Physical Chemistry Questions

Q 4 Draw the neat and clean diagram of tetrahedral void in CCP structure octahedral void in BCC structure 3 Q 5 The composition of sample wurtite is Fe0 930 What persentage of the Fe exist in Fe ion

Standard electrode potentials are Fe Fe E 0 44 V 3 Fe Fe E 0 77 V 3 If Fe Fe and Fe blocks are kept together will lead to BCECE 2015 A B C 3 increase in Fe decrease in Fe no change in the ratio of D decrease in Fe Fe Fe

How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes molar mass of calcium 40 g mol A 0 5 F C 0 25 F B D MHT CET 2016 1 F 2 F

Which one is correct order of coagulating value of electrolytes for a given Sb S3 sol 1 BaCl NaCl AICI 3 2 NaCl MgCl Al SO4 3 3 CaCl NaCI AICI3 4 Al SO4 3 CaCl NaCl 30 260

The pyrolysis of an ester follows a first order process and its rate constant can be expressed as Where k is given in min The time required for 25 reaction to complete at 42075 In k 78 09 T 227 C will be hr

An ideal gas is expanded so that the amount of heat transferred to the gas is equal to double the decrease in enthalpy Identify option s which are corre PV12 11 constant for triatomic non linear ideal gas Cm 2Cp OTV2 13 constant for monoatomic ideal gas 7 constant

82 A sample of 338 when kept at 298 K in a closed vessel shows a decay and B decay to give 226 Pb After t hour the volume of gas collected in the vessel at 1 atm 273K is found to be 89 6 ml Then which of the following is are correct for the nuclear process and the products of the process Mass of Pb obtained in time t hour 103 mg If the temperature is increased by 10 C then the time taken for the same amount of gas to be produced will be less than t hours a particles show more ionisation power than 3 particles Oy radiations undergo no deviation while traveling through electric or magnetic fields

In dilute aqueous H SO4 the complex diaquodioxalatoferrate II is oxidized by MnO4 For this reaction the ratio of the rate of change of H to the rate of change of MnO is JEE Advanced 2015 4 168 According to the Arrhenius equation

Which is an example of auto catalysis 1 Hydrolysis of methyl acetate acid catalysed 2 Oxidation of Na SO3 in presence of Na AsO3 3 Oxidation of oxalic acid by KMnO4 4 Formation of ammonia by Haber s process

Which of the following aqueous solution has minimum freezing point 0 01 m CaCl 0 05 m glucose 0 005 m MgCl 0 005 m MgSO4 Solution Answer 2 Higher the effective molality of solute minimum will

Q 7 Co ordination number in tetrahedral and hcp arrangements of metal atoms are respectively a 6 6 b 12 6 c 8 6 d 4 12 Q 8 For squire planer structure co ordination the radius ratio r r should be a 0 155 0 225 b 0 225 0 414 c 0 414 0 732 d 0 732 1 00

Hypochlorous acid HOCI a weak acid dissociates partially to form a hydrogen ion H and its conjugate base hypochlorite ion OCI in water Find the fraction of non dissociated HOCI with respect to the total concentration of HOCI and OCI at different pH values Plot the fraction of HOCI and OCI with respect to the total concentration HOCI OCI vs the pH of the solution Use pH values 3 6 9 and 12 for the plot Hint Define a HOCI HOCI OCI and a OCI HOCI OCI Plot a and a vs pH

Resistance of 0 2 M solution of an electrolyte is 50 2 The specific conductance of the solution is 1 4 S m The resistance of 0 5 M solution of the same electrolyte is 280 2 The molar conductivity of 0 5 M solution of the electrolyte in S m mol is 2 A 5 x 104 C 5 10 B D JEE Main 2014 5 x 10 3 5 x 10

Average Rate A R At A P At Then how can we include that 1 2 here when average rate is asked Please explain Sir Mam In a reaction 2HI g H g 1 g the concentration of HI decreases 0 6 M to 0 5 M in 10 minutes The average rate reaction during this interval is 0 05 M min 1 0 005 M min 1 0 01 M min 1 0 001 M min 1 Solution Answer 2 2HIH g 1 g 1 A HI A H A 12 2 At At At 1 0 6 0 5 0 005 M min 1 Average rate reaction

