Physical Chemistry Questions
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Physical Chemistry
GeneralThe concentration of H and concentration of OH of a 0 1 aqueous solution of 2 ionised weak acid is Ionic product of water 1 10 4 CBSE PMT 1999 DPMT 2004 a 2x10 M and 5x10 M b 1x10 M and 3 10 M c 0 02x10 M and 5 10 11 M d 3x10 2 M and 4x10 13 M
Physical Chemistry
Equilibrium0 The total number of different kind of acidic buffers obtained during the titration of H PO with NaOH are A 3 B 1 C 2 D 0
Physical Chemistry
General31 12 grams of a mixture of sand and calcium carbonate on strong heating produced 7 6 grams of residue How many grams of sand is present in the mixture SERIES for Sri Chaitanya 23
Physical Chemistry
Atomic StructureElement A has 3 electrons in the outermost orbit and element B has 7 electrons in the outermost orbit The formula of the compound formed between A and B would be 1 A B3 3 A B 2 A3B6 4 AB3
Physical Chemistry
EquilibriumThe solubility of a salt of weak acid AB at pH 3 is Y x 103 mol L The value of Y is Given that the value of solubility product of AB Ksp 2 x 10 10 and the value of ionization constant of HB K 1 10 2018
Physical Chemistry
Equilibrium39 The yield of product in the reaction 2A g B g would be lower at A low temperature and low pressure C low temperature and to high pressure IIZI co pageno 1 2C g QkJ B high temperature high pr D high temperature low pre
Physical Chemistry
GeneralA 10 cm air column is trapped inside the tube having uniform area of cross section by 6 cm of Hg and is placed horizontally to the plane Calculate the length of air column when the tube is placed vertically with opened end up 1 9 26 cm 2 10 cm 3 10 25 cm 4 11 5 cm
Physical Chemistry
Equilibrium46 If pK for CN at 25 C is 4 7 The pH of 0 5M aqueous NaCN solution is 1 12 2 10 3 11 5 4 11
Physical Chemistry
Atomic Structure79 Observe the given boundary surface diagrams of two orbitals I and II and choose the correct option Z II I d22 II dyz b I d II d a I d c I I dz II d yz II d d I dxy II dxz
Physical Chemistry
Solutions10 101 ei nijulpe to jaio emilion The cryoscopic constant for acetic acid is 3 6 K kg mol A solution of 1 g of a hydrocarbon in 100 g of acetic acid freezes at 16 14 C instead of the usual 16 60 C The hydrocarbon contains ositib 0 C01 di noitu 92 3 carbon What is the molecular formula 10120 0 70m
Physical Chemistry
SolutionsOn adding a non volatile solute to a solvent the vapour pressure of solvent decreases and becomes z x vapour pressure of solvent where z is 1 mole fraction of solvent 2 mole fraction of solute 3 molality 4 molarity
Physical Chemistry
EquilibriumThe enthalpy change for a reaction does not depend upon a use of different reactants for the same products b the nature of intermediate reaction steps c the differences in the initial and final temperatures of involved substances d the physical sate of reactants and products
Physical Chemistry
Chemical kinetics3 When weak acid is titrated with strong base then pH before after reaching end point respectively 1 pK pK pK salt acid 2 pK log PK 3 7 PK logc pk log salt 4 pK log cid a salt acid 1 7 pK logc
Physical Chemistry
Surface chemistry03 Addition of lyophilic solution to the emulsion forms a a protective film around the dispersed phase b a protective film around the dispersion medium c an aerosol d true solution 16 or
Physical Chemistry
ElectrochemistrySpecific conductivity of a solution a increases with dilution b decreases with dilution c remains unchanged with dilution d depends on mass of electrolyte cot
Physical Chemistry
Gaseous and liquid statesThe temperature at which intermolecular attraction force balance the intermolecular repulsion force is known as 1 Boyle temperature in 2 Critical temperature 3 Boiling temperature 4 Equilibrium temperature
Physical Chemistry
