Physical Chemistry Questions

When 1 L of NaOH 1M is mixed with 1 L of HCI 1 M the temperature of reaction mixture rises by 10 C When 1 L of NaOH 1 M is mixed with 2 L 0 5 M HCI the temperature of reaction mixture rises approximately by 1 10 C 2 5 C 3 6 67 C 4 3 33 C

8 500 mL of a solution contain 1 10th of equivalen mass of HCI The normality of solution will be a et b 0 3 c 0 2 d 0 4

3g of activated charcoal was added to 50 mL of acetic acid solution 0 06N in a flask After an hour it was filtered and the strength of the filtrate was found to be 0 042 N The amount of acetic acid adsorbed per gram of charcoal is JEE Main 2015 1 42 mg 4 36 mg 3 18 mg 2 54 mg

The coagulation of 100 mL of a colloidal sol of gold is completely prevented by addition of 0 03 g of Haemoglobin to it before adding 1 mL of 10 NaCl solution Calculate the gold number of Haemoglobin

Calculate pH of following solutions ay 0 1 M HCI b c d e f g h i 1 0 1 M CH COOH K 1 8 x 10 5 log 1 8 0 13 0 1 M NH OH K 1 8 10 5 10 8 M HCI 401 20 02 log 1 051 0 03 10 10 M NaOH 10 6 M CH3COOH K 1 8 10 5 10 8 M CH COOH K 1 8 x 10 5 401 20 02 log 1 051 0 03 Decimolar solution of Baryta Ba OH diluted 100 times 10 3 mole of KOH dissolved in 100 L of water Equal volume of HCl solution PH 4 0 0019 N HCl solution

C 4 9 10 9 D 4 9 10 7 At 30 C In which of the one litre solution the solubility of Ag CO3 solubility product 8x 10 2 be maximum C 0 05 M AgNO D 0 05 M NH 4 10 5 A 0 05 M Na CO B Pure water Read the following i An equimolar coluti

A bcc lattice is made up of hollow spheres of B Spheres of solids A are present in hollow spheres of B The radius of A is half of the radius of B The ratio of total volume of spheres of B unoccupied by A in a unit cell and volume of unit cell is Ax T 3 64 Find the value of A

1 In a hydrogen atom if energy of an electron in ground state is 13 6 eV then that in the 2nd excited state is AIEEE 2002 a 1 51 eV c 6 04 eV b 3 4 eV d 13 6 eV

The boiling point of 0 2 mol kg solution of X in water is greater than equimolal solution of Y in water Which one of the following statement is true in this case A B C D Molecular mass of X is less than the molecular mass of Y Y is undergoing while X undergoes no change X is undergoing dissociation in water dissociation in water while y undergoing no change Molecular mass of X is greater than the molecular mass of Y

d Iragmentation 65 The method usually employed for the destruction of a colloidal solution is a dialysis b addition of electrolytes c diffusion through animal membrane d condensation

7 What volume of gaseous NH at 0 C and 1 atm will be required to be passed into 30 ml of N H SO4 solution to bring down the acid strength of this solution to 0 2 N a 537 6 ml c 1075 2 ml b 268 8 ml d 371 3 ml

5 C d e f h 1 1 0 1 M HCI 0 1 M CH COOH K 1 8 10 5 log 1 8 0 13 0 1 M NH OH K 1 8 10 5 10 8 M HCI 401 20 02 log 1 051 0 03 10 10 M NaOH 10 6 M CH COOH K 1 8 10 5s 10 8 M CH COOH K 1 8 x 10 5 401 20 02 log 1 051 0 03 Decimolar solution of Baryta Ba OH diluted 100 times 10 3 mole of KOH dissolved in 100 L of water Equal volume of HCl solution PH 4 0 0019 N HCl solution

During the electrolysis of molten sodium chloride the time required to produce 0 10 mol of chlorine gas using a current of 3 A is 1 220 minutes 3 55 minutes 2 330 minutes 4 110 minutes

Assuming a black body at a temperature of T and that the Earth is also a black body Diameter of Sun subtends a very small angle 0 radians at the centre of Earth Neglect sources of heat from the Earth itself If an opaque cloud of dust particles in the form of a spherical shell with a radius equal to half the radius of the Earth s orbit were interposed between Earth and Sun centred on the Sun Mark the CORRECT statement s Assume cloud of dust and earth to behave as black body A Equilibrium temperature of cloud T is T e B Equilibrium temperature of cloud T is Ts C Equilibrium temperature of Earth T is 2 TD D Equilibrium temperature of Earth T is 4 Colo 0 AC

m The correct expression x 1 aP a c m x m b 1 aP 1 bP for Langmuir adsorption isotherm is x b d m X aP 1 bP 1 bP m a YE EI ap Top T op ab a n btained according to Langmuir

