Physical Chemistry Questions

48 Equal volumes of three acid solutions of pH 3 4 and 5 are mixed in a vessel What will be the H ion concentration in the mixture b 1 11 x 10 M d 3 7 x 10 M a 3 7 x 10 M c 1 11 x 104 M 2008

B Which of these molecules best relate to the MS spectrum with m z 89 NH2 NO2 a C 1 4 43 TOO 80 Relative abundance 50 30 20 46 M 89 1 10 15 20 25 30 35 40 45 50 55 60 1 90 70 65 75 BO 85 95 m

The number of sodium atoms in 2 moles of sodium ferrocyanide Na Fe CN is 1 12 x 23 2 26 x 1023 3 34 x 1023 4 48 x 1023 The total number of g molecules of SO Cl in 13 5 g of sulphuryl chloride is

Formation of a solution from two components can be considered as i Pure solvent separated solvent molecules AH ii Pure solute separated solute molecules AH iii Interaction between separated solvent and separated solute molecules in the solution AH3 Solution so formed will be ideal if 1 AHsolution AH AH AH3 2 AH solution AH AH AH3 3 AHsolution AH AH AH3 4 AHsolution AH3 AH AH

Arrange the following ions in increasing order of their ionic radii Ce La Pm3 and Yb 1 Ce Yb Pm La 2 Yb3 Pm Ce La 3 Yb Pm Lat Ce 3 4 Pm La Cet Yb Which factor affects the velocity constant k of a reaction 1 Change in the concentration of the reactant

A mixture of N and Ar gases in a cylinder contains 7 g of N and 8 g of Ar If the total pressure of the mixture of the gases in the cylinder is 27 bar the partial pressure of N is Use atomic masses in g mol N 14 Ar 40 a 9 bar b 12 bar c 15 bar d 18 bar NEET 2020

Given the following information for an ideal gas Isothermal reversible expansion P V T A T T B R P C V Which of the following is incorrect D Adiabatic reversible expansion T T Adiabatic irreversible expansion P V T P V T P2 V T

Which of the following pairs represents linkage isomers 1 Pd PPh NCS and Pd PPh SCN 2 CO NH NO So and CO NH SO NO 3 PICI NH Br and PtBr NH CI 4 Cu NH PICI and Pt NH CUCI

87 Consider the following reactions i NaNO HCI 0 5 C ii B naphthol NaOH 88 P The compound P is NH 2 Bry H O CH Colored Solid C H6NBr3 NH NH NHCH 2 CH 3 CH CH The function of Sodium pump is a biological process operating in each and every cell of al

3 Etard reaction 4 Williamson Synthesis 73 The anodic half cell of lead acid battery is recharged using electricity of 0 05 Faraday The amount of PbSO electrolyzed in g during the process is Molar mass of PbSO4 303 g mol 1 22 8 2 15 2 3 7 6 4 11 4

Consider the reaction below at equilibrium H O g C s CO g H g If the temperature is kept constant while the pressure is increased by compressing the mixture the equilibrium will If some carbon is removed the equilibrium will shift to the right shift to the left Oshift to the right remain unchanged Oshift to the right shift to the right O shift to the left shift to the left Oshift to the left remain unchanged

When a strong base was added to the solution of an unknown salt a gas with a characteristic smell was released that turned blue the red litmus paper and after that adding Silver Nitrate a white ppt was obtained then the formula of the salt should be

Write the reaction responsible for the solution being basic Do not include spectator ions If you chose multiple solutions in part 1 then write the reaction for the most basic solution X F H O He aq HF OH

8 10 moles of a liquid L are 50 converted into its vapour at its boiling point 273 C and at a pressure of 1 atm If the value of latent heat of vapourisation of liquid L is 273 L atm mole then which of the following statements is are correct Assume volume of liquid to be negligible and vapour of the liquid to behave ideally A Work done by the system in the above process is 224 L atm B The enthalpy change AH for the above process is 1365 L atm with respect to magnitude only The entropy of the system increases by 2 5 L atm in the above process D The value of AU for the above process is 1589 L atm

CHEMISTRY The molarity of HNO in a sample which has a density 1 4g mL and mass percentage of 63 is Molecular Weight of HNO3 63 4 28 M 1 7M 2 14 M 3 2 1 M The de Broglie wavelength of an electron in the 3rd Bohr orbit is

The osmotic pressure of 0 1 M monobasic acid of pH 3 at 27 C is 27 C 0 1 M pH 3 o 45 Jos Options 1 2 42 atm 2 42 242 4 atm 242 4 J 60 6 atm 60 6 50 9 atm 50 9

7 The equilibrium constant K for the following reaction is 1 47 x 10 H O FqHF9 H 0 F HF tequilibrium which of the following statements about the reaction is true A B C D The concentration of H 0 and F would be much larger than HF The concentration of HF would be much larger than H3O and F The concentration of H O F and HF would be approximately equal K has no effect on concentration

