Physical Chemistry Questions

5 Vapour pressure of chloroform and dichloromethane at 298K are 200 mm Hg and 415mm Hg resp i Calculate the vapour pressure of solution prepared by mixing 25 5g of CHCI3 and 40g of CH2C12 at 290K ii Calculate the mole fraction of each mponent

1 2 3 75 Identify the product in the following reaction 3 4 5 Tribromoaniline 1 3 4 5 Tribromo nitroaniline 3 3 4 5 Tribromophenol 4 All of these 2 1 2 3 Tribromobenzene 4 2 4 6 Tribromobenzene

extent Find out the final volume of reaction mixture Suppose F I remains constant throughout the course of reaction Problem 6 Calculate the mass in g of a 2 g atom of Mg b 3 N atoms of Mg

O 50 The standard reduction potential at 25 C for the reaction 2H O 2e H 20H is 0 8277 volt The equilibrium constant for the reaction 2H O 1 10 12 H O OH at 25 C is 2 10 14 3 10 11 4 10 8

a A phototube in a photoelectric device has a photosensitive element When light of wavelength 574 6 nm is shone on this surface electrons are emitted with a maximum kinetic energy of 1 958 x 10 19 J electron What wavelength of light would emit electrons with a maximum kinetic energy of 2 345 x 10 19

Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0 25 mole litre of ammonium chloride and 0 05 mole litre of ammonium hydroxide Calculate the concentration of aluminium and magnesium ions in the solution K NH OH 1 8 x 10 5 K Mg OH 6 x 10 10 Ksp Al OH 6 x 10 32

According to law of photochemical equivalence the energy absorbed in ergs mole is given as h 6 62 x 10 27 ergs c 3 x 10 0 cm s NA 6 02 x 1023 mol 1 196 108 a 2 2 859 10 6 c b d 2 859 105 1 196x10 6

An antibiotic form of Penicillin is found to show weak monoprotic acid behaviour as HP H P K 1 64 10 13 where HP is parent acid and Pis conjugate base A pH range of 4 5 to 5 0 at 25 C is necessary for growth of penicillin containing moulds Which of the following is correct about the solution formed when a tablet containing 0 12 M sodium salt of penicillin NaP is dissolved in a glass of water

46 For an electrolyte solution of 0 05 mol L 1 the conductivity has been found to be 0 0110 S cm The molar conductivity is 1 0 055 S cm mol 1 3 0 22 S cm mol 2 550 S cm mol 1 4 220 S cm mol

21 In the closest packing of atoms select incorrect statement 1 Coordination number of particles placed in of tetrahedral voids is smaller than octahedral voids 2 Size of tetrahedral void is larger than that of octahedral void 3 Size of voids depend upon size of atoms and tetrahedral void is smaller than octahedral void 4 Radius ratio for tetrahedral voids is smaller than octahedral void bhours of Na in NaCl crystal

Which one of the following aqueous solutions when mixed with an equal volume 0 10 mol L 1 aqueous NH3 will produce a buffer solution A 0 050 mol L 1 NaOH B 0 10 mol L 1 CH3COOH C 0 10 mol L 1 HCI D 0 20 mol L 1 HCI E 0 20 mol L 1 NH4Cl

3L of a mixture of O and O having pressure of 8 21 atm at 27 C is treated with 800 ml of 2 M KI solution buffered with a borate buffer of pH 9 2 the iodine so liberated is titrated with 200 ml of 2M hypo solution The mole of ozone in the mixture Assume ideal behaviour of gaseous mixture Given R 0 0821 L atm mol K A 40 D 10 B 30 C 20

1 NaOH 58 The strength in volumes STP 22 4 litre 1 10 volume 100 2 KOH 3 RbOH 4 LiOH of a solution containing 30 36 g L of H O is Given volume of 1 mole of gas 2 20 volume 3 5 volume 4 None of these

10 Two electrolytic cells containing AgNO3 abd CuSO4 solution connected in series A steady current of 2 5A was passed till 1 078g of Ag is deposited How long did the current flow What mass of copper will be deposited atomic mass of Ag 107 8 Cu 63 5

a 2 mole of CO b 2 N molecules of CO Problem 10 How many molecules are in 5 23 g of glucose C6H1206 Problem 11 How many carbon atoms are present in 0 35 mole of C6H12 Problem 12 How many nitrogen atoms are in 0 25 mole of Ca NO3 2 Problem 13 How many molecules of water are present in the one ml of

