Physical Chemistry Questions

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How many coulombs of electricity are required for the oxidation of 1 mole of H O to O 1 9 65 x 104 C 2 4 825 x 105 C 4 1 93 x 104 C 3 1 93 x 105 C
Physical Chemistry
Electrochemistry
How many coulombs of electricity are required for the oxidation of 1 mole of H O to O 1 9 65 x 104 C 2 4 825 x 105 C 4 1 93 x 104 C 3 1 93 x 105 C
A sample of KClO3 on decomposition yielded 224 mL of oxygen gas at NTP Calculate the weight of KCl produced 1 0 496 g 2 0 9937g 4 0 16g 3 1 986 g
Physical Chemistry
General
A sample of KClO3 on decomposition yielded 224 mL of oxygen gas at NTP Calculate the weight of KCl produced 1 0 496 g 2 0 9937g 4 0 16g 3 1 986 g
Approximate atomic weight of an element is 26 89 If its equivalent weight is 8 9 the exact atomic weight of element would be 1 26 89 3 17 8 2 8 9 4 26 7
Physical Chemistry
General
Approximate atomic weight of an element is 26 89 If its equivalent weight is 8 9 the exact atomic weight of element would be 1 26 89 3 17 8 2 8 9 4 26 7
Estimate the lowering of vapour pressure due to the solute glucose in a 1 0 M aqueous solution at 100 C a 10 torr b 18 torr c 13 45 torr d 24 torr
Physical Chemistry
Solutions
Estimate the lowering of vapour pressure due to the solute glucose in a 1 0 M aqueous solution at 100 C a 10 torr b 18 torr c 13 45 torr d 24 torr
VILLUSTRATION 16 The rate of the chemical reaction doubles for an increase of 10K in absolute temperature from 298K Calculate E
Physical Chemistry
Chemical kinetics
VILLUSTRATION 16 The rate of the chemical reaction doubles for an increase of 10K in absolute temperature from 298K Calculate E
The compound exhibiting maximum value of equivalent conductance in a fused state is 3 MgCl 4 BeCl SrCl 2 CaCl
Physical Chemistry
General
The compound exhibiting maximum value of equivalent conductance in a fused state is 3 MgCl 4 BeCl SrCl 2 CaCl
The volume occupied by 7 23 1023 molecules of carbon dioxide and 3 01 x 1023 molecules of Argon at 0 C and 1 atm pressure is a 38 mL c 3 8 x 104 mL b 3 80 L d 3 8 x 103 mL
Physical Chemistry
General
The volume occupied by 7 23 1023 molecules of carbon dioxide and 3 01 x 1023 molecules of Argon at 0 C and 1 atm pressure is a 38 mL c 3 8 x 104 mL b 3 80 L d 3 8 x 103 mL
Problem 5 Calculate the number of molecules present in 350 cm of NH3 gas at 273 K an 2 atmosphere pressure
Physical Chemistry
Gaseous and liquid states
Problem 5 Calculate the number of molecules present in 350 cm of NH3 gas at 273 K an 2 atmosphere pressure
1 NH C During electrolysis of water cost of electricity for the production of X litre H at NTP at cathode is Rs X then cost of electricity for the production X litre O gas at NTP at anode will assume 1 mole of electrons as one unit of electricity 2x 2 4X 3 16X 4 32X
Physical Chemistry
Electrochemistry
1 NH C During electrolysis of water cost of electricity for the production of X litre H at NTP at cathode is Rs X then cost of electricity for the production X litre O gas at NTP at anode will assume 1 mole of electrons as one unit of electricity 2x 2 4X 3 16X 4 32X
1 An aqueous solution of 6 3g of oxalic acid dihydrate is made 13 upto 250 mL The volume of 0 1 N NaOH required to completely neutralise 100mL of this solution is 2 20mL 4 4mL 1 40mL 3 10mL 1
Physical Chemistry
Solutions
1 An aqueous solution of 6 3g of oxalic acid dihydrate is made 13 upto 250 mL The volume of 0 1 N NaOH required to completely neutralise 100mL of this solution is 2 20mL 4 4mL 1 40mL 3 10mL 1
A container contains O and N in equal molar concentration at same temperature what is the corre statement about the average molar kinetic energy of the two gases 1 Depends upon volume 2 KEN KE0 KE 02 4 KEN KEN 3 KEN KE02 1 2
