Physical Chemistry Questions

Na SO is added in water to make solution having density 1 2 g mL Correct statement for resulting solution is are a Nearly 0 96 mole of Na SO dissolved per kg of H O b Normality of Na ion is equals to normality of so2 ion c Molarity of solution is less than molality 1 a b 2 b only 3 c only

33 What is correct for 10 g of CaCO A It contains 1 g atom of carbon B It contains 0 3 g atoms of oxygen C It contains 12 g of calcium D It refers to 0 1 g equivalent of CaCO3 Which of the following is not correct regarding

For the following electrochemical cell Pt H H C M H C M H Pt at 25 C 1 atm 1 atm given that Acid CH COOH HCOOH COOH COOH 21 pk 5 4 4 and 6 2 If He in anodic half cell arises due aq and 0 01 M HCI is taken in cathodic half cell then EMF of the above cell is 1 0 059 V 2 0 118 V 0 0005W LAY COOK COOH 73

When 2 96 gm gaseous mixture of C H and C H gases is burnt completely in excess of O gas 8 8 gm CO and 5 04 gm H O vapours are formed The correct information s related with the initial mixture is lare A Equal moles of both the gases were taken B Equal masses of both the gases were taken C Mass ratio of C and H atoms is 30 7 D The total mass of oxygen used in combustion was 10 88 gm

Can electrons and protons be changed into neutrons like in neutron stars by any proces s and if so when and if it happens what wou Id be the structure of atom and could electri city flow through them and why does it hap pen

A mixture containing 2 0 mol each of H and O2 is ignited so that water is formed The amount of water formed is B 36 0 g D 3 60 g A 18 0 g C 1 80 g 1 2 g of Mg At mass 24 will produce MgO A F C 82 The most

D 11 2 L of helium at N T P 38 If NA is Avogadro s number then the number of oxygen atom in one g equivalent of oxygen is B NA 2 D 2 NA 9 Which of the following represents 1 g molecule A NA C NA 4 47 If H to

73 R The concentration of H and concentration of OH of a 0 1 M aqueous solution of 2 ionised weak acid ionic product of water 1 10 14 1 2 x 10 3 M and 5 10 12 M 2 1 x 10 3 M and 3 10 11 M 3 0 02 10 3 M and 5 x 10 11 M X 4 3 x 10 2 M and 4 x 10 13 M 4

92 Which of the following is a redox reaction 1 NaCl KNO3 NaNO3 KCI 2 CaC 04 2HCl CaCl2 H C 04 3 Mg OH 2 2NH4Cl MgCl 2NH4OH 4 Zn 2AgCN 2Ag Zn CN 2

When zeolites hydrated sodium aluminum silicate is treated with hard water the sodium ions are exchanged with 1 H ion 2 Ca ion 3 SO ion 4 OH ion Melami 1 HCH 2 HCH 3 mela 4 none 99 Green

6 What is the approximate pH of a solution composed of 0 2 M tyrosine and 0 02 M HCl Assume you are protonating the carboxyl group The three pK s for tyrosine are 2 2 9 1 and 10 1 side chain pK

14 4 1 0 The E for the following cell is 0 34 V In s In OH 3 aq SbO aq Sb s Using E 1 0 V for the In OH 3 In couple calculate E for the SbO Sb half reaction A 1 34 C 0 82 AA B B B 0 66 D 0 66

A solution is prepared by adding 55 00 g of fructose fruit sugar to 500 0 g of water at 30 C The partial pressure of water above the solution is atm The vapor pressure of pure water at 30 C is 4 19 x 10 2 atm The MW of fructose is 180 16 g mol

107 Which of the following statements is not correct for a nucleophile 1 Nucleophile is a Lewis acid 2 Ammonia is a nucleophile 3 Nucleophiles attack low electrons density sites 4 Nucleophiles are not electron seeking trig 1 2 3 112 IF

9 NO reacts with O to form NO When 10 g of NO is formed during the reaction the mass of O consumed is A 1 90 g B 5 0 g D 13 9 g C 3 48 g 0 The mass of 60 HCl by mass required for the