Using this diagram of carbon dioxide determine how many valence electrons each oxygen atom has after bonding with the carbon atom 000 A 8 B6 C4 D2 This metal and nonmetal have formed an ionic bond What is the name of the compound that has been formed A sodium chlorine B sodium chloride Na CI Ci C sodiumide chloride D sodiumide chloride The diagram below shows that aluminum has bonded to chlorine The proper term for this diagram is a A chemical formula B compound formula C mass formula D reaction formula AICI The name of the compound shown in the chemical formula below is AICI A aluminum chlorine B chlorine aluminide Caluminum chloride D chloroaluminum o 4 6 8 10 In the diagram below one sodium atom has bonded to one chlorine atom What type of bond has formed between these two atoms Na CI A metallic B covalent Conic D molecular When a group of active metal atoms are put together a strong force of attraction called a n develops between these atoms A lonic bond B covalent bond C metallic bond D magnetic bond A30D How many atoms make up the compound shown below AICI What is the correct formula for two molecules of sodium bromide A NaBrx2 B 2NaBr C NaBr2 D 2xNaBr

of MgCl is 240 S cm mol 1 A of Mg2 is 100 S cm mol 1 All above measurements are done in an conductivity cell Assuming MgCl to be a strong electrolyte which of the following is incorrect Question Type Multiple Correct Type 1 Limiting equivalent conductivity of MgCl2 is 480 S cm eq 2 of MgCl varies linearly with its concentration 3 of 0 04 M MgCl will be 160 S cm mol 1 4 of 0 04 M MgCl will be 200 S cm mol 1

At 27 C temperature following experimental observations are obtained for the reaction 2A B 3C Exp No 1 2 3 1 A 2 0 01 M 0 02 M 0 02 M The value of rate constant for reaction is 3 6 93 x 10 5 1 B Question Type Single Correct Type 6 93 x 10 4 1 0 01 M 0 01 M 0 02 M 3 46 x 10 45 1 Rate M sec 1 6 93 x 10 6 1 386 x 10 5 1 386 x 10 5

The volume of gases NH3 CO2 and H adsorbed by one gram of charcoal at 300 K are in order of Question Type Single Correct Type 1 H2 CO2 NH3 2 NH3 H2 CO2 3 NH3 CO2 H2 4 CO2 NH3 H2

1 2 3 6 2 6 3 2 Choose the incorrect match 1 K PtCh C H4 Zeise s salt 2 Fe CO s Trigonal bipyramidal 3 CO NH3 Inner orbital complex 4 Cr NH3 Diamagnetic 3 1 2 3 4 3 6 2

If an electric current of 1 50 amps is passed through the cell used in question 17 for 40 0 minutes what would be the mass in grams of Cu s that is deposited on the electrode A 1 19 grams of Copper B 2 38 grams of Copper C 3 60 grams of Copper D 1 87 grams of Copper

A Solution of weak acid HA was titrated with base NaOH The equivalent point was reached when 40ml of 0 1M NaOH has been added Now 20ml of 0 1M HCI were added to titrated Solution The pH was found to be 5 What will be the pH of the Solution obtained by mixing 20ml of 0 2M NaOH and 20ml 0 2M HA A 7 B 4 C 9

Three reactions involving H PO4 are given below 1 H3PO4 H O H O H PO4 2 ii H PO4 H O H30 HPO4 2 iii H PO4 HO O H PO4 In which of the above does H PO act 4 as an acid A i only B ii only C i and ii D iii only

At high pressure the molecular distance between gas particles appl 5 Which of the following pairings is incorrect in describing the spin states of d electrons in complexes Tetrahedral low spin Square planar low spin Octahedral Strong field ligand low spin Octahedral Weak field ligand high spin

The pk value of ammonium hydroxide is 4 75 An aqueous solution of ammonium hydroxide is titrated with HCI The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be A 9 25 B 8 25 C 7 50 D 4 75

In an acid base titration 0 1 M HCI solution was added to the NaOH solution of unknown strength Which of the following correctly shows the change of pH of the titration mixture in this experiment 1 3 pH PH A 1 B V mL 2 V mL 2 4 pH Is V mL pH V ml

Will Fe OH 3 s precipitate from a buffer solution prepared by mixing 0 5M CH COOH and 0 15M CH COONa at 25 C if the solution contains 0 25M Fe Ksp Fe OH 3 4 x 10 38 K CH COOH 1 74 x 10 5

86 What is the electrode potential of a gaseous hydrogen electrode dipped in a solution pH 5 0 relative to the calomel electrode with an electrode potential of 0 28 V 1 0 015 V 2 0 575 V 3 0 015 V 4 0 575 V

3 5 1 4 9 2 2 3 3 16 81 4 3 2 The maximum number of carbon atoms arranged linearly in the molecule CH3 C C CH CH is 1 5 2 4 3 2 4 3 How many number of atoms are there in a cube based unit cell having one atom on each corner and

52 The rusting of iron takes place as follows 2H 2e O H O 1 E 1 23 V 2 Fe 2e 2e Fe s E 0 44 V AGO for the net process is 1 322 kJ mol 1 3 152 kJ mol 1 2 161 kJ mol 1 4 76 kJ mol 1

A closed cylinder having volume 20 L contains 56 g N and 16 g He gases If pressure exerted by the gaseous mixture is 8 2 atm then the temperature of the gas molecules will be 245 2 K 333 3 K 425 5 K

A closed cylinder contains 320 g of O gas and 20 g of He gas If partial pressure of O in the cylinder is 5 atm then the total pressure of the gaseous mixture will be O 12 atm O 9 5 atm O 10 atm O 7 5 atm