Physical Chemistry
Gaseous and liquid states
A container contains O and N in equal molar concentration at same temperature what is the corre statement about the average molar kinetic energy of the two gases 1 Depends upon volume 2 KEN KE0 KE 02 4 KEN KEN 3 KEN KE02 1 2
A standard hydrogen electrode has zero electrode potential because 1 Hydrogen is easiest to oxidize 2 This electrode potential is assumed to be zero 3 Hydrogen atom has only one electron 4 Hydrogen is the lightest element
Physical Chemistry
Chemical Bonding
A standard hydrogen electrode has zero electrode potential because 1 Hydrogen is easiest to oxidize 2 This electrode potential is assumed to be zero 3 Hydrogen atom has only one electron 4 Hydrogen is the lightest element
For the reaction 2H O 2H O O the rate equation is given as rate k H O T 1 alkaline medium The unit of rate for this reaction is 2 a mol L S c mol L S 1 b mol L s 1 d mol L s 1
Physical Chemistry
Chemical kinetics
For the reaction 2H O 2H O O the rate equation is given as rate k H O T 1 alkaline medium The unit of rate for this reaction is 2 a mol L S c mol L S 1 b mol L s 1 d mol L s 1
For radial function angular function correct option is are A R r determine size of an orbital B angular function determine energy C R r contains n m only D q q contains m
Physical Chemistry
Atomic Structure
For radial function angular function correct option is are A R r determine size of an orbital B angular function determine energy C R r contains n m only D q q contains m
Example 27 What is the temperature coefficient of the reaction if the rate grows 15 6 times when the temperature is increased by 30 K
Physical Chemistry
General
Example 27 What is the temperature coefficient of the reaction if the rate grows 15 6 times when the temperature is increased by 30 K
1 1 point Round off 563 757 to four significant figures Write your answer with four sig figs in a standard number format and using scientific notati 563 757 standard format scientific notation
Physical Chemistry
General
1 1 point Round off 563 757 to four significant figures Write your answer with four sig figs in a standard number format and using scientific notati 563 757 standard format scientific notation
An aqueous solution of CuSO4 measuring 1 L was electrolysed till the pH of the solution was found to be 1 Then the amount of Cu deposited and the volume of gase evolved at STP are respectively Cu 63 5 g mol
Physical Chemistry
Electrochemistry
An aqueous solution of CuSO4 measuring 1 L was electrolysed till the pH of the solution was found to be 1 Then the amount of Cu deposited and the volume of gase evolved at STP are respectively Cu 63 5 g mol
C 50 g of 20 M NaOH dsoln 1 g ml D 50 g of 5m NaOH An organic compound is burnt with excess of O to produce CO g and H O which results in 25 volume contraction Which of the following option s satisfy the given conditions A 10 ml C3H8 110 ml 0 C 10 ml C3H8O 50 ml 0 B 20 ml C HO 80 ml O D 40 ml C H O4 60 ml 0 A sample of H O solution labelled as 56 77 volume has density of 530 g L Mark the correct option s representing concentration of same solution in other units Solution contains only H O and H O
Physical Chemistry
Equilibrium
C 50 g of 20 M NaOH dsoln 1 g ml D 50 g of 5m NaOH An organic compound is burnt with excess of O to produce CO g and H O which results in 25 volume contraction Which of the following option s satisfy the given conditions A 10 ml C3H8 110 ml 0 C 10 ml C3H8O 50 ml 0 B 20 ml C HO 80 ml O D 40 ml C H O4 60 ml 0 A sample of H O solution labelled as 56 77 volume has density of 530 g L Mark the correct option s representing concentration of same solution in other units Solution contains only H O and H O