General5 An organic compound on analysis gave C 54 2 H 9 2 by mass Its empirical formula is a CHO CH 0 c C H O C H O The relative number of atoms of elements X and Y in b d
Physical Chemistry
GeneralD Volume of a tyre 10 litre when inflated The tyre is inflated to a pressure of 3 atm at 17 C with air Due to driving the temperature of tyre increases to 47 C a What would be the pressure at this temperature b How many litre of air measured at 47 C and pressure of 1 atm should be let out to restore the tyre of 3 atm at 47 C
Physical Chemistry
General7 Formation of ethane from calcium carbide takes place as follows CaC 2H O Ca OH C H C H 2H C H6 The amount of ethane gas obtained from 72 kg of water is 1 60 kg 3 40 kg 2 20 kg 4 52 kg
Physical Chemistry
General8 A completely filled d orbital d 0 is of a spherical symmetry b octahedral symmetry c tetrahedral symmetry d unsymmetry
Physical Chemistry
General1 10 mL of 1 mM surfactant solution forms a monolayer 2 covering 0 24 cm on a polar substrate If the polar head is approximated as a cube what is its edge length 2019 Main 9 April II d 2 0 nm a 2 0 pm b 0 1 nm c 1 0 pm
Physical Chemistry
Energetics35 Ammonium chloride when dissolved in water leads to cooling sensation The dissolution of NH Cl at constant temperature is accompanied by 1 Increase in entropy 2 Decrease in entropy 3 No change in entropy 4 No change in enthalpy
Physical Chemistry
Solid stateIn a face centered lattice with all the positions occupied by A atoms the body centered octahedral hole in it is occupied by an atom B of appropriate size For such a crystal calculate the void space per unit volume of unit cell Also predict the formula of the compound
Physical Chemistry
Atomic Structure7 Which d orbital has different shape from rest of al d orbitals 16 ertainty of b da d day or dys
Physical Chemistry
Surface chemistry7 Air can oxidize sodium sulphite in aq solution but cannot do so in the case of sodium arsenite If ids however air is passed through a solution containing both sodium sulphite sodium arsenite then bot are oxidized This is an example of 1 Positive catalysis 2 Negative catalysis 4 Auto catalysis 3 Induced catalysis
Physical Chemistry
ElectrochemistryAH 298 2 kJ SO3 AH 98 7 kJ H SO4 AH 130 2 kJ H O AH 287 3 kJ If S O SO SO2 2 02 SO3 H O H 2 0 Then the enthalpy of formation of H2SO4 at 298 K will be a 814 4 k c 650 3 kJ b 320 5 kJ d 933 7 kJ
Physical Chemistry
GeneralA B C and D are four metals A can displace D from its salt solution but B and C cannot displace D B can displace hydrogen H for a dilute solution of a mineral acid but C cannot The reduction potentials of A B C D and H i e hydrogen are in the order A C H B D A B A B C D H D H A C D B C A D B H C
Physical Chemistry
GeneralIn the intramolecular Cannizzaro s reaction when glyoxal is reacted with concentrated NaOH the n factor of glyoxal is 1 4 3 2 2 3 4 1
Physical Chemistry
Solutionsseparate 1 Chloroform and Aniline 2 Ether and Toluene 3 Hexane and Toluene
Physical Chemistry
GeneralWhen SO is passed through the solution of potassium iodate the oxidation state of lodine changes from 1 5 to 0 3 5 to 0 2 5 to 1 7 to 1
Physical Chemistry
Equilibrium144 At temperature T a compound AB g dissociates according to the reaction 2AB g 2AB g B g with a degree of dissociation x which is small compared to unity Deduce th expression for x in terms of the equilibrium constant Kp and the total pressure
Physical Chemistry
EquilibriumHydrolysis of sucrose is given by the following reaction Sucrose H 0Glucose Fructose If the equilibrium constant K is 2 10 at 300 K the value of AG at the same temperature will be 2 3 4 8 314 J mol K 1x300 Kx ln 2 1013 8 314 J mol K 300 K ln 2 101 8 314 J mol K 300 K In 3 101 8 314 J mol K 300 K ln 4 1013
Physical Chemistry
Generala IIT 2001 4 A graph is plotted between PV along Y axis and P along X axis where Vm is the molar volume of a real gas Find the intercept along Y axis IIT 2004
Physical Chemistry
