Physical Chemistry Questions

5 A solution with osmotic pressure r is separated from another solution of osmotic pressure by SPM solvent flows from T then 1 1 1 3 Solutions are isotonic 2 4 Solutions are ideal

Which of the following pairs of physical quantities does not have same dimensional formula 1 Work and torque 2 Angular momentum and Planck s constant 4 Impulse and linear momentum 3 Tension and surface tension If the ratio of intensities maximum and minimum in Young s double slit experiment is 9 1 the ratio of amplitude of the coherent sources is 1 9 1 2 3 1 3 2 1 4 1 1 The angle of incidence at which reflected light is totally polarized for reflection from air to glas

The cell Pt H g 1atm H pH x Normal electrode has EMF of 0 64 volt at 25 C The standard reduction potential of normal electrode is 0 28 V The anodic compartment has PH Take 2 303RT F 0 06 at 298 K A 4 B 5 C6 he

The conductance of a 0 0015 M aqueous solution of a weak monobasic acid was etermined by using a conductivity cell consisting of platinized Pt electrodes The distance etween the electrodes is 120 cm with an area of cross section of 1 cm The conductance f this solution was found to be 5x10 S The pH of the solution is 4 The value of miting molar conductivity A of this weak monobasic acid in aqueous solution is Zx10 S cm mol The value of Z is

when 5 temperature of solution increases by t C Which of the following can be predicted from this observation A If 5 mL of 0 1M HCl is mixed with 5 mL 0 1 M NH3 solution the temperature rise will be less than t C B If 5 mL of 0 1 M CH3COOH is mixed with 5 mL 0 1 M NaOH the temperature rise will be less than t C C If 10 mL of 1 0 M HCI mixed with 10 mL of 0 1 M NaOH the temperature rise will be 2t C D If 10 mL of 0 1 M HCl is mixed with 10 mL of 0 1 M NaCl the temperature rise 11 L e

6 The number of atoms in 100 g of an fcc crystal with 3 and cell edge as 200 pm is equal density d 10 g cm CBSE PMT 1994 M fv to a 3 10 25 c 1 1025 422405231 b 0 5 x1025 inbroder d 2 x1025 lont solid the units which occupy latti

The osmotic pressure of 0 5 M aqueous solution of cane sugar at 300 K is R 0 0821 L atm K mol 0 123 atm 6 12 atm 1 23 atm hr m 12 3 atm

To 100ml of 0 1MCH COOH 0 2g of activated charcoal is added and shaken vigorously On settling down the conc of CH COOH is found out to be 0 05M Then the mass of CH COOH adsorbed per gram of activated charcoal is A 0 3 g B 1 5 g C 0 6 g D 1 8 g

9 A mixture of toluene and benzene boils at 100 C Assuming ideal behaviour the mole fraction of toluene in the mixture is closest to Vapour pressures of pure toluene and pure benzene at 100 C are 0 742 and 1 800 bar respectively 1 atm 1 013 bar a 0 824 c 0 544 b 0 744 d 0 624

1 Rate k A B 2 Rate k A B 3 Rate k A B 4 Rate k A B 0 For a reaction scheme A k Bk C if the rate of formation of B is set to be zero then 1 the concentration of B is given by k 1 A 2 k k A 3 k k A 4 k k A 1 The given plots represent the variation of the concentration of a reactant R with time for two different reactions i and ii The respective 2 4 3 8 4 1 THE Cons of ar diffe The depe volu

M molecular weight of NH OH Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcium bicarbonate and 74 5 ppm of potassium chloride is 1 8 2 4 3 3 4 2 om on acidified Kl solution The strength of H O solution 2

Which of the following is correct A Mole fraction of I mole fraction of II 1 If only two components are present Mole fraction of I Mole of I B Mole fraction of II Mole of II If only two components are present C Mole fraction of solute Moles of solute Moles of solute Moles of solvent D All of the above

1 mole of monoatomic ideal gas undergoes a reversible cyclic process Given log2 0 3 R 2 cal mol K A P atm 5 1 10 8 21 16 42 V L Select correct option s B C C A NG for process AB 4 606 kcal B 82 1 2SBC SCA 0 6cal K SH C 4 5kcal

Which of the following is an example of positively charged colloidal solution M 1 100ml AgNO3 100ml KI 10 M 10 M 20 M 2 100ml 10 AgNO3 100ml KI M M 3 100ml AgNO3 100ml KI 20 10 4 100ml AgNO3 100ml M KI

A binary liquid solution is prepared by mixing n heptane and ethanol Which one of the following statements is correct regarding the behaviour of the solution Option A The solution formed is an ideal solution B The solution is non ideal showing possible deviation from Raoult s law C The solution is non ideal showing negative deviation from Raoult s law Rate this quest

Two litre solution of a buffer mixture containing 1 0 M NaH PO and 1 0 M Na HPO4 is placed in two compartments one litre in each of an electrolytic cell The platinum electrodes are inserted in each compartment and 1 25 A current is passed for 965 min Assuming electrolysis of only water at each compartment what will be pH in each compartment after passage of above charge pK for H PO4 2 15 log 7 0 85 a Anode 3 00 Anode 1 30 b Cathode 3 00 d Cathode 1 30