7 in which pair most efficient packing 1 point is present Ohcp and ccp Ohcp and bcc bcc and ccp Occp and simple unit cell 8 What is effect of frenkel defect on density of ionic solid increase O decrease remain unchanged not relationship between density and defect 9 In Schottky defect 1 point electron are trapped in some lattice site 1 point ion moves to interstitial position between the lattice point

0 6 g of a solute is dissolved in 0 1 L of a solvel develops an osmotic pressure of 1 23 atm at 27 C The molecular weight of the solute is 2 120 0 g mol 1 4 None of these 1 149 5 g mol 1 3 430 0 g mol

3 50 ml of 0 2 M NH 50 ml of 0 2M HCI 4 50 ml of 0 2 M NH 50 ml of 0 IM HCI 3 011 x 1022 atoms of an element weight 1 15 g 73 The atomic mass of the element is 1 2 3 3 4 6 For the reaction A 2B C 8 mole of A and 74 2 23 4 46 3 50 ml of 0 2 M NH 50 ml of 0 2M HCI 4 50 ml of 0 2 M NH 50 ml of 0 IM HCI 3 011 1022 1 15 a m 1 2 3 3 4 6 2 23 4 46 3A 2BC fer R A

Pls tell the easiest way to sdolve this problem 3 7 FeO crystallises in NaCl type lattice The crystal is however non stoichiometric as Fe 0 960 and deficient in iron Some cation sites are vacant and some contain Fe so that it becomes electrically neutral The of cation sites vacant are LE

Please explain how they write the equation inside the loga rithmic function Is the given equation is correct in the solution Please explain how to write the Ecell equation for such kin d of cell For E 0 76 V the E M F of the cell Pt s H g 1bar H aq 1M Zn aq 1 M Zn will be Zn zn 0 76 V 0 38 V Ecell 0 76 V 0 38 V Solution Answer 1 F cell 0 0591 2 Zn THTP log

The molal boiling point constant for water is 0 513 Km When 0 1 mole of sugar is dissolved in 200 0 g of water the solution boils under a pressure 1 0 atm at 2 100 0513 C 4 101 025 C 1 100 513 C 3 100 256 C

Which may be added to one litre of water to act a 55 buffer 1 One mole of CH COOH and one mole of HCI 2 One mole of NH OH and one mole of NaOH 3 One mole of NH Cl and one mole of HCI 4 One mole of CH COOH and 0 5 mole of NaOH I fand fun and for as a anted and CH COOHHCI 1 2 3 U H CNH Ca 1 He HCI 4 NH NaH CH COOH 0 5 NaOH

in heating an organic compound strongly with metallic sodium one frequently observes the formation of a blck material which is insoluble in water What might this black substance be and why is it formed

1 0 018 2 0 18 3 0 54 4 3 10 0 g of glucose 10 0 g of urea and 10 0 g of sucrose are dissolved in 250 0 mL of water at 273 K osmotic pressure of a solution The relationship between the osmotic pressure of the solutions is 2 3 1 TC 1 3 3 4 T

1 342 2 171 12 3 65 6 4 136 8 6 What mass of urea be dissolved in 171 g of water so as to decrease the vapour pressure of water by 5 1 15 g 2 20 g 3 25 g vo 4 30 g mperature of ideal

Benzene and toluene form nearly ideal solutions At 20 C the vapour pressure of benzene is 75 torr and that of toluene is 22 torr The partial vapour pressure of benzene at 20 C for a solution containing 78 g of benzene and 46 g of toluene in torr is A 50 C 37 5 B 25 D 53 5

Which one of the following pairs of solution is 52 not an acidic buffer 1 CH COOH and CH COONa 2 H CO and Na CO3 3 H PO and Na PO 4 HCIO and NaCIO fafafed face 1 CH COOH 7 CH COONa 2 H CO Na CO3 3 H PO N PO4 4 HCIO N CIO