For a reversible process at T 300K the volume is increased from V 1L to V 10L Calculate AH if the process is isothermal i 2 4 98 kJ 4 11 47 kJ 1 11 47 kJ 30
Physical Chemistry
Energetics
For a reversible process at T 300K the volume is increased from V 1L to V 10L Calculate AH if the process is isothermal i 2 4 98 kJ 4 11 47 kJ 1 11 47 kJ 30
13 For an electron to have the same de Broglie wave length as that of a Deuteron its velocity should be times that of Deuteron 1 1836 2 1 1836 3 3672 4 1 3672
Physical Chemistry
General
13 For an electron to have the same de Broglie wave length as that of a Deuteron its velocity should be times that of Deuteron 1 1836 2 1 1836 3 3672 4 1 3672
ALLUSTRATION 10 Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t 2 3 00 hours What fraction of the sample of sucrose remains after 8 hours
Physical Chemistry
Chemical kinetics
ALLUSTRATION 10 Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t 2 3 00 hours What fraction of the sample of sucrose remains after 8 hours
34 When Hgl is added in KI solution The freezing point of solution 1 increases 2 decreases 3 Remains unchanged 4 Can t predict wol sv
Physical Chemistry
Solutions
34 When Hgl is added in KI solution The freezing point of solution 1 increases 2 decreases 3 Remains unchanged 4 Can t predict wol sv
104 For the reaction H g 1 2O g H O l AC 7 63 Cal deg A H 5 68 3 kCal what H25 C will be the value in kCal of AH at 100 C 1 7 63 x 373 298 68 3 2 7 63 x 10 373 298 68 3 3 7 63 x 10 3 373 298 68 3 lots H 4 7 63 x 373 298 68 3
Physical Chemistry
General
104 For the reaction H g 1 2O g H O l AC 7 63 Cal deg A H 5 68 3 kCal what H25 C will be the value in kCal of AH at 100 C 1 7 63 x 373 298 68 3 2 7 63 x 10 373 298 68 3 3 7 63 x 10 3 373 298 68 3 lots H 4 7 63 x 373 298 68 3
22 An aqueous solution of Na SO4 in water is electrolysed using Pt electrodes The products at the cathode and anode are respectively a H2 SO 2 b O NaOH c H 02 enosups to d O2 SO2 da II a ot the cathode and O g a
Physical Chemistry
Electrochemistry
22 An aqueous solution of Na SO4 in water is electrolysed using Pt electrodes The products at the cathode and anode are respectively a H2 SO 2 b O NaOH c H 02 enosups to d O2 SO2 da II a ot the cathode and O g a
The specific conductance of saturated solution of silver chloride in pure water at 298 K is 1 26 x 10 6 ohm cm higher than that of water used The equivalent conductances at infinite dilution of AgNO3 HNO3 and HCl at this temperature are 132 8 421 2 and 426 9 ohm cm1 respectively Calculate the solubility of AgCl at 25 C Ans 0 001314 g litre
Physical Chemistry
General
The specific conductance of saturated solution of silver chloride in pure water at 298 K is 1 26 x 10 6 ohm cm higher than that of water used The equivalent conductances at infinite dilution of AgNO3 HNO3 and HCl at this temperature are 132 8 421 2 and 426 9 ohm cm1 respectively Calculate the solubility of AgCl at 25 C Ans 0 001314 g litre
Consider the following reaction sequence Sg s 80 g 8SO g 2SO g O g 2SO3 g How many grams of SO are produced from 1 mo Sg 1 1280 g 2 960 g 3 640 g
Physical Chemistry
General
Consider the following reaction sequence Sg s 80 g 8SO g 2SO g O g 2SO3 g How many grams of SO are produced from 1 mo Sg 1 1280 g 2 960 g 3 640 g
2 3 2 Suppose the elements X and Y combine to form two compounds XY and X Y When 0 1 mole of XY2 weighs 10 g and 0 05 mole of X Y weighs 9 g the atomic weights of X and Y are a 40 30 c 20 30 b 60 40 d 30 20
Physical Chemistry
Atomic Structure
2 3 2 Suppose the elements X and Y combine to form two compounds XY and X Y When 0 1 mole of XY2 weighs 10 g and 0 05 mole of X Y weighs 9 g the atomic weights of X and Y are a 40 30 c 20 30 b 60 40 d 30 20
