Physical Chemistry Questions

3 5 0 10 15 4 0 2 10 17 Solubility product of silver bromide is 5 0 10 3 The quantity of potassium bromide molar mass taken as 120 g mol to be added to 1 L of 0 05 M solution of silver nitrate to start the precipitation of AgBr is 1 1 2 x 10 10 g 3 6 2 10 5 g 2 1 2 10 g 4 5 0 10 8 g

RT 80 32 2048x2 63 The rate constant for a first order reaction at 300 C 63 300 C a fan for E 35 KCal for which E is 35 KCal mot and frequency constant is mot ferich 1 45 x 10 1 s1 1 45 x 1011 s will be 1 10 x 10 75 1 2 5 37 x 1010 1 3 5 x 1045 1 4 8 x 10 45 1 The degree of dicci 76 x 2 3 lug 24 25 30 1 43 35 X10 PM RT ferich 1 10 x 10 5 1 2 5 37 x 1010 1 3 5 x 10 45 1 4 8 x 10 45 1 80 40 110 fogkeq tog K A 2 logk log A 89 4

12 The rate constant of a certain reaction is given by log K B C log T Then activation energy of reaction at A T 300 K is B 1 Clog T T 3 Clog T 2 2 303 B CT R 4 B CTR

2 4 4 1 3 29 Calculate the energy of a photon of sodium light of wave 69 44 folucnt 1368 length 5 862 x 10 6 m in Joules 4 1 3 mX10 17177 105 1441 1 3 35 x 108 J 2 3 38 x 10 10 J 3 3 38 x 10 12 J y 4 2 38 x 10 16 J 20 14 41 1360 1362 2000 4 1368 42 5 862 x 10 16 1 3 35 x 10 8 J 2 3 38 x 10 1 J 3 3 38 x 10 12 J 4 2 38 x 10 16 J Y 1800 6 82 10 37 8 662 X10 6620 62

46 The quantum numbers of four electrons are as follows 1 Electron 1 ii Electron 2 1 Electron 3 n 3 3 4 1 0 0 m 2 1 0 0 5 1 222 1 2 1 2 iv Electron 4 3 1 2 2 The correct order of decreasing energies of these electrons is 1 Electron 2 Electron 1 Electron 3 Electron 4 2 Electron 4 Electron 3 Electron 1 Electron 2 3 Electron 4 Electron 3 Electron 2 Electron 1 4 Electron 1 Electron 2 Electron 4 Electron 3 47 If the radius of first orbit of H atom is a then de Broglic Class XIII Spartan Batch Chemical Arithmetic Atomic Structure Solid State 46 1 Electron 1 ii Electron 2 iii Electron 3 iv Electron 4 n 3 3 4 3 1 0 0 2 m 1 0 0 2 5 12 12 1 2 1 2 1 Electron 2 Electron 1 Electron 3 Electron 4 2 Electron 4 Electron 3 Electron 1 Electron 2 3 Electron 4 Electron 3 Electron 2 Electron 1 4 Electron 1 Electron 2 Electron 4 Electron 3

tion 24 4 Unilayer adsorption So 70 N 0 decomposes to NO and O and follows first order 0 N O NO kinetics After 50 minutes the pressure inside the vessel increases from 50 mm Hg to 87 5 mm Hg The pressure of the gaseous mixture after 100 minute at constant temperature will be 1 136 25 mm Hg 2 106 25 mm Hg Ae K 3 175 0 mm Hg 4 116 25 mm Hg 1 45 x A compound A CH on hydrolysis gives CH O which z CH 89 RT 3 fe 4 rata suferitor GRAT 150 HERO 87 5 mm Hg a 100 2 3x8 X13 3 25 290 few data for a 374 TO ERM 50 mm Hg 1 136 25 mm Hg Noos 2 N03 2 106 25 mm Hg P 435 SO 3 175 0 mm Hg 4 16 25 mm Hg 72 5 87 24 2 P 21 SP n 30 Cap o ligir