4 None of these 40 mL of 0 1 M ammonia solution is mixed with 57 20 mL of 0 1M HCl What is the pH of the mixture pK of ammonia solution is 4 74 1 4 74 2 2 26 3 9 26 4 5 00 4 40 ft 0 1 M 3 faca 20 feft 0 HCI er pH 374 facra feg pk 4 74 1 4 74 2 2 26 3 9 26 4 5 00

Given 0 Mg 2 Mg EHg 2 Hg 2 37V 1 71V husnail 0 8V Ag Ag 0 79V Cu 2 Cu Select the correct statements s from the following AgNO3 can be stored in copper vessel Mg NO3 2 can be stored in copper vessel CuCl can be stored in silver vessel HgCl can be stored in copper vessel

7 The EMF of a concentration cell consisting of two zinc electrodes one dipping into M 4 solution of ZnSO and the other into M 16 solution of the same salt at 25 C is 1 0 0125 V 2 0 0250 V 3 0 0178 V 4 0 0356 V

3 2 1 4 1 414 1 The mass of a particle is 100 g and its radius is 87 2 x 10 cm If its velocity is 10 cm sec with measurement the 0 0001 uncertainty in uncertainty in its position is 1 5 2 x 10 m 3 5 2 x 10 m de confic 2 5 2 x 10 m 4 5 2 x 10 m 3 2 1 30 0001 feffurcan grit 1 5 2 x 10 m 3 5 2 x 10 m 4 1 414 1 102 104 10 estionpap 2 5 2 10 4 5 2 10 m m

Solubility products of Al SO4 is given by the 49 expression 1 K A1 SO 2 K A1 SO 1 3 K AI 1 SO 21 4 K A1 So Al SO4 fact 1 K A1 S2 2 K A1 So 1 3 K A1 SO 1 4 K A1 So Telegram ne questionpape

Name the members of the lanthanoid series which exhibit 4 oxidation states and those which exhibit 2 oxidation states Try to correlate this type of behaviour with the electronic configurations of these elements

What is the percentage degree of hydrolysis approx 56 N of KCN in solution when the dissociation 80 constant for HCN is 1 6 10 and K 10142 1 5 26 2 2 24 3 8 2 4 None of these 80 KCN HCN F fer 1 6 10 g Kw 10 4 1 5 26 2 2 24 3 8 2 4

what s wrong in my approach 2 40 Unattempted Questions 76 180 330 S cm mol The resistance of 0 1 M solution of electrolyte was found to be 200 ohm at 298 K using a conductivity cell of cell constant 0 66 cm The molar conductance of this solution is 33 S cm mol 1 3 33 S cm mol 1 0 33 S cm mol 1 Solution Answer 2 kx 1000 M 0 66 1000 200 0 1 k G HA 79 A R 33S cm mol Cell Constant Resistance Here unit of molarity as mentioned in the que is molar i e mol L and therefore 0 1M 0 1 mol L should be equal to 0 1mol 1000cm3 to get the

How many orbitals are associated with 4th energy 74 level 1 4 2 9 3 16 4 7 2 2 1 4 2 4T 2 9 2 2m 3 16 4 7

Using the Gibbs energy change AG 63 3kJ 79 for the following reaction A CO 3 2Ag aq CO aq the K of Ag CO s in water at 25 C is R 8314J K mol 1 3 2 10 2 8 0 10 12 3 2 9 10 4 7 9 10 fres at Rada AG 63 3kJ ffff25 C Ag CO 2Ag aq CO aq 3 Ag CO s K R 8 314 J K mol 1 3 2 10 26 2 8 0 10 12 3 2 9 10 4 7 9 10 2

e cyclic process for an ideal gas is shown below Here P V and T are pressure volume and temperature respectively The thermodynamic parameters q w H and U are heat work enthalpy and internal energy respectively JEE 2018 The correct option s is are Volume V A 9AC C AHCA AUCA and ar A P V T 19 AUBC and WAB P V V and Ac 9AC AUBC B P V T C 58001 bar C P V T Temperature T D 1450 bar B WBC P V V and BC AHAC D ABC AHAC and AHCA AUCA

3 Two platinum electrodes were immersed in a solution of CuSO and electric current was passed through the solution After some time it was found that colour of CuSO4 disappeared with evolution of gas at the electrode The colourless solution contains 1 Platinum sulphate 3 Copper sulphate 2 Copper hydroxide 4 Sulphuric acid