5 14 Calculate H CH COO and C H O in a solution that is 0 02 M in acetic acid and 0 0 in benzoic acid K acetic 1 8 x 10 5 K benzoic 6 4 10 5 a POLYPROTIC ACIDS RACES

3 AsF5 trigonal bipyramidal 4 H O bent 109 Which of the following conversions involves change in both shape and hybridisation 1 BF3 BF4 2 H O H O 3 CH4 C H6 JEE MAINS Onlin 4 NH NH

5 The molality of 1M solution of NaCl specific gravity 1 0585 g mL is a 1 0585 b 1 0 c 0 10 d 0 0585

2 In the reaction N O 2NO at equilibrium the concentrations of N O and NO are 0 25 0 05 and 1 M respectively Calculate initial concentrations of N and O 2 1 0 25 M 0 35 M 2 0 05 M 0 35 M 3 0 75 M 0 55 M 4 0 75 M 0 45 M

23 Which of the following a AgCl b KC1 is least ionic c BaCl d CaCl

5 What systems did the EEIC put in place to ensure indigo cultivation in India

Gold number is a measure of a protective action by a lyophilic colloid on a lyophobic colloid bug c b protective action by a lyophobic colloid on a lyophillic colloid WITCHIN c number of mg of gold in red gold solblog lebi d stability of gold sol iste gi de grivollot od to doidW ixtl 5 a b c c 90 T

2 25 One mole of X is mixed with one mole of Y in a flask of volume 1 litre If at equilibrium 0 5 mole of Y are obtained Then find out K for reaction 2 P LICAT X Y 2XY 2 g 1 12 2 9 g 3 4 4 36

00 Which of the following methods is used for the destruction of sol a Condensation to sigrasxo Dialysis 1725 458 c Diffusion through animal membrane a pag 3 d Addition of an electrolyte aib belus

Q Assuming the force constant to be the same for H O and D O A normal mode for H O is at 3650cm Do you expect the corresponding D O wave number to be higher or lower Q Calculate the vibrational frequency of CO given the following data mass of C 12 01 amu mass of O 16 amu the force constant k 1 86 10 kg s

NaCl is doped with 10 4 mol SrCl the o concentration of cation vacancies is Hint Concentration of vacancies 1 6 02 x 10 5 mol 1 3 6 02 x 10 7 mol 10 4 100 N A 2 6 02 x 10 6 mol 4 6 02 x 10 4 mol

Dinitrogen oxide Nitrogen I oxidel Nitrogen monoxide Nitrogen II oxide Dinitrogen trioxide Nitrogen III oxide Nitrogen dioxide Nitrogen IV oxide Dinitrogen tetroxide Nitrogen IV oxide N O NO N O3 NO N O4 Dinitrogen pentoxide N 0 Nitrogen V oxide nitrogen 1 2 3 4 4 5 prepara NH NO3 N O 2H O 2NaNO 2FeSO4 3H SO4 colourless gas neutral Fe SO4 2NaHSO 2H O 2NO 2NO N O4 2Pb NO3 2NO 250K Cool Heat 673K 4NO 2PbO 0 2N O3 N O4 4HNO3 P4010 colourless gas neutral 4HPO3 2N O5 blue solid acidic brown gas acidic colourless solid liquid acidic colourless solid acidic

solubility product of Ca OH is 10 11 the pH which Ca OH precipitate from a solutio containing decimolar concentration of Ca is 1 5 3 9 2 9 pH 5 4 9 pH 7

The molecules that will have dipole moment are A 2 2 dimethylpropane C cis hex 3 ene 1 B trans pent 2 ene D 2 2 3 3 tetramethylbuta

2 At 490 C the equilibrium constant for the synthesis of HI is 50 The value of K for the dissociation of HI will be A 20 0 B 2 0 C 0 2 D 0 02

At the equilibrium of the reaction N O g 2NO g the observed molar mass of N O4 is 77 70 g The percentage dissociation of N O is 1 28 4 2 46 7 3 22 4 4 18 4