6 In which of the following reactions heat is known as standard heat of formation of CO liberated 1 2CO g O2 g 2CO2 g 0 2 8 2 C diamond 135 6 kcals CO 94 5 kcals 2 g 3 C graphite 2 g 0 CO 2 8 4 CH 202 g 2CO2 g 2H O 1 2128 kcals 94 05 kcals

The conductance of a salt solution AB measured by two parallel electrodes of area 100 cm separated by 10 cm was found to be 0 0001 2 If volume enclosed between two electrode contain 0 5 mole of salt what is the molar conductivity S cm mol of salt at same conc Express your answer as molar conductivity in S cm mol x 100 2 X 10cm 100cm Y POCO SHOT ON POCO F1

The boiling point elevation constant for toluene is 3 32 k kg mol 1 The normal boiling point of toluene is 110 7 C The enthalpy of vaporization of toluene would be nearly 17 0 kJ mol 1 34 0 kJ mol 1 50 1 kJ mol 1 68 0 kJ mol 1

a x y b x y c x y d We cannot predict 145 What is the molarity of Fe CN in a saturated solution of Ag4 Fe CN 6 K 1 6 x 10 41 a 1 6 x 10 8 b 5 2 10 8 c 2 0 10 8 d 2 3 10 9 4 5 T

In nitrogen atom three 2p electrons reside in different orbitals whereas in oxygen atom two of four 2p electrons must occupy the same 2p orbital resulting in increased repulsion therefore ionization enthalpy of N is greater than that of O

For an ionic compound lattice energy magnitude only is 30 kJ and combined hydration energy of ions magnitude only is 40 kJ Enthalpy of solution of the compound is DA 70 kJ OB 10 kl Oc 10 kl D 70 kJ

the degenerate orbitals When several electrons occupy a set of degenerate orbitals the lowest energy state corresponds to the maximum possible extent of single occupation of orbital and parallel spins Hunds rule The loss of exchange energy increases the stability As the stability more difficult There is no loss of omes

reaction The reaction X 2Y Z N occurs by the follow mechanism i X Y M very rapid equilibrium ii M ZO slow iii O Y N very fast What is the rate law for this reaction 1 Rate k Z 3 Rate k N The rate of the reaction 2 Rate k X Y z 4 Rate k X

1 P 3 12 12 2 p 11 25 MaxP 3 x p NH3 g NH3 g H S g observed pressure 65 NH4HS s 2 x 1 P 4 x 1 p4 65 For NH HS for reaction mixture at equilibrium is 1 12 atm at 106 C the value of K for the reaction is 1 3 316 atm 2 0 3136 atm 3 31 36 atm 4 6 98 atm The size of particles in suspension true solution and colloidal 2500 76560 308 2pop JP 1 21 48 1 4 2 4 1 3 316 atm 20 3136 atm 3 31 36 atm 4 6 98 atm 2 x NH3 9 1 12 atm 1106 C 8 7 5 815 3 24 27 2 75 9 563 337 280X 393

b 10 c 2 10 d 2 x 10 142 What is the concentration of Pb 2 when PbSO4 K 1 8 x 10 8 begins to precipitate from a sp solution that is 0 0045 M in SO2 a 4 0 x 10 8 M 4 b 1 0 x 10 6 M 2 143 What is the con c 2 0 x 10 8 M d 4 0 x 10 6 M

4 All 4 47 When an electron moving with a speed of 600 ms 1 with 47 600 ms n qu gu us d gia xfafradal an uncertanity of 0 005 then calculate the uncertainity in 0 005 azia n feefa fred og position of electron 1 1 4 x 10 3 m 2 1 9 10 3 m 3 2 9 x 10 3 m 4 3 9 x 10 3 m Teoman effect explains splitting of spectral lines in 1 1 4 x 103 m 2 1 9 x 103 m 600 X 0 005 X 9 1 X 4 X 3 4 3 2 9 x 10 m 4 3 9 x 103 m fatt 6 627 10 DXX DV 220 6 1 103 662x10 34 Dx DP DAT 0x skom h An

b Match the polymer of column I with correct monomer of colu Column I Column II i High density polythene ii Neoprene iii Natural rubber iv Teflon v Acrilan a Isoprene b Tetrafluoroethene c Chloroprene d Acrylonitrile e Ethene