7 Which of the following has the highest mass A 20 g of sulphur B 4 mol of carbon dioxide C 12 x 1024 atoms of hydrogen D 11 2 L of helium at N T P 46

4 g of solid NaOH was dissolved in water and th solution was made up to 1000 ml The whole this will neutralized completely 1 100 ml of 1 M H SO4 2 20 ml of 2 5 M H SO4 3 20 ml of 1 5 M H SO4 mal

The wave functions of 3s and 3p orbitals are given by 0 angle with z axis 43s 9 P3P 1 1 1 2 Z a 3 2 6 3 2 4ZT ap 3 9 6 4x ag from these we can conclude 2zr 32 4 z 9 e Z3 cose Number of nodal surface for 3pz and 3s orbitals are equal The angular nodal surface of 3p orbital has The radial nodal surfaces of 3s orbital and 3pz orbitals are at equal distance from the nucleus 3s electron have greater penetrating power into the nucleus in

Table 1 Answers Q 16 Q17 and Q 18 by appropriately matching the information given in the three columns of the following table Column 2 Column 3 W 0 p q 0 AU 0 q q 0 AU 0 r q 0 AU 0 Column 1 a Reversible cooling of an ideal gas at constant volume b Reversible isothermal expansion of an ideal gas c Adiabatic expansion of non ideal gas into vacuum d Reversible melting of sulphur at normal melting point P Q R S W 0 W 0 W q Prob 16 Which of the following are the correct options A a P p C a P r A s q 0 AU 0 B a P q D a P s Sol Prob 17 Which of the following are the correct options A b R s B b Q p

An ideal gas undergoes through following cyclic process 1 2 Reversible adiabatic compression from P V T to P V T2 2 3 Reversible isochoric heating from P2V T2 to P3V3T3 3 4 Reversible adiabatic expansion from P3V3T3 to P4V4T4 4 1 Reversible isochoric cooling from P4V4T4 to P V T Efficiency of the cycle is Question Type Multiple Correct Type 1 2 3 1 3 T 17 12 2 T 1 T4 T T3 T2 1 r 1 1

b As the interaction between the nucleus and the electron determines the structure of the energy levels of the H atom any quantum object that has a positively and a negatively charged particle with no other interactions should have a similar structure of energy levels Consider a very unusual H atom where the positively charged particle is a positron the antimatter particle of the electron same mass as the electron but opposite charge Calculate the first two energy levels for this unusual atom in eV What wavelength in nm for a transition between these two energy levels

For the reaction N2O4 g 2NO2 g if initially only 4 atm N2O4 is present and at equilibrium total pressure of equilibrium mixture is 6 atm then the value of Kp is 1 2 atm 3 8 atm NCERT Pg 208 2 4 atm 4 16 atm

45 Molybdenum At mass 96 g mol crystallizes as bcc crystal If density of crystal is 3 23 10 3 g cm then radius of Mo atom is use N 6 102 A b 314 pm c 135 96 pm a 111 pm TAXI d none of these

The solubility of BaSO4 in water is 2 42 10 3 gL 1 at 298 K The value of its solubility product Ksp will be Given molar mass of BaSO4 233 g mol 1 NEET 2018 A B C D 1 08 10 10 mol L 2 1 08 10 12 mol L 2 1 08 10 8 mol L 2 1 08 x 10 14 mol L 2

A mixture of Li CO and Na CO is heated strongly in an open vessel If the loss in mass of mixture is Na 23 A 1 1 220 The molar ratio of Li CO and Na CO in the initial mixture is Li 7 9 B 1 2 C 2 1 D 11 4

An aqueous solution has urea and glucose in miss ratio 3 1 If the mass ratio of water and glucose in the solution is 10 1 then the mole fraction of glucose in the solution is A 1 9 B 110 3 C D 110 110 100 110

f the atomic number of an element X is 27 then deduce the possible values of four quantum numbe he 20th electron of element X 15 25 2p 363845 is

a 0 124 nm b 0 136 nm c 0 149 nm d 0 110 pm 39 The density of krypton face centered cubic cell is 3 19 g cm What is the radius of the atom Atomic mass Kr 84 a 0 198 nm b 0 221 nm c 0 206 nm d 0 225 nm 40 The face centered cubic cell of platinum has an edge length of 0 392 nm Calculate the density