Gaseous and liquid states5 A mixture of SO and O in the molar ratio 16 1 is diffused through a pin hole for successive effusions three times to give a molar ratio 1 1 of diffused mixture Which one are not correct if diffusion is made at same P and T in each operation I Eight operation are needed to get 1 1 molar ratio II Rate of diffusion for SO O after eight operations in and 0 707 III Six operations are needed to get 2 1 molar ratio for SO and O in diffusion mixture IV Rate of diffusion for SO and O after six operations is 2 41 1 I II III 3 I III 2 II III 4 IV
Physical Chemistry
GeneralOne or more than one correct option 11 The following is are endothermic reaction s a Combustion of methane b Decomposition of water c Dehydrogenation of ethane to ethylene d Conversion of graphite to diamond
Physical Chemistry
General578 The principle chromatography is 1 Adsorption 3 Solubility involved min in paper 2 Partition 4 Volatility
Physical Chemistry
GeneralHow many moles of KMnO are reduced by 1 mole of ferrous oxalate in acidic medium 76 How 1 1 2 5 3 HOS 1 3 3 4 3 GH
Physical Chemistry
General28 How much water is added to 100 ml 0 5M H SO4 solution so that its molarity becomes 0 1M 1 500 ml 2 400 ml 3 100 ml 4 200 ml
Physical Chemistry
Solid state28 O In an ionic solid 1 6 A and Use the radius ratio rule to determine the edge length of the cubic unit 0 cell is A A 4 B 2 3 C 3 3 D 4 3
Physical Chemistry
Surface chemistryLyophilic colloidal solution can be coagulated by 1 addition of high concentration of electrolyte 2 By addition of solvent like C H OH 3 By addition of excess H O 4 Both 1 2 correct
Physical Chemistry
General1 The density of helium is 0 1784 kg m at STP If a given mass of helium at STP is allowed to expand to 1 400 times of its initial volume by changing P and T compute its resultant density
Physical Chemistry
General28 What is the molarity and molality of a 13 solution by weight of sulphuric acid with a density of 1 02 g mL To what volume should 100 mL of this solution be diluted in order to prepare a 1 5 N solution le 1978 2M HO a 0 027 mmHg b 0 031 mmHg c 0 017 mmHg d nac 0001 bulib 3M
Physical Chemistry
SolutionsA 0 0020 m aqueous solution of an ionic compound Co NH3 5 NO CI freezes at 0 00732 C Number of moles of ions which 1mol of ionic compound produces on being dissolved in water will be K 1 86 C m 1 1 2 2 3 3 4 4
Physical Chemistry
General84 A drop 0 05 mL of 12 M HCI is spread over a thin sheet of aluminium foil thickness 1x10 cm and density 2 7 gmL Assuming whole of the HCI is used to dissolve Al The maximum area of hole produced in the foil is 1 2x10 cm 2 2 20 10 cm 3 200 10 cm 4 2000 10 cm
Physical Chemistry
Solutions1 00g of a non electrolyte solute molar mass 250g mol was dissolved in 51 2g of benzene If the freezing point depression constant K of benzene is 5 12 K kg mol 1 the freezing point of benzene will be lowered by 2 0 3 K 4 0 2 K 1 0 4 K 3 0 5 K
Physical Chemistry
Solutionsed K for benzene 5 12 kg mol K The molar volume of liquid benzene density 0 877 g ml increases by a factor of 2750 as it vaporizes at 20 C and that of liquid toluene density 0 867gml increases by a factor of 7720 at 20 C A Solution of benzene toluene has a vapour pressure of 46 0 torr Find the mole fraction of benzene in the vapour above the solution orallol glectrodes of cross section area 4cm
Physical Chemistry
Equilibrium2 55 N 10 acetic acid was titrated with B 0 05 56 When 20 ml of M 20 N 10 the pH of the solution will be K 10 A 5 log 1 3 5 5 log 3 C 5 log 1 3 5 5 log 3 C 0 05 NaOH When 25 50 and 75 of titration is over then 0 100 B 5 log 3 4 5 log 1 3 D 5 log 1 3 4 5 log 1 3 NaOH are added to 10 ml of D 2 5 M HC
Physical Chemistry
EnergeticsA rigid container contain 1 Kg m N gas at 400 K if final temprature is 800 K then find change in entropy kJ K Given C 29 099 joule to doidW P OHO HD di 1 512 86 joule pitan 2 1025 736 joule 3 256 43 joule 4 170 9 joule