py change for one mole of an ideal gas in an isothermal process at 400 K is 2 8 Cal k mole Given In2 0 7 If process is carried out in a single stop then work done is 600 Cal If process is carried out in a single step then work dono is 1120 Cal Enthalpy is constant for the process If the above process is carried out in vacuum then entropy change is zero CODE
Physical Chemistry
Electrochemistry
py change for one mole of an ideal gas in an isothermal process at 400 K is 2 8 Cal k mole Given In2 0 7 If process is carried out in a single stop then work done is 600 Cal If process is carried out in a single step then work dono is 1120 Cal Enthalpy is constant for the process If the above process is carried out in vacuum then entropy change is zero CODE
2 24 A solution of weak acid HA was titrated with base NaOH The equivalence point was reached when 36 12 ml of 0 1 M NaOH has been added Now 18 06 ml of 0 1 M HCl were added to titrated solution the pH was found to be 4 92 What will be the pH of the solution obtained by mixing 10 ml of 0 2 M NaOH and 10 ml of 0 2 M HA N u H NAA Hce 18 06X0 10 va 20 MA
Physical Chemistry
Equilibrium
2 24 A solution of weak acid HA was titrated with base NaOH The equivalence point was reached when 36 12 ml of 0 1 M NaOH has been added Now 18 06 ml of 0 1 M HCl were added to titrated solution the pH was found to be 4 92 What will be the pH of the solution obtained by mixing 10 ml of 0 2 M NaOH and 10 ml of 0 2 M HA N u H NAA Hce 18 06X0 10 va 20 MA
x24 is a radioactive substance and it decomposes by a decay into stable pb306 The half life of decay of X into Pb is 138 6 days If 1 mole of X is placed in a closed tube then in 69 3 days the amount of a particle in moles accumulated in the tube is approx O 1 mole O 06 moles O 2 moles O 24 moles
Physical Chemistry
Chemical kinetics
x24 is a radioactive substance and it decomposes by a decay into stable pb306 The half life of decay of X into Pb is 138 6 days If 1 mole of X is placed in a closed tube then in 69 3 days the amount of a particle in moles accumulated in the tube is approx O 1 mole O 06 moles O 2 moles O 24 moles
451 P The vapour pressure of pure A is 10 torr and the same temperature when 1 g of B is dissolved in 20 gm of A its vapour pressure is reduced to 9 0 torr If the molecular mass of A is 200 amu then the molecular mass of B is 1 100 amu 3 75 amu 2 90 amu 4 120 amu
Physical Chemistry
Solutions
451 P The vapour pressure of pure A is 10 torr and the same temperature when 1 g of B is dissolved in 20 gm of A its vapour pressure is reduced to 9 0 torr If the molecular mass of A is 200 amu then the molecular mass of B is 1 100 amu 3 75 amu 2 90 amu 4 120 amu
At 300 K the two solutions of glucose A and B with respective concentrations 0 1 M and 0 01 M are separated by semipermeable membrane How much external pressure need to be applied and on which solution so as to preven osmosis 1 0 2463 atm pressure is applied on solution B 2 2 217 atm pressure is applied on solution A 3 0 0246 atm pressure is applied on solution B 4 0 0217 atm pressure is applied on solution A
Physical Chemistry
Solutions
At 300 K the two solutions of glucose A and B with respective concentrations 0 1 M and 0 01 M are separated by semipermeable membrane How much external pressure need to be applied and on which solution so as to preven osmosis 1 0 2463 atm pressure is applied on solution B 2 2 217 atm pressure is applied on solution A 3 0 0246 atm pressure is applied on solution B 4 0 0217 atm pressure is applied on solution A
Molarity of 29 W density is 1 22 g ml is 1 1 8 M 29 1000 X 98 14 75 2 3 6 M 3 2 4 M 4 1 2 M 29 98 H SO4 solution whose NCERT Pg 23 1 22 18 18000x10 122
Physical Chemistry
General