3 Consider the following reaction of sodium thiosulphate with Cl Na S O3 aq 4Cl g 5H O 1 2NaHSO aq 8 HCl aq Choose the correct statement 1 0 3 mole of Na S O3 is required to react completely with 0 12 mole of Cl 2 0 24 mole of HCI will form from 0 12 mole of Cl on complete reaction 3 1 5 mole of water is required for the reaction of 0 12 mole of Cl 4 All are correct

4 The decomposition of N O according to the equation 2N O5 g 4NO2 g O2 g is a first order reaction After 30 min from the start of the decomposition in a closed vessel the total pressure developed is found to be 284 5 mm of Hg and on complete decomposition the total pressure is 584 5 mm of Hg Calculate the rate constant of the reaction 1991

38 8C At time t 0 initial mole of A is 1 3D Overall half life of the reaction is 15 days Then calculate the number of mole of C after 45 days if the ratio of k k kg is 4 2 1

13 4 1 0 What is the standard electrode potential for the reduction of HCIO HCIO aq H aq 2e CT aq H2O 1 Given Cr aq Cr aq e E 0 41 V HClO aq H aq 2Cr aq 2Cr aq Cl aq H O 1 E 1 80 A 1 39 C 1 22 A A B 1 54 D 0 90 You Missed

a 6 80 b 7 60 c 6 60 7 23 2 An element crystallizes in a face centered cubic lattice and the edge of the unit cell is 0 559 nm The density is 3 19 g cm What is the atomic mass a 87 6 b 79 9 c 85 5 83 9

By titrating vinegar with a standardized solution of sodium hydroxide the experimental acetic acid in the vinegar was determined and compared to the manufacturer s reported value DATA Volume of Vinegar Used mL Mass Vinegar Reported on Bottle Concentration of NaOH M Initial Burette Reading mL Final Burette Reading mL Volume of NaOH used mL Trial 1 5 00 mL Moles of NaOH Used mol Moles of Acetic Acid Reacted mol Mass of Acetic Acid Reacted g Molar Concentration of Acetic Acid M 5 0 25 2 01mL 11 01mL 9 ml CALCULATIONS Show one example calculation on the next page Trial 1 Trial 2 5 00 mL 5 0 25 11 01 mL 19 97 mL 8 96 mL Trial 2 Trial 3 Trial 3 5 00 mL 5 0 25 19 97mL 28 71 mL 8 71 mL Average

Kinetics of acidic hydrolysis of ester is pseudo I order reaction CH3COOCH3 aq excess 1 H1 CH3COOH aq CH3OH aq Rate law is given by r K H H 0 CH3COOCH3 K 1 8 10 3 M 2 sec 1 where H ion concentration is given by acid catalyst In an experiment IM CH3COOCH3 is hydrolysed using 0 1M HCI as catalyst Reaction mixture is titrated against standard NaOH solution at different times If initially 10 ml of NaOH was required while after long time 100 ml of NaOH is required then find volume of NaOH required at 230 3 sec Options 1 O 91 ml 2 O 81 ml 3 O 75 ml

Algen 57 32 841 016 NH Ha S OH 14 143 04 1 1 0 286 2 SH OH AH 46 228 88 KJ 46 K 436 kJ 3H NH s will Jord 16th 1 142 X 112 Kind s avg Gond enthalpy if 352 45 X 3 436 3m taxi 450

The following data were obtained at a certain temperature for the decomposition of NH in contact with tungsten P mm initial 100 Relative in min t 2 20 5 then what will be the order of the reaction 200 10 400

Illustration 3 23 Calculate the volume strength of H O solution if 50 mL of H O solution is diluted with 50 mL of H O 20 mL of this diluted solution required 40 mL of M 60 K Cr O solution in presence of H SO4 for complete reaction Sol HO

