 rc Z S Z S C TZ rc Z S D a Ze TZ

116 Among LiCl BeCl2 BC13 and CC14 the covalent bond character follows the order 1 LiCl BeCl BC1 CCl4 2 LICI BeCl BC13 CC14 3 LiCl BeCl BCl CCl4 4 LICI BeCh BCI CCl4

The second ionisation potentials in electron volts of oxygen and fluorine atoms are respectively give A 35 1 38 3 C 38 3 35 1 D 35 1 35 1 B 38 3 38 3

JEE Mains 20 1 C3H O3 2 C H O 3 C H O The percentage composition of carbon by mole in methane is 1 75 2 80 3 20 Tu 4 C H O JEE Main Online 4 25 molar mass of 1 H 1 g mol and C

45 The rate constant of a reaction is given by K 2 1 x 10 0 exp 2700 RT Correct statement according to this are 23 1 log Kand will be a straight line with slope 1 T 2 The number of effective collisions are 2 1 x 1010 cm sec 3 Half life of the reaction increases with increas temperature 4 None of these

15 Under the same reaction conditions initial concentration of 1 386 mol dm3 of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics respectively Ratio k k of the rate constants for first order k and zero order k of the reactions is 1 0 5 mol dm 2 1 0 mol dm 0 693 3 1 5 mol dm 3 4 2 0 mol dm 2 86 x 1 1 386 4 0 0255 min fraffeatt 1 386 mol dm 40 Fri Fraich k k k 20 A 1 0 5 mot dm 2 1 0 mol dm 3 1 5 mol dm 4 2 0 mot1 dm3 ct kofe no 215

Arrange the elements with the following electronic configurations in increasing order of electron affinity i 1s 2s 2p5 iii 1s 2s 2p a i i iii iv c iii ii iv i ii 1s 2s 2p iv 1s 2s 2p b d ii iii i iv 3s 3p iv iii ii i

Change in volume of the system does not alter the number of moles in which of the following equilibrium Question Type Single Correct Type 1 N g O g 2NO g 2 PCI5 g PCl3 g Cl g 3 N g 3H g 2NH3 g 4 SO Cl g SO g Cl g

3 2 0 of mixture involving Na3PO4 Na2HPO4 or NaH PO4 or involving three of them The solution is titrated with 16 5 mL of 0 5 M HCI to reach bromocresol green end point The same solution is also titrated with 7 6 mL of 0 7 M NaOH to reach phenolphthalein end point What is the composition of that mixture What are the amounts of species in the mixture H 1 0078 0 15 99 Na 22 98 P 30 974

A bubble of air is underwater at temperature 15 C and the pressure 1 5 bar If the bubble rises to the surface where the temperature is 25 C and the pressure is 1 0 bar what will happen to the volume of the bubble AIPMT Mains 2011 1 Volume will become smaller by a factor of 0 70 2 Volume will become greater by a factor of 2 5 3 Volume will become greater by a factor of 1 6 4 Volume will become greater by a factor of 1 1

In water saturated air the mole fraction of water vapour is 0 02 If the total pressure of the saturated air is 1 2 atm the partial pressure of dry air is 1 1 17 atm 2 1 76 atm 3 1 27 atm 4 0 98 atm

If 21 3 mg of metal B was used in the reaction 30 12 mL of H2 gas was produced The pressure of the H2 gas was 650 2 mm Hg Molar mass of metal B 20 9 g mol Determine the temperature of the gas at the time of the reaction in units of K

130 In photoelectric effect the kinetic energy photoelectrons increases linearly with the 1 Wavelength of incident light 2 Frequency of incident light 3 Velocity of incident light 4 Atomic mass of an element 121 01

9 In van der Waals equation at constant temperature 300 K if a 1 4 atm L mol V 100 mL n 1 mole then what is the pressure of the gas a 42 atm c 500 atm b 210 atm d 106 atm 2018

For the reaction 2NO3 g 2NO g O2 g Kc 1 8 x 10 at 184 C R 0 00831 kJ molk When K and Kc are compared at 184 C it is found that 1 Whether K is greater than less than or equal Ke depends upon the total gas pressure 2 K K 3 K is less than K 4 K is greater than Ke 30 A compound A of formula C H Cl on reaction with alkali can give B of formula C H O or C nompound of the formulo C HOC with dilute of formule C H P on oxidation ou

In a hydrogen spectrum if electron moves from 6th to 2nd orbit by transition in multi steps then find out the number of lines in spectrum Total number of line 4 3 2 1 10 n n n 1 6 2 4 1 4 5 2 2 or Total number of lines 2 A certain electronic transition from an excited state to Ground state of the Hydrogen atom in one or more steps gives rise of 5 lines in the ultra violet region of the spectrum How many lines does this transition produce in the Infra red region of the spectrum 5 Lines i a 10

32 The vapour pressures of pure liquids A and B respectively are 600 torr and 500 torr In a binary solution of A and B mole fraction of A is 0 25 then total pressure of the solution in torr will be 1 625 2 530 3 525 4 575

Bond angle between two hybrid orbitals is 105 S character orbital is 1 between 30 31 2 between 19 20 3 between 25 26 4 between 22 23 113