8 1 1 2 3 In the following reaction The structure of the major product X is 1 3 O N Cone HNO Conc H SO O N 3 0 5 2 X 4 2 NO NO

Under the right conditions ammonia can be converted to nitrogen monoxid NO by the following reaction NH3 O NO H O How many grams of H O could be formed from a mixture of 51 g of NH and 48 g of O

3 01 mol of an ideal gas in a 73 6 L container at 25C calculate each of the following quantities indicated in problem 8 11 9 The heat absorbed qrev for revisible isothermal expansion to a at constant initial temperature

lution contains 10 2 MCF 10 M Br and 0 01 CrO2 AgNO solution is slowly added to the ution of these ions Predict the color of the precipitate that first forms iven K AgC1 10 1 Ksp AgBr 10 12 K Ag CrO 10 14 sp sp Red B White C Yellow D Green

Two sample of HI each of 5 g were taken separately into vessels of volume 5 and 10 litr respectively at 27 C The extent of dissociation of HI will be 1 More in 5 litre vessel 2 More in 10 litre vessel 3 Equal in both vessel 4 None of these Ans 3 10

Nuclear magnetic resonance is a on the interaction between the Select with a magnetic field The population difference in a typical magnetic field of several Tesla at room temperature is on the order of Select and the lower the temperature the Select fact if we can cool the sample from 300 K to 0 3 K the population difference will be on the order of Select spectroscopic technique relying Select Several factors determine the resonant frequency of NMR spectroscopy The major contribution is Select 1 order of Select the signal In which is caused by the frequency shift is Select field but the relative shift on the order of Select of the nucleus The absolute is typically used in NMR spectroscopy A minor factor influencing the actual resonant frequency is Select which is on the Hz the magnetic

6 Anthony wants to know which of five acids is the strongest He refers to a table of Acid Dissociation Constants K After consulting the table below which acid did he decide was the strongest A B Name Arsenic acid Carbonic acid Oxalic acid Phosphoric acid Sulfurous acid Arsenic acid Carbonic acid Formula H ANO H CO H C O H PO4 H SO C Oxalic acid D Sulfurous acid Ka 5 0 103 4 3 10 6 5 x 10 7 5 10 3 1 5 x 10 2

For the reaction AB g A s 2AB g following graph is obtained InK L 1 T Which of the following will increase the concentration of AB g at equilibrium A Adding more of A s B Increasing temperature C Adding inert gas at constant pressure we of

the for G A b d The population difference ina typical magnetic field of several tesla arder off at room is on the for 2 a b temperature the parts per thousand million trillion billion 2 Hited proportional not related to inversaly proportioneel temperature and the lower the signal Maltaust

136 The pressure at the bottom of a tank of water is 3P where P is atmospheric pressure If the water is drawn out until the level of water is lowered by one fifth then the pressure at the bottom of the tank is 1 2P 2 3 8P 5 4 4P 5 13P 5 137 4 140 M M The d y 5 x tis in s 1 5000 2 2 m s 3 0 5 m 4 300

3 The chair form of cyclohexane has protons in two distinct environments axial and equatorial When the proton NMR of cyclohexane is run on a 100 MHz instrument at 23 C only one signal for the com A See Answer Stack of the engi AC 150 1600D 40 Co o to c C A450 CION AC100 10 0 D NC 1 0 50 0 0 0 2 0 ap IMCO tr CGCT H T79 4CC0 00 Which of the following is an oxidation reduction reaction A Cu s 2AgNO aq 2Ag s Cu NO3 2 aq B HCl aq NaOH aq H 0 NaCl ag C

Nuclear magnetic resonance is a spectroscopic technique relying on the interaction between the Select with a magnetic field The population difference in a typical magnetic field of coural Tacle at raam temperature is on the agnetic resonance is a spectroscopic technique relying eraction between the Select gnetic field Th Select field of several Select electron spin ture the Selec nuclear magnetic dipole e can cool the s electronic magnetic dipole on difference will be on the order or

49 How many gram of ice at 0 C can be melted by the addition of 500 J of heat The molar heat of fusion for ice is 6 02kJmol 1 0 083 g 2 1 580 g 3 3 06 g 4 12 0 g 50 A 1 0 g sample of substance A at 100 C is added to 100 mL of H O at 25 C Using separate 100 mL portions of H O dura in ranaated with abetanco R and then with cubetanca C How will the final

A 250 mm B 140 mm C 26 4 Given at 350 K PA 300 torr and PB 800 torr the composition of the mixture having a normal boiling point of 350 K is A XA 0 08 B XA 0 06 C XA 0 04 D XA 0 02 Two liquids A and B have P A and P B in the ratio of 1 3 and the ratio of number of moles of A and B in se in equilibrium with the solution is equal

