Physical Chemistry Questions

9 1 6 g of an organic compound gave 2 6 g of magnesium pyrophosphate The percentage of phosphorus in the compound is 1 45 38 2 54 38 3 37 76 4 10 02

Which of the following statement s about Frenkel defect is are true O Some of the lattice sites are vacant An ion occupies interstitial position Some of the cations are replaced by foreign ions Density of the solid remains unaffected

Identify the correct statement in relation with the following reaction Zn 2HCl ZnCl2 H Question Type Single Correct Type 1 Zn is acting as an oxidant 2 Chlorine is acting as an oxidant 3 Zn is acting as reductant

ons 107 Structure of the compound whose IUPAC name is 3 Ethyl 2 hydroxy 4 methylhex 3 en 5 ynoic acid is OH COOH 1 ed conc added to 2 3 OH OH OH COOH COOH COOH COOH

The amount of work done to increase the temperature of one mole of an ideal gas by 50 K if the gas is expanding under condition VT 23 constant R 831 mol K A 415 5J B 623 25 J C 277 D 601

4 The coordination number is 6 50 Equimolar solutions of HF HCOOH and HCN at 298 K have the values of Ka as 6 8x10 4 1 8x10 4 and 4 8x10 9 respectively What will be the order of their acidic strength 1 HF HCN HCOOH 2 HF HCOOH HCN 3 HCN HF HCOOH AAJ KA TOPPER 4 HCOOH HCN HE 1 Which of the following statements is not true regarding molecular orbital theory

4 Gases will occupy a definite space The increasing order of crystal field splitting strength of the given ligands 1 NH C CN F C0 H 0 2 F C NH CN H 0 C0 3 CF F H 0 NH CN CO 4 CO CN NH H O F CT

fructose 6 phosphate glucose 6 phosphate K 1 97 What is AG for the reaction Kq measured at 25 C AG Incorrect If the concentration of fructose 6 phosphate is adjusted to 1 1 M and that of glucose 6 phosphate is adjusted to 0 55 M w is AG

he decomposition of N O5 in CCl4 is studied by monitoring the concentration of N2O5 in the solution Initially the oncentration of N O5 is 2 33 molL 1 and after 184 minutes it is reduced to 2 08 molL 1 The reaction takes place ccording to the reaction EN2O5 9 4NO2 g O2 g the average rate of this reaction is x x 10 2molL 1 hr 1 calculate x

In a certain chemical reaction AH 150 kJ and AS 10 Question Type Single Correct Type 1 2 3 K at 300K The value of AG is 4 138 kJ 138 kJ 147 kJ 147 kJ

A buffer solution is prepared by mixing 10ml of 1 0 M acetic acid 20ml of 0 5 M sodium acetate and then diluted to 100ml with distilled water If the pk of CH COOH is 4 76 What is the pH of the buffer solution prepared a 1 3 84 3 4 34 2 4 76 4 5 21

Which gas shows real behaviour 16 g of dioxygen at STP occupies 11 2 L One gram dihydrogen in 0 5 L flask exerts pressure of 24 63 atm at 30 One mole of ammonia at 300 K and 1 atm pressure occupies 22 4 L

2AB g B g 2AB 2 8 The degree of dissociation is x and is small compared to 1 The expression relating the degree of dissociation x with equilibrium constant K and total pressure P is a 2K P 1 2 c 2K P P b K P d 2K P 3 2008

The ratio of area of orbit of first excited state of electron to the area of orbit of ground state for hydrogen atom will be A 16 1 B 4 1 C 8 1 BIOLOGY D 1 8

hard acid O O O O a is not very polarisable O b large ionic radius c show a preference for donor atoms of low electronegativity d show a preference for donor atoms of high electronegativity

The solubility of salt in saturated aqueous solution of NH4KHPO3 is Question Type Single Correct Type 1 2 3 4 Ksp 1 3 Ksp 4 1 3 Ksp 1 4 Ksp 1 4

A mixture of 100 m mol of Ca OH 2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL The mass of calcium sulphate formed and the concentration of OH in resulting solution respectively are Molar mass of Ca OH 2 Na SO4 and CaSO4 are 74 143 and 136 g mol respectively Ksp of Ca OH is 5 5 x 10 6 JEE Main 2019 2 13 6 g 0 28 mol L 1 4 1 9 g 0 28 mol L 1 1 1 9 g 0 14 mol L 1 3 13 6 g 0 14 mol L 1 visi