1 0 01 M 2 0 001 M 3 0 1 M 4 0 02 M An excess of AgNO3 is added to 100 mL of a 0 01 M solution of dichlorotetraaquachromium III chloride The number of moles of AgCl precipit AAJ KA TOPPER 3 0 01 would be 1 0 002 2 0 003 4 0 001

Q2A 10 mark A container filled with 35 kg of liquid water at 90 C is placed in a 90 m3 room that is initially at 14 C Thermal equilibrium is established after a while as a result of heat transfer between the water and the air in the room Using constant specific heats determine the entropy generation Assume the room is well sealed and heavily insulated

7 The correct order of the basic strength of methy substituted amines in aqueous solution is 1 CH NH CH NH CH N 2 CH NH CH NH CH s N 3 CH3 3 N CH3NH CH3 2NH 4 CH N CH N CH NH

solution containing 30 g of non volatile solute exactly in 90 g of water has vapour pressure of 2 8 kPa at 298 K Further 18 g of water is then added the solution and the new vapour pressure becomes 2 9 kPa at 298 K Calculat i molar mass of the solute ii vapour pressure of water at 298 K

Osmotic pressure of toluene solution that contains different concentrations of polystyrene is studied at 300K to determine the molecular mass of the polymer It is observed that the osmatic pressure being colligative property changes according to the equation 11 1 2x10 C 24x10 c where osmotic pressure is measured in units of atmospheres concentration C is measured in units of g L For al Calculations R 0 082 atm L mol K Hence molecular mass is obtained as ax10 What is the value of a b to nearest integer

6 Nitrobenzene on reaction with conc HNO3 H SO4 at 80 100 C forms which one of the following products 1 1 3 Dinitrobenzene 2 1 4 Dinitrobenzene 3 1 2 4 Trinitobenzene 1 2 Dinitrobenzene 4

131 A 200 ml flask having oxygen at 220 mm and a 300 mL flask having nitrogen at 100 mm are connected in such a way that O and N may combine in their volumes if temperature is kept constant Find the total pressure of the gaseous mixture 1 158 mm 2 138 mm 3 148 mm 4 168 mm

A cylinder containing an ideal gas 0 1 mol of 1 0 dm is in thermal equilibrium with a large volume of 0 5 molal aqueous solution of ethylene glycol at its freezing point If the stoppers S and S as shown in the figure are suddenly withdrawn the volume of the gas in litres after equilibrium is achieved will be Given Kr water 2 0 K kg mol 1 R 0 08 dm atmk mol 1 1 14 Frictionless piston aq ethylene glycol 2 0 57 3 2 18 4 4 36

3 CH CH CH CH CH C CH CH CH 4 CH CH CH CH CH CH C CH CH CH The hardness of a water sample containing 10 M MgSO expressed as CaCO equivalents in pr is molar mass of CaCO is 100 08 g mol 2 75 1 50 Which 3 90 4 100

Solubility of calcium phosphate molecular mass M in water is W g per 100mL at 20 C its solubility product at 25 C will be approximately AAJ KA TOPPER

A carnot engine has a cycle as given in figure If W and W represent work done by one mole of monoatomic and diatomic gas respectively in the complete cyclic process then W calculate NARAYANA GROUP 4T Ans 3 V To 2 64V

M 2 Solid Ba NO3 2 is gradually dissolved to 1 x 10 Na2CO3 solution At what concentration of Ba precipitation of BaCO3 will start Ksp for BaCO3 5 1 10 Question Type Single Correct Type 1 4 1 x 10 5 M 2 5 1 x 10 5 M 3 8 1 x 10 5 M

109 MY and NY3 two nearly insoluble salts have the same 114 Ksp values of 6 2 x 10 13 at room temperature Which statement would be true in regard to MY and NY3 1 The molar solubility of MY in water is less than that of NY 3 2 The salts MY and NY3 are more soluble in 0 5 M KY than in pure water 3 The addition of the salt of KY to solution of MY and NY will have no effect on their solubilities 4 The molar solubilities of MY and NY3 in water are identical a H O b H O Role of hy respectively 1 oxidizing 2 reducing 3 reducing 4 oxidizing 115

In which of the following reaction the Kolbe s electrolysis product is Incorrectly mentioned 1 2 3 KOOC COOK 4 co COOK COOK COOK Electrolysis COOK Electroly Electrolys

Two beakers of capacity 500 ml were taken One of these beakers labelled as A was filled with 400 mL water whereas the beaker labelled B was filled with 400 ml of 2 M solution of NaCl At the same temperature both the beakers were placed In closed containers of the same material and same capacity as shown in figure A B A C Water At a given temperature which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution B NaCl solution Vapour pressure In container B is more than that in container A Vapour pressure in container B is less than that In container A Vapour pressure Is equal in both ers

n alloy of copper silver and gold is found to have copper constituting the fcc lattice Silver atoms are occupying the edg entres and gold atom is present at body centre If the alloy has empirical formula Cu AgyAuz find value of x y z

A ball is projected at an angle of 45 so as to cross a wall at a distance from the point of projection It falls at a distance b on the other side of the wall If h is the height of the wall then 1 h a 2 2 h b 2 3 h 4 h Tab a b ab a b For 1 M 2 A 3 M 4 N 142 The a ve 1 t

14 Total charge required for the oxidation of two moles Mn304 into MnO in presence of alkaline medium is 1 5F 2 10F 3 20F 4 None of these