Molarity of 29 W density is 1 22 g ml is 1 1 8 M 29 1000 X 98 14 75 2 3 6 M 3 2 4 M 4 1 2 M 29 98 H SO4 solution whose NCERT Pg 23 1 22 18 18000x10 122
In which molecule ion central atom has 3 formal charge 1 0 3 NO 2 N 4 all
Physical Chemistry
General
In which molecule ion central atom has 3 formal charge 1 0 3 NO 2 N 4 all
Calculate the total pressure in a 10 litre cylinder which contains 0 4 g of helium 1 6 g of oxygen and 1 4 g of nitrogen at 27 C Also calculate the partial pressure of helium gas in the cylinder As sume ideal behaviour of gases Given R 0 082 li tre atm K 1 mol 1
Physical Chemistry
Gaseous and liquid states
Calculate the total pressure in a 10 litre cylinder which contains 0 4 g of helium 1 6 g of oxygen and 1 4 g of nitrogen at 27 C Also calculate the partial pressure of helium gas in the cylinder As sume ideal behaviour of gases Given R 0 082 li tre atm K 1 mol 1
4 Figure shows wave fronts in still water moving in the direction of the arrow towards the interface PQ between a shallow region and a deep denser region Which of the lines shown may represent one of the wave fronts in the deep region P shallow deep IV III II I Q
Physical Chemistry
General
4 Figure shows wave fronts in still water moving in the direction of the arrow towards the interface PQ between a shallow region and a deep denser region Which of the lines shown may represent one of the wave fronts in the deep region P shallow deep IV III II I Q
Question A 0 141g sample of a phosphorus containing compound was digested in a mixture of HNO3 and H SO4 which resulted in formation of CO H O and H PO4 Addition of ammonium molybdate yielded a solid having the composition NH4 3 PO4 12 MoO3 The precipitate was filtered washed and dissolved in 50 0 mL of 0 20M NaOH 56 57 58 NH4 3PO4 12 MoO3 s 260H HPO 2 12M002 14H O 3NH g After boiling the solution to remove the NH3 the excess NaOH was titrated with 14 1 mL of 0 174M HCI The reacted milli moles of NaOH with solid having composition NH4 3PO4 12 MoO3 is A 7 55 B 5 75 C 6 65 D 8 25 Produced mole of NH3 is A 7 62 x 10 3 B 8 71 x 10 4 C 6 85 10 3 The percent of phosphorous in the given sample is B 5 56 A 3 36 C 6 38 D None of these D 7 25
Physical Chemistry
General
Question A 0 141g sample of a phosphorus containing compound was digested in a mixture of HNO3 and H SO4 which resulted in formation of CO H O and H PO4 Addition of ammonium molybdate yielded a solid having the composition NH4 3 PO4 12 MoO3 The precipitate was filtered washed and dissolved in 50 0 mL of 0 20M NaOH 56 57 58 NH4 3PO4 12 MoO3 s 260H HPO 2 12M002 14H O 3NH g After boiling the solution to remove the NH3 the excess NaOH was titrated with 14 1 mL of 0 174M HCI The reacted milli moles of NaOH with solid having composition NH4 3PO4 12 MoO3 is A 7 55 B 5 75 C 6 65 D 8 25 Produced mole of NH3 is A 7 62 x 10 3 B 8 71 x 10 4 C 6 85 10 3 The percent of phosphorous in the given sample is B 5 56 A 3 36 C 6 38 D None of these D 7 25
If you add a 120 C platinum piece with a mass of 2 34 g c 0 126 J g C to 100 g of 5 2 C water in a calorimeter that will absorb no heat What is the final temperature of the water
Physical Chemistry
Energetics
If you add a 120 C platinum piece with a mass of 2 34 g c 0 126 J g C to 100 g of 5 2 C water in a calorimeter that will absorb no heat What is the final temperature of the water
a In non reacting condition O Valency factor Total number of positive charge or negative charge present in the compou Solved Examples e 5 Na CO3 Fe SO4 3 FeSO 7H O
Physical Chemistry
General
a In non reacting condition O Valency factor Total number of positive charge or negative charge present in the compou Solved Examples e 5 Na CO3 Fe SO4 3 FeSO 7H O