The wave function for an electron in a hydrogen atom is y Ne Here r is the distance from the distance from the nucleus to the electron and a is Bohr radius Calculate the normalization factor N 1 2 A za B 1 a 1 2 C B 1 7

Consider the following electrochemical cell at 298K Ag s Agl s 1 aq C aq Hg C Hg Pt s Given Ec creC H 0 26V E 0 8V K Agl 10 and The overall reaction occurring in the above all is 1 Hg Cl s Ag s I aq Hg f Cl aq Agl s 2 Ag aq aq Agl s 3 Hg aq 1 CC aq Hg Cl s 4 Cell reaction is not possible RT 0 06 2 303RT F

Upon mixing equal volumes of 0 02 M AgNO3 0 16 M KCN solutions Assume no hydroly ion Given Ag aq 2CN aq Ag CN aq Kc 10 8 A NO 0 01 M K 0 08 M C Ag CN 0 01 M In the above question B 4 Ag is about A 2 78 x10 18 M C No free Ag ions will be left in the solution B CN 0 06 M D All of these B 1 67 x 10 1 M D Cannot be determined C

Determine the degree of association polymerization for the reaction in aqueous solution if observed mean molar mass of HCHO and C6H12O6 is 150 NET ot 6HCHO a 0 50 b 0 833 C6H12O6 c 0 90 T d 0 96 MTH Mous

At 100 K temperature A2 g is 50 dissociated into B g and C g as pel the reaction A2 g B g C g at 1 atm pressure The Gibbs energy change at this temperature is O 100 RIn3 O 100 RIn3 O 230 3 RIn3

A2 B2 2AB R O R K A a B b Initial A Initial B R O R r Ms 1 0 2 0 04 0 4 0 04 0 4 0 08 0 2 0 1 0 2 Order of reaction with respect to A2 and B2 are respectively Question Type Single Correct Type 1 2 3 a 1 b 1 a 2 b 0 a 2 b 1

If 20 mL of 0 1 M NaOH is added to 30 mL of 0 2 M CH3COOH pKa 4 74 the pH of the resulting solution is Question Type Single Correct Type 1 2 3 4 44 9 56 8 96

At 570 mm Hg and 298 K a gas sample has a volume of 2270 mL What is the final pressure in mm Hg at a volume of 1250 mL and a temperature of 448 K if the number of moles are constant O 700 mm Hg O 690 mm Hg O 210 mmHg 1560 mm Hg O 470 mm Hg

43 Which of the following statement s is are false A A S for N g N g is positive 2 AG is always zero for a reversible process in a closed system system C AG for an ideal gas is a function of temperature and pressure D Entropy of a closed system is always maximized at equilibrium

For the reversible isothermal expansion of one mole of an ideal gas at 300 K from a volume of 10 dm to 20 dm AH is 1 1 73 kJ 3 3 46 kJ 2 1 73 kJ 4 Zero Old CO g at 977 C

Which of the following is wrong in case of Langmuir adsorption isotherm Option A B C D It is theoretically based on kinetic theory of gases Langmuir assumed that every adsorption site is not equivalent Rate th Ability of particle to bind adsorption site is independent of near by site wheth or not Langmuir adsorption isotherm does not work well for chemisorption ution it is occup

Potassium metal is commercially prepared by the reduction of molten KCI with metallic sodium a 850 C This method is based upon the following principle Option A B C D Sodium is more reactive than potassium at this temperature Potassium being more volatile distills off thus shifting the reaction forward Sodium prefers to bind to chloride ions in preference to potassium ions Rate this e Potassium and sodium form an alloy at this temperature

One mole of one of the sodium salts listed below having carbon content close to 14 3 produces 1 mole of carbon dioxide atomic mass KVPY 2016 upon heating Na 23 H 1 C 12 0 16 The salt is a C H5COONa b NaHCO3 c HCOONa d CH3COONa

Question No 40 If the kinetic energy of electron in nth shell of H atom is K then its potential energy in nth shell will be O K K 2 O 2 K O 2K

One coulomb of charge is passed through a solution of AgNO and CuSO connected in series and the concentration of two solutions are in the ratio 1 2 The ratio of weight of Ag and Cu deposited on Pt electrode is 1 107 9 63 54 3 107 9 31 77 2 4 54 31 77 54 63 54