8 The reaction of H3N3B Cl3 A with LiBH in tetrahydrofuran gives inorganic benzene B Further the reaction of A with C leads to H3N3B3 Me 3 Compounds B and C respectively are 1 Borazine and Me Br 3 Diborane and MeMgBr 2 Boron nitride and MeBr 4 Borazine and MeMgBr

An aqueous solution contains an unknown concentration of Ba2 When 50 mL of a 1 M solution of Na2SO4 is added BaSO4 just begins to precipitate and the final volume of solution is 500 mL The solubility product of BaSO4 is 1 x 10 10 What is original concentration of Ba 5 x 10 M 2 10 M 1 1 10 M 1 0 10 10 M

69 In HS I R NH2 NH3 order of proton accepting tendency will be a I NH3 R NH HS b NH3 R NH HS c R NH NH3 HS d HS R NH NH3 F means Myhre basicit 2001

How many statements are is belongs to gemma cup a Unicellular structure b Green in colour c Multicellular bud d Participate in sexual reproduction Question Type Single Correct Type 1 2 21

with a magnetic field The population difference in a typical magnetic field of several Tesla at room temperature is on the order of Select Nuclear magnetic resonance is a spectroscopic techni Select t parts per thousand parts per million parts per trillion parts per billion population um and the lower the Select 1 lifference in a t temperature is and the low the s OK to 0 3 K th ence will be on the order of

Degree of dissociation of three binary electrolytes AB CD and EF are 60 20 and 100 in the solution having same mole fraction of water Ratio of lowering in vapour pressure of their solution is 1 0 8 0 6 1 3 0 3 0 5 0 2 2 0 2 0 4 0 1 4 1 2 0 5

For the reaction mechanism A M KAM K 1 AM A k A M A Derive the rate law of the reaction using steady state approximation B Derive the rate law using pre equilibrium approximation C Under what conditions would the two methods have the

When the pure solvent diffuses out of the solution through the semi permeable membrane then the process is called A Osmosis B 00 C Reverse osmosis Sorption Dialysis

For the equilibrium LiCl 3NH3 s LiCl NH 3 s 2NH3 g 2 K 9 atm at 37 C A 5 litre vessel contains 0 1 mole of LiCl NH 3 How many moles of N should be added to the flask at this temperature to derive the backward reaction completion Use R 0 082 atm L mol K a 0 2 b 0 59 c 0 69 d 0 79

130 A compound A when reacted with PCI and then with ammonia gave B B when treated with bromine and caustic potash produced C C on treatement with NaNO and HCl at 0 C and then boiling produced orthocresol Compound A is o toluic acid o chlorotoluene 3 0 bromotoluene 4 m toluic acid 1 2

9 For following reactions A 700 K 500 X Product Product A Is was found that the E is decreased by 30 kJ mol in the presence of catalyst If the rate remains un the activation energy for catalysed reaction is Assume per exponential factor is same 1 75 kJ mol 2 105 kJ mol 3 135 kJ mol 4 198 kJ mol The maior product 7 obtained in the following reaction scheme is

If 1 mole of a non ideal gas initially at 325 K and occupying 5 0 L is allowed to expand isobarically to twice the original volume what is the work done by the gas Note 1 355 L atm mol a b 3 201 x 10 2 L mol R 0 0821 1 L atm Lxatm molex K 101 325 J Provide your answer in kilojoules using only numbers Ignore the sign on the value

If 270 0g of water is electrolysed during an experiment with 75 current efficiency then 168L of O2 g will be evolved at anode at 1 atm and 273 K total 504L gases will be produced at 1 atm and 273 K 336L of H2 g will be evolved at cathode at 1 atm and 273 K 45 F electricity will be consumed

What formulas do I use for this problem and what do the formulas mean and how to solve this problem step by step I am confused In the laboratory 31 0 g of ice at 0 degrees celsius is placed into an 85 0 g copper calorimeter cup that contains 155 g of water at an initial temperature of 23 0 degrees celsius After the ice melts the final temperature of the water is found to be 6 25 degrees celsius From this laboratory data find the heat of fusion of water and the percentage error between the standard value and this experimental value

1 Mn O 14 2 MhO 3 MnO 4 An aqueous solution of 6 3 g of oxalic acid dihydrate is made upto 250 ml The volume of 0 1 N NaOH required completely neutralise 10 mL of this solution is 1 40 ml 2 20 mL HO 18 3 10 mL 4 4 mL water oxygen radioactivity will be shown by which of the product

The compounds commonly known as amino acids are actually a aminocarboxylic acids What carbonyl compound should be used to synthesize the amino acid shown here Hint think reductive amination and keep same formal charge Part A CH3CH NH

The Lewis symbol for an atom consists of an elemental symbol surrounded by a one dot for each of its valence electrons b one dot for each of its valence shells c one dot for each of the electronic sublevels d one dot for each of the principle quantum levels