PCI PCI Cl is 0 5 at 500 K What is the state of vessel shown below 8 PCI X f Zh Lo p PCI fo C 8 1 The contents of the vessel are not in equilibrium with an excess of PC15 2 The contents of vessel are in equilibrium 3 The contents of the vessel are not in equilibrium with an excess of PCI and Cl 4 Nothing can be predicted regarding the o equilibrium just from the diagram given above ad llw onny noi

of the reaction Ecell MnO4 Fe H Mn 2 Fe3 H O is 0 59 2 at 25 C The equilibrium constant for the reaction 1 50 3 1050 2 10 4 105

6 2NH HSO4 H NH4 S O8 Electrolysis NH4 S O 2H O2NH HSO4 H O steam distillation What amount of current have to be used in first reaction to produce enough intermediate to yield 102 g pure H O per assume current efficiency is 50 2 A 9650 C C 4 10 C B 245000 C D 1158000 C 115

At 48 C the vapour pressure of pure CS is 850 torr A solution of 2 0 g of sulphur in 100 g of CS has a vapour pressure 844 9 torr Determine the atomicity of sulphur molecule

D For given hypothetical elementary parallel reaction A k 2B Where k 1 k 2 k2 k 2C Initially only 2 moles of A are present The total number of moles of A B and C at the end of 75 reaction are Multiply your answer with 102

76 Which one of the following emulsifying agents helps in the formation of w o emulsion a Proteins c Insoluble soaps 201 M b Gums d Soluble soaps electrolyte which is able

Calculate E and E for the cell Sn Sn 1M Pb 10 M LPb EO Sn Sn E Pb2 Pb 0 13V Is cell representation correct

0 45 On addition of NaOH to CH3COOH solution 60 of the acid is neutralised If pK of CH COOH is 4 7 then the pH of the resulting solution is A More than 4 7 but less than 5 0 C More than 5 0 ill B Less than 4 7 but more than 4 0 D Remains unchanged able acidic when

1 Two point charges A and B having charges l and Qrespectively are placed at certain distance apart and force acting between them is F If 25 charge of A is transferred to B then force between the charges becomes a F 16 F b 9 F 16 4 F

The correct order of increasing bond angles in the AIPMT Prelims 2010 following species are 1 CI O CIO CIO 2 2 CIO CI O CIO 2 3 CI O CIO CIO 4 CIQ CI O CIO

22 In two vessels each containing 500ml water 0 5 millimol of aniline K 10 2 and 25 m mol of HCl are added separately Two hydrogen electrodes are constructed using these solutions Calculate the emfo cell made by connecting them appropriately log5 0 7 Given 2 303RT F 0 06

At 298 K the standard free energy of formation of H O is 256 5 kJ mol while that of its ionisation to H OH is 80 kJ mol What will be reversible emt at 298 K of the cell H g 1 bar H IM OH 1M O g 1 bar Fill your answer by multiplying it with 10

The vapour pressure of a solvent decreases by 10 mm of Hg when a non volatile solute was added to the solvent The mole fraction of the solute in the solution is 0 2 What should be the mole fraction of the solvent if the decrease in vapour pressure is to be 20 mm of Hg 1 0 2 2 0 4 luni 4 0 8 3 0 6 sealurit

1 2 g sample of Na CO3 and K CO3 was dissolved in water to form 100 ml of a solution 20 ml of this solution required 40 ml of 0 1 N HCI for complete neutralization Calculate the weight of Na CO3 in mixture If another 20 ml of this solution is treated with excess of BaCl2 what will be the weight of precipitate

13 The half life of a substance in a certain enzyme catalysed reaction is 138 s The time required for the concentration of the substance to fall from 1 28 mg L to 0 04 mg Lis a 414 s b 552 s c 690 s d 276 s Mains 2011

How many grams of urea on heating yield 1022 molecules of biuret by the reaction 2 CO NH H N CO NH CO NH NH B 0 995 A 1 495 C 1 99 D 1 753

4 Bond length is unpredictable 3 Bond length in NO is greater than NO The states of hybridization of boron and oxygen atoms in boric acid H BO3 are respectively 4 sp and sp 1 sp and sp A 2 sp and sp3 3 sp and sp Which one of the following has the regular tetrahedral structure 11 VDr AIE TAIF

The concentration of hydrogen ion in a sample of soft drink is 3 8 x 10 M what is its pH Solution pH log 3 8 x 10 1 log 3 8 log 10 0 58 3 0 2 42 2 42 Therefore the pH of the soft drink is 2 43 and it can be inferred that it is acidic

53 The equilibrium constant K for the reaction 2HI g H g 1 g at room temperature is 2 85 and that at 698 K is 1 4 x 102 This implies that A HI is an exothermic compound B HI is very stable at room temperature C HI is relatively less stable than H and I D HI is resonance stabilized 60