9 Heat of formation of benzene assuming no resonance Given that BE C C 83 kcal BE C C 140 kcal BE C H 99 kcal Heat of atomisation of C 170 9 kcal Heat of atomisation of H 104 2 kcal will be 1 39 kcal 3 1263 kcal 2 75 kcal 21 kool
Physical Chemistry
Energetics
9 Heat of formation of benzene assuming no resonance Given that BE C C 83 kcal BE C C 140 kcal BE C H 99 kcal Heat of atomisation of C 170 9 kcal Heat of atomisation of H 104 2 kcal will be 1 39 kcal 3 1263 kcal 2 75 kcal 21 kool
a 26 93 J K D For a perfectly crystalline solid C p m molar entropy at 20 K is a 0 42 J K mol aT where a is constant If p m 1s 0 42 J K mol at 10 b 0 14 J K mol c 1 12 J K mol d zero
Physical Chemistry
General
a 26 93 J K D For a perfectly crystalline solid C p m molar entropy at 20 K is a 0 42 J K mol aT where a is constant If p m 1s 0 42 J K mol at 10 b 0 14 J K mol c 1 12 J K mol d zero
What is the ApH final inital for 1 3 2 3 stages of neutralization of 0 1 M CH COOH with 0 1 M Na 1 2log 2 2 2 log 3 4 2 log 2 3 3 2 log 1 4
Physical Chemistry
General
What is the ApH final inital for 1 3 2 3 stages of neutralization of 0 1 M CH COOH with 0 1 M Na 1 2log 2 2 2 log 3 4 2 log 2 3 3 2 log 1 4
31 The emf of the ceil Pt H HA HC H Pt is 0 295 V Dissociation constant of the acid HA 0 01 M IM 1 atm 1 1x 104 3 1 x 10 2 1 x 10 6 4 1 x 10 5
Physical Chemistry
Electrochemistry
31 The emf of the ceil Pt H HA HC H Pt is 0 295 V Dissociation constant of the acid HA 0 01 M IM 1 atm 1 1x 104 3 1 x 10 2 1 x 10 6 4 1 x 10 5
At 30 C K for the dissociation reaction SO CL g SO g Cl g is 2 9 x 10 2 atm If the toal pressure is 1 atm the degree of dissociation of SO Cl is
Physical Chemistry
Equilibrium
At 30 C K for the dissociation reaction SO CL g SO g Cl g is 2 9 x 10 2 atm If the toal pressure is 1 atm the degree of dissociation of SO Cl is
For the decomposition N O N O 1 2 O the initial pressure of N O5 and after 20 s the pressure of reaction mixture becomes 133 mm Calculate the rate of reaction in terms of a change in atm s and b change in molarity s Given that reaction is carried out at 127 C is 114 mm 114 N O N O 1 2 02 2 g
Physical Chemistry
Chemical kinetics
For the decomposition N O N O 1 2 O the initial pressure of N O5 and after 20 s the pressure of reaction mixture becomes 133 mm Calculate the rate of reaction in terms of a change in atm s and b change in molarity s Given that reaction is carried out at 127 C is 114 mm 114 N O N O 1 2 02 2 g
Half liter of perhedral releases V liters of oxygen at 1 atm and 273K The value of V 50
Physical Chemistry
General
Half liter of perhedral releases V liters of oxygen at 1 atm and 273K The value of V 50
ATOMIC STRUCTURE In hydrogen atom the kinetic energy of electron is 3 4 eV The distance of that electron from the nucleus 2 0 529A 4 21 16A 1 2 116A 3 1 587A
Physical Chemistry
Atomic Structure
ATOMIC STRUCTURE In hydrogen atom the kinetic energy of electron is 3 4 eV The distance of that electron from the nucleus 2 0 529A 4 21 16A 1 2 116A 3 1 587A
upto 2 10 electrons 4 6 electrons A d orbital can accomodate 1 5 electrons 3 2 electrons
Physical Chemistry
General
upto 2 10 electrons 4 6 electrons A d orbital can accomodate 1 5 electrons 3 2 electrons
The absolute value of enthalpy of a system cannot be determined experimentally According to the definition
Physical Chemistry
Gaseous and liquid states
The absolute value of enthalpy of a system cannot be determined experimentally According to the definition
49 What is the IUPAC name for the following compound a 5 methylcyclohexene 1 methyl 3 cyclohexene c CH3 b 4 methylcyclohexene d 1 methyl 4 cyclohexe
Physical Chemistry
General
49 What is the IUPAC name for the following compound a 5 methylcyclohexene 1 methyl 3 cyclohexene c CH3 b 4 methylcyclohexene d 1 methyl 4 cyclohexe