2 3 CH C C CH 4 Cyclohexane Which of the following pairs of compounds are ring chain isomers 1 2 3 4 CH CH CH CH L I OH OH CH CI and CH CH3 and CH CH CH OH and and HO OH CH OH CH CH3

In Lassaigne s test for the detection of halogens the sodium fusion extract is first boiled with concentrated nitric acid This is 1 To dissolve Ag S 2 To remove silver halides 3 To decompose Na S and NaCN if present 4 Because Ag S and AgCN are insoluble in nitric acid

3 334 4 130 Consider the following reactions in which all the reactants and the products are in gaseous state 2PQP Q K 2 5 x 105 PQ 1 2R The value of K3 for the equilibrium 1 2P2 1 2Q2 1 2R PQR is 1 2 5 x 10 2 5 x 10 PQR K 5 x 10 3 5x 103 4 1 0 x 10 5

Q2 15 Points The feed gas contains 12 SO2 8 02 and 80 N enters the converter at 25 C The SO is completely converted to SO3 for the following reaction SO O SO3 and the product gas leaves the converter at 25 C 1 20 How much heat is transferred to the cooling coils from the converter per 100 g mole of the feed gas Consider basis of 100 g mole of the feed gas The enthalpy of SO2 and SO3 at 25 C and 1 atm are 296 9 and 395 2 kJ g mole respectively

Which of the following mixture of gases do not obe Dalton s law of partial pressure O NH3 and HCI O He and N O 02 and CO O Ar and Cl

hich is correct about Henry s law 1 The gas in contact with the liquid should behave as an ideal gas 2 There should not be any chemical interaction between the gas and liquid 3 The pressure applied should be high 4 All of these 4 mole ratio of pentar

Raoult s law is not applicable to which solution 1 Very dilute solution 2 Ideal solution 3 Solution with volatile solute 4 Solution with non volatile solute Th onour pressure of solution is than th

Consider the following statements a A molecule in the bulk of liquid experiences equal intermolecular forces from all sides b Molecules of a liquid on the surface have more energy than the molecules in the bulk c The highest energy state of the liquid will be when surface area is minimum The correct statements is are O a only Ob only O a and b only a b and c

2 A heat engine carries one mole of an ideal mono atomic gas around the cycle as shown in the figure below Process 1 2 takes place at constant volume process 2 3 is adiabatic and process 3 1 takes place at constant pressure Then the amount of heat added in the 1 2 is process Pressure a 3740 J 2 T2 600 K Adiabatic 1 T 300 K Volume b 3740 J 3 T3 455 K c 2810 J d 3228 J

5 The IUPAC name of the following compound is CH3 CH CH CH CH CH CH CHCH3 1 2 8 dimethyl 3 6 decadiene 2 1 1 7 7 tetramethyl 2 5 octadiene 3 2 8 dimethyl deca 4 6 diene 4 3 9 dimethyl 4 6 decadiene C H5

For the reaction PCIs g PC13 g Cl2 g The forward reaction at constant temperature is favoured by 1 Introducing an inert gas at constant volume 2 Introducing chlorine gas at constant volume 3 Introducing an inert gas at constant pressure None of those

Draw the monomer for the following polymer O JOH otn Draw the molecule on the canvas by choosing buttons from the Tools for bonds Ator and Advanced Template toolbars The single bond is active by default

15 Following radioactive disintegration follows first order kinetics MAMB a particles Starting with 1 mol of A in a 1L flask at 300 K pressure set up after two half lifes is approximately a 25 atm b 12 atm c 37 atm For the first order reaction T average life T half life d 40 atm TEOL

A closed cylinder contains 320 g of O2 gas and 20 g of He gas If partial pressure of O in the cylinder is 5 atm then the total pressure of the gaseous mixture will be 12 atm 9 5 atm 10 atm 7 5 atm

AAJ KA TOPPER The amount of solute molar mass 60 g mol that must be added to 180 g of water so that the vapour pressure of water is lowered by 10 is 1 60g 2 120g 3 30g 4 24g

53 If a 5 25 mass vol solution of a non electrolyte is isotonic with 1 50 mass vol solution of urea molar mass 60 is the same solvent then the molar mass of non electrolyte is 1 a 210 0 g mol c 115 0 g mol b 90 0 g mol 1 d 105 g mol 1 of pure liquids benzen

3 Two solutions A and B when taken separately I the same conductivity cell had a resistance of 40 2 and 60 2 respectively If equal volumes of both the solutions are mixed then the resistance of the mixture will be Assume that there is no increase in the degree of dissociation of A and B on mixing 1 48 Q 3 52 92 2 24 Q 4 38 2

4 None of these 32 The value of molar conductivity of HCl is greater than that of NaCl at a particular temperature because 1 Molecular mass of HCl is less than that of NaCl 2 Velocity of H ions is more than that of Na ions 3 HCl is strongly acidic 4 Ionization of HCl is larger than that of NaCl