Molar conductivity of a weak electrolyte AB at 0 01 M concentration was found to be 10 S cm mol 1 What will be the molar conductivity of this electrolyte when concentration is 0 005 M The molar conductivity at infinite dilution is 400 S cm mor Assume the degree of dissociation is negligible as compared to unity 14 14 S cm mol 1 A B 28 28 S cm2 mol 1 C 40 S cm mol 1 D 100 S cm mol 1

The figure that is not a direct manifestation of the quantum nature of atoms is Rb 1 1 Internal 1 energy of Ar 3 1 300 400 500 600 Increasing wavelength 2 Kinetic energy of photoelectrons Intensity of 4 black body radiation K Na Frequency of incident T T T

1 At low temperatures the rate law for the reaction CO g NO2 g CO2 g NO g is Rate K CO NO2 Don t ask my bad NO Work out the rate law for each of the following mechanisms show all your work and then circle the one that is consistent with the rate law determined above Circle i ii iii i CO NO2 CO2 NO slow ii NO2 NO O equil O CO CO2 slow iii 2 NO2 2 NO O2 equil CO 02 CO2 O slow O NO NO2 fast

If x molar 400 ml oxalic acid solution completely oxidised with 160 ml 0 05 molar acidified KMnO4 solution Then what will be the pH of initial oxalic acid solution if it dissociate completely

Que 4 From the following thermochemical equations find out dissociation energy of CH3 H bond CH31 g CH3 g I g CH4 g 12 s CH31 g HI g HI g H g I g 12 s 21 g 108 8 kcal mol 213 8 kcal mol 133 8 kcal mol AH 54 0 kcal AH 29 0 kcal AH 79 8 kcal AH 51 0 kcal

Consider the following equilibrium in a closed container N O4 g 2NO g At a fixed temperature the volume of the reaction container is halved For this change which of the following statements holds true regarding the equilibrium constant K and the degree of dissociation a a Neither K nor a changes P b Both K and a change P c K does not change but a changes P d K changes but a does not change

5 The total pressure of a mixture of hydrogen helium and argon is 99 3 kPa If the partial pressure of helium is 42 7 kPa and the partial pressure of argon is 54 7 kPa what is the partial pressure of hydrogen

Q 28 A sample of Nitrogen gas was 1 placed in a flexible 9 litre container at 300k at a pressure of 1 5 atm The gas was compressed to a volume of 3 0L and heat was added until the temperature reached 600k What is the new pressure inside the container

The rate constant of a first order reaction is 15 10 b 7 57 s a 34 07 s d 15 s to 3 0 g c 10 10 s Half life period of a first order reaction is 10 min What percentage of the reaction will be completed in 100 min a 25 b 50 c 99 9 d 75 tatements is incorrect

2 Assume that the cooking of an egg is a first order process Assume further that it takes 3 minutes to half cook soft boil an egg at 100 C If the activation energy of the cooking of an egg is 75 kJ mole how long would it take to soft boil an egg at the top of Mt Everest where water boils at 80 C

In acid rain in Delhi it was found that 1 L rain water consist of 2 463 L equimolar mixture of SO3 NO2 gas dissolved at a partial pressure of 0 1 atm Find out the pH of the solution if HNO2 prod is 60 dissociated under given condition at 27 C R 0 0821 L atm mol K log 1 8 0 Rate this qu Your Answer Unattempted Correct Answer

2 5 When 0 1 mol MnO4 is oxidised the quantity of electricity required to completely oxidise MnO to MnO4 is a 96500 C c 9650 C AIPMT 2014 b 2x96500 C d 96 50 C for fat wt 108 displaced b 1

When air expands adiabatically without gaining or losing heat its pressure P and volume V are related by the equation PV1 4 C where C is a constant Suppose that at a certain instant the volume is 420 cubic centimeters and the pressure is 77 kPa and is decreasing at a rate of 13 kPa minute At what rate in cubic centimeters per minute is the volume increasing at this instant cm min Pa stands for Pascal it is equivalent to one Newton meter squared kPa is a kiloPascal or 1000 Pascals

4 34 5 1 g NH4 SH is introduced in 3 0 L evacuated flask at 327 C 30 of the solid NH SH decomposed to NH3 and H S as gases The K of the reaction at 327 C is R 0 082 atm mol K molar mass of S 32 g mol molar mass of N 14 g mol

89 A weak acid HX has the dissociation constant 1 x 10 M It forms a salt NaX on reaction with alkali The degree of hydrolysis of 0 1 M solution of NaX is 2 0 15 1 0 0001 3 0 01 configuration 90 When the following aldohexose exists in its D stereoisomers in its pyranose form is 1 2 2 4 3 6 4 0 1 the total number of 4 8

How many moles of iron metal will be produced by passage of 4A of current through 1L 0 1 M Fe solution for 1 hour Assume only iron Fe 3 3e Fe is reduced B 0 2459 D 0 0521 A 0 0156 C 0 0245

A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure V K N L M P The succeeding operation that enable this transformation of state are