0 In a solid AB having NaCl type structure A atoms occupy the corner of the cubic unit cell and the face centered positions If all the face centered atom along one of the axes are removed choose the correct options 3 Atomic weight of A 40 Atomic weight of B 60 r 1 4 r 2 8 A the packing fraction is 0 579 B The density of the resultant solid is 1 008 g cc C The packing faction is 0 679 D The density of the resultant solid is 2 008 g cc

Consider the following information at 25 C AgBr s c Ag Br nq E AgBr s Ag 0 07333V Ag aq Ag s Ag aq Ag s 0 8496 V What is the value of the solubility product equilibrium constant Kap AgBr of silver bromide in aqueous solution at 25 C S AgBr s Ag Br 1 Kp AgBr

Which is the most suitable reagent for the following transformation OH T CH CH CH CH CH CH CH CH CH CH CO H 1 alkaline kMnO 2 1 NaOH 3 Tollen s reagent 4 CrO CS

Alum is found to contain hydrated monovale cation M H O trivalent cation M H O Ja 3 SO2 in the ratio of 1 1 1 1 3 1 2 2 2 1 1 2 4 1 2 3

Two parallel planes 90 by 60m are separated by a distance of 60 cm One plane is maintained at a temperature of 800 K and has an emissivity of 0 6 The other plane is insulated The planes are placed in a large room that is maintained at 290 K Calculate the temperature of the insulated plane and the energy lost by the heated plane

3 8 Consider the following reaction A B C Experiment 1 2 3 Initial A 0 10 M 0 20 M 0 20 M Initial B 1 0 M 1 0 M 2 0 M The order of reaction with respect to A and B respectively are 2 2 0 0 2 3 2 1 12 2 4 Rate of Formation of C mis 2 1 10 3 8 4 10 3 8 4 10 3

Construct galvanic cells for the given spontanet reactions i Zn s 2HCl aq ZnCl aq H g 1 atm ii Cl g latm 21 aq I s 2Cl aq iii H g latm Cl g 1atm HCl aq 2 iv Fe aq Ce aq Fe aq Ce aq v H g latm AgCl s Ag s HCl aq

I In chromium chloride CrC13 CI ions have cubic close packed arragement and Cr ions are present in the octahedral holes The fraction of the total number of holes occupied is a 1 3 b 1 6 68100

Question 5 00 mL of 0 10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator The volume of NaOH required for the appearance of permanent faint pink color is tabulated below for five experiments What is the concentration in molarity of the NaOH solution Exp No Vol of NaOH mL 1 2 3 4 5 12 5 10 5 9 0 9 0 9 0

3 for the CO2 lon the two negative charges indicate that there are two additional electrons than those provided by the neutral atoms For NH on one positive charge indicates the loss of one electron 40 from the group of neutral atoms

DEVIATION OF REAL GASES FROM IDEAL GAS BEHAVIOUR At very low pressure and high temperature real gases behave as ideal gas De from ideal gas behaviour is mathematically denoted by Z named as compressibility factor low pressure Z V real V ideal VobsP nRT Pre Medical C P Vm obs RT

1 poin A car rounds a horizontal curve of constant radius at a constant speed Which diagram best represents the directions of both the car s velocity v and acceleration a Option 1 Option 3 V a a Option 2 Option 4 a a

At some temperature and under a pressure of 5 atm P C15 is 20 dissociated Calculate the pressure at which P C15 will be 30 dissociated temperature remaining the same A 1 685 atm B 0 192 atm

The following solution solvent has maximum vapour pressure a IM copper sulphate solution c 0 5M copper sulphate solution b page33 pure solvent water 2M copper sulphate solution d ure of solution containing dissolved no

W W ext For a system undergoing a particular process the work done is dv 2 This equation is applicable to a a System that satisfies the van der Waals equation of state b Process that is reversible and isothermal c Process that is reversible and adiabatic d Process that is irreversible and at constant pressure

As the temperature is raised from 20 C to 40 C the average kinetic energy of neon atoms changes by a factor of which of the following 1 1 2 2 2 3 Which one of the following aqueous solutions will exhibit highest elevation in boiling point 1 0 05 M glucose non ionisable 313 293 313 293

14 Consider the reaction A B at 1000 K At time the temperature of the system was increased to 2000 K and the system was allowed to reach equilibrium Throughout this experiment the partial pressure of A was maintained at 1 bar Given below is the plot of the partial pressure of B with time What is the ratio of the standard Gibbs energy of the reaction at 1000 K to that at 2000 K Partial Pressure of B bar 115 100 50 10 time

The free energy of formation of NO is 78 kJ mol at the temperature of an automobile engine 1000 K What is the equilibrium constant for this reaction at 1000K N 8 O g NO 8 Anti log 0 9263 8 459

Problem 42 Assuming a nitrogen molecule spherical in shape and occupying the radius 200 pm calculate a the volume of single molecule of gas b the percentage of empty space in one mole of N gas at NTP