2 mol water is taken into 8 21 L vessel at 300 K Amount of water present in vapour when vapour pressure of water at 300 K is 0 05 atm is Assume the volume taken by H 0 1 as negligible A B C 0 1 g 0 2 g 0 3 g

23 Sorption is the term used when 1 Adsorption takes place 2 Absorption takes placed begg 3 Both take place 4 Desorption takes place

Narayana is a student of 12th class In one of his exams the following question was asked A truncated hexahedron has atoms A at all facecentres atoms B at all corners atoms C at all edgecentres and atom D at body centre What is the formula of the compound He does not know the contribution of various particles in truncated hexahedron to each unit cell He had made following assumptions given in table to solve the question and reported answer as AaBbCcDd simplest whole number ratio Contribution to each unit cell SNO 1 2 3 4 5 6 Particle of truncated hexahedron Body centre Corner Face centre of triangular face Face centre of hexagonal face Face centre of octagonal face Edge centre OCOnat is the value of cxd a b in his answer JOT OND Same as hexahedron Same as hexahedron 1 2 1 4 1 72 1 GROUP

4 0 75 0 25 The dissociation constants for acetic acid and HCN at 25 C are 1 5x10 5 and 4 5x10 10 respectively The equilibrium constant for the equilibrium CN CH3COOHHCN CH COO would be 1 3 0 x 10 5 30 104 Prelims 2009 AIPMT 2 3 0 10 4 4 3 0 105 ont

29 Lithium crystallizes as body centered cubic crystals If the length of the side of unit cell is 350 pm the atomic radius of lithium is d 123 7 pm a 303 1 pm b 606 2 pm c 151 5 pm 0 Gold has a face centered cubic lattice with an edge length of the unit cube of 407 pm The

0 5 grams of a week base BOH present in 50 ml solution is titrated with 0 1 M HCI T pH at half neutralization is found to be 9 and the pH at equivalence point is found be 5 15 The equivalence conductance of BOH at infinite dilution is 400 Scm eq Choose correct option s THE NADAYANA GROUP A Initial concentration of BOH is 0 1 M B pK of BOH is 9 C degree of dissociation of BOH is 0 01 C conductivity of BOH solution is 4x10 Sem

Incorrect statement among the following is are a 1 g atom of oxygen is No times heavier than 1 atom of oxygen b 1 m of H g at STP weighs 89 2 g c Blue vitriol and green vitriol are isomorphous substances 1 a only 3 b only 2 b c only 4 c only

46 What is the coordination number of an atom for an element crystallizing with a cubic latt Calculate the corresponding coordination number for the simple fcc and bcc lattices a 12 sc 12 fcc 8 bcc b 6 sc 14 fcc 8 bcc d 6 sc 12 fcc 8 bcc c 8 sc 12 fcc 6 bcc

10 ml of a gaseous mixture containing C H and C H exactly requires 40 ml O for complete combustion and produces 25 ml CO and 30 ml H O vapour The correct information s is are A Total volume contraction 5 ml B Volume contraction due to combustion of C H 0 C x 4 D Volume of CH in the initial mixture 5 ml

Select process which is are exothermic AH ve Question Type Multiple Correct Type 1 2 3 He g Lig He g O g S g O g S g Conversion of tetrachloridocobaltate II ion to hexaaquacobalt II ion in aqueo solution dioxygenium ion e molecular oxygen

6 Arsenic III sulphide forms a sol with a negative charge Which of the following ionic substances should be most effective in coagulating the sol 1 KCI 2 MgCl 3 Al SO4 3 4 Na3PO4

Which of the following statements is incorrect A Ammonium salts on reaction with strong alkalies produce a non inflamable gas B fac Co NO3 3C13 is non chiral C Solid potassium dichromate and concentrated H SO4 liberates chlorine gas with solid sodium chloride D The increasing order of paramagnetic properties amongst VCI3 VOSO4 Na3VO4 V H O 6 SO4 H O is Na3VO4 VOSOA VCI IV H O ISO H O