Radioactive decay can be described by the following equation In A In Ao kt where Ao is the original amount of the substance A is the amount of the substance remainin after time t and k is a constant that is characteristic of the substance For the radioactive isotope cesium 129 k is 2 17 x 10 2 hours 1 If the original amount of cesium 129 in a sample is 50 5 mg how much cesium 129 remains after 34 6 hours have passed mg

98 Given the ionic equivalent conductivities for the following ions K 73 5 cm ohm eq 2 eq 2 Al 149 cm ohm eq eq ASO2 85 8 cm ohm eq eq 4 The A for potash alum K SO AL SO 24H O is 4 eq 1 215 02 2 219 4 100 PA A

acetate and acetic acid in the ratio of x y and y x has ar electrode potential value E and E volts respectively a 25 C The pK value of acetic acid is 1 3 E E 2 0 059 E E 2 0 059 2 4 E E 2 0 059 E E 0 059

Topic ATOMIC STRUCTURE PERIODIC TABLE 16 What will be the pH of a solution having 10 M 46 H SO4 1 8 2 7 3 6 92 4 7 7 1 8 10 M H SO 34 2 7 3 6 92 4 7 7

When river water containing colloidal clay flows into the sea the major cause of silting is a accumulation of sand at the bottom c decreased salinity of sea water b flocculation and coagulation d micellization

Calculate the mass of N that is dissolved in the water inside a 240 L home aquarium at 297 K Atmospheric pressure is 1 02 bar the Henry s law constant KH for N at 297 K is 6 20 10 4 mol L bar the molar mass of N is 28 00 g mor and the atomosphere is 78 09 N2 33 3 g O 4 27 g O 4 27 10 2 g O 5 47x10 3g 03 330

Element B forms ccp structure and A occupies half of the octahedral voids while oxygen atoms occupy all the tetrahedral voids The structure of bimetallic oxide is JEE Main 2019 SAJ AB 04 C A B 0 B D A4B O A BO4

4 12 04 10 mol What will be the molarity of a solution which 55 contains 5 85 g of NaCl s per 500 mL 1 4 mol L 2 20 mol L 3 0 2 mol L 4 2 mol L 12 04 x 10 mol cal f ff 500 mL 4 3 5 85 g NaCl s 1 4 mol L 2 20 mol L 3 0 2 mol L 4 2 mol L

52 During the electrolysis of fused NaCl which reaction occurs at anode 1 Chloride ions are oxidized 2 Chloride ions are reduced 3 Sodium ions are oxidized 4 Sodium ions are reduced

16 tion of 92 A current strength of 1 0 A is passed for 96 5 s through 100 mL of a solution of 0 05 M KCl The concentration of the final solution with respect to OH ions is 1 0 005 M 2 0 05 M 3 0 01 M 4 0 001 M

A 1 M solution of H SO4 is electrolyzed Select right statement with products at anode an cathode respectively Given 2SO4 S 0 2e E 2 01 V H O l 2H aq 1 20 2 g 2e E 1 23 V a concentration of H SO4 remain constant H 02 b concentration of H SO4 increases O2 H concentration of H SO4 decreases O2 H d concentration of H SO4 remains constant S O2 H

Consider the following reaction and the kinetics plots below to answer the questions to the right 1 09 0 8 0 7 0 6 8 0 5 8 0 4 O 0 03 0 2 0 1 0 In concentration of H O 0 5 1 1 5 2 2 5 3 H O2 aq H O l 1 2O g O Figure 1 Plot of H O vs time 20 40 time s 40 Figure 2 Plot of the natural logarithm of H O vs time time s 60 60 80 80 100 Part A If the initial volume of the H O solution is 2 6 L what total amount of O in moles is formed in the first 20 s of reaction Hint Use Figure to answer this problem Express your answer in moles to two significant figures O 2 3 mol 1 1 mol O 1 4 mol O 0 57 mol Submit Part B Request Answer Based on the information provided what is the rate law for the decomposition of H O2 O Rate k O Rate K H O O Rate K H 0 O Rate K H 0 1