Formula AgBrO3 MgSO4 CaCO3 Solubility product 2 5 10 10 2 7 x 10 27 2 7 x 10 18 FeC 04 2 4 x 10 15 Which of the following salt having maximum solubility Question Type Single Correct Type 1 2 AgBrO3 MgSO4

A solution contains 0 001 M Pb2 and 0 001 M Agt What happens when KI s is added to bring I concentration to 0 0001 M Ksp Pbl 1x10 10 Ksp Agl 8 10 17 A Pbl2 selectively precipitates B Agl selectively precipitates C Both Pbl and Agl precipitate D Neither Pbl2 nor Agl precipitate

A straight glass tube has two inlets x and y at two ends The length of the tube is 200 cm HCl gas through inlet x and NH gas through inlet y are allowed to enter the tube at the same time White fumes first appear at a point P inside the tube Find the distance of P from x Sol According to Graham s law of diffusion

The standard lattice enthalpy of NaCl is AsubH Na 108 4 AH Na 496 AbondH Cl 242 AegH CI 348 6 and AfH NaCl 411 2 All data is in kJ mol O 514 kJ mol 1 O 642 kJ mol 1 O 788 kJ mol 1 927 kJ mol 1

57 pk a H NCHCOOHH N CH COOH N CH COO R A 2 3 pk 9 7 a2 R B R C Which of the following statements is are correct A at pH 2 3 half of A is converted into B B at pH 6 B is at its maximum C at pH 6 the solution having the above equilibrium becomes non conducting D pH 9 7 is called isoelectric point

Which of the following is not permissible set of quantum numbers O n 5 1 4 m 0 s On 4 1 0 m 0 s N O n 3 1 1 m 1 s O n 2 1 0 m 1 s 2 2 1 2 12

Atomic mass of magnesium is 24 amu it means that an atom of magnesium is 24 times heavier than one twelfth of mass of a carbon atom C 12 24 times heavier than the mass of a carbon atom C 12 4 times heavier than the mass of a carbon atom C 12 2 times heavier than one twelfth of mass of a carbon atom C 12

A 4 by 4 m horizontal heater is placed in room air at 15 C Both the top and the bottom surfaces are heated to 50 C Estimate the total heat loss by free convection A horizontal plate uniform in temperatura ot 100K har 41

Which transition emits photon of maxim frequency 1 second spectral line of Balmer series 2 second spectral line of Paschen series 3 fifth spectral line of Humphery series 4 first spectral line of Lymen series

0 5 1 5 2 2 5 3 1 The volume of oxygen required for complete combustion of 20 ml of ethene is 1 30 ml 260 ml 3 40 ml 4 50 ml to produce the sufficient quantity of eart

1 The maximum number of atomic orbitals associated with a principal quantum number 5 is 1 9 2 12 3 16 4 25 2 For a d electron the orbital angular momentum is in a gi 2 I giv 3 n gi 4 sg orbital 7 The m 3 are 1 2

39 Which of the following factors will favour the backward reaction Cl g 3F g 2CIF g AH ve Addition of inert gas at constant pressure Increase in temperature B Addition of Cl gas Increasing the volume of the containe

Which one of the following options is correct if the activation energies of two reactions are Ea and Ea2 with Ea Ea2 and if the temperature of the reacting systems is increased from T to T A B kl K k K k K 24 24 K2

Q 12 The E 4 1 00 21 M M values for Cr Mn Fe and Co are 0 41 1 57 0 77 and 1 97 V respectively For which one of these metals the change in oxidation state from 2 to 3 is easiest O Fe OMn 0

How many moles of methane are required to produce 22 g of CO after combustion A 1 B 2 C 1 5 D 0 5 If in a voltmeter there are 20 divisions between 0 to 0 5 what is the least count of voltmeter A 0 025 C 0 25 B 0 05 D 0 002

Q 16 Zn E for Fe 2e Feis 0 44 V and E for O 4 1 O 00 21 2e 2e Zn is 0 76 V thus Zn is more electropositive than Fe Zn is more electronegative than Fe Fe is more electropositive than Zn

13 Aqueous solutions of HNO KOH CH COOH and CH COONa of identical concentrations are provided The pair s of solutions which form a buffer upon mixing is are A HNO and CH COOHMA B KOH and CH COONa OHNO and CHCOONa CH COOH and CH COONa 3

On increasing the temperature the increase in conductivity of intrinsic semiconductor is due to A Decrease in band gap between valence band and conduction band B Increase in electrons in conduction band C Increase in negative charged electrons than positive holes in valence band D Increase in electrons in valence band