In the process of reverse osmosis the concentrations of inlet water pure water and discarded water are C C and C3 respectively Which of the following represents the correct relation between them O C C C3 O C C C3 O C3 C C

A sample contain only hydrog minimum number of atoms required if total seven lines are observed in emmission spe Electron in a single electron species having atomic number Z make a transition from 2 to 1 The emitted photon 2n 3n 6Z Given 5 is absorbed by excited electron of Li in n orbit and further excite to n orbit The energy of atom is 13 6 Z n eV atom in nth orbit e following statements and identify how many statements are correct

A B D XeF2 CO32 Bond angle 2p o 1s Number of nodal plane Correct Answer N N N Order of bond length 02 02 Order of magnetic moment

mass taken as 120 solution of silver is g 2 is 22 The acid ionization hydrolysis constant of Zn 1 0 10 What is the pH of 0 001 M solution of ZnCl 23 If 50 ml of 0 2 M NaCN is mixed with 50 ml of 0 2 M

In SCQ which of the following transformations the bond order has increased and the magnetic behaviour has changed A C C B NO NO en C C 02 0 Corect Answer

Column I 1 mole of 0 1 mole of SO 4 gm of He 1 gm of H P Q S T Column II Occupies 22 4 lit at 1 atm 0 C Weighs 32 gms A Collection of N units of given sub Occupies 12 3 lit at 1 atm and 30 Contains 2 g atom of oxygen

Which of the following statements is correct for the spontaneous adsorption of a gas Question Type Single Correct Type 1 AS is negative and therefore AH should be highly positive 2 AS is negative and therefore AH should be highly negative 3 AS is positive and therefore AH should be negative AS is positive and therefore AH should also 4

CAREER INSTITUTE 51 34 05 mL of phosphorus vapour weighs 0 0625 g at 546 C 5 546 C a 0 1 bar d 34 05 mL and 0 1 bar pressure What is the molar mass of 0 0625 91 TRENRE DE phosphorus A 1 118 42 g mol 2 123 42 g mol 3 128 42 g mol 4 119 42 g mol 546 213 820 1 118 42 g mol 2 123 42 g mol 3 128 42 g mol 4 119 42 g mol 620x6 10X34X10 34 X164 625 X164 X108 X820 mw

Answer the following question 2 Suppose in a twenty item test in math 14 student scores are 10 8 7 11 4 12 6 16 9 7 8 9 17 15 If your score belongs to the third quartile or Q3 What is your score Show your illustration using the Moore and McCabe method A

6 The first and second dissociation constant of an acid H A are 1 0 x 10 5 and 5 0 x 10 10 respectively The overall dissociation constant of the acid will be 2 5 0 10 5 4 0 2 105 1 5 0 x 10 5 3 5 0 10 15

The enthalpy of formation of methane at 300K is 75 83 kJ mol What will be heat of formation of methane at constant volume at the same temperature Question Type Single Correct Type 1 85 52 kJ mol 2 40 33 kJ mol 3 78 32 kJ mol

An electron starting from rest takes 14x10 9 sec to reach from one plate to other of a capacitor placed 2 cm apart If charge to mass ratio of electron is 1 8x1011 CI kg Then find the potential difference between the plates Ans V 2400 Volt

examples of homogeneous mixtures In contrast to this in a heterogeneous mixture the composition is not uniform throughout and sometimes different components are visible For example mixtures of salt and sugar grains and pulses along with some dirt often stone pieces are heterogeneous mixtures You can think of gasy many more examples of mixtures which you id come across in the daily life It is worthwhile to to a ges Placeg are ons of mixture can be separated by using physical simple such mention here that the components of a Homo SAILLAL CAMERA ethods 2 as Neres

Consider a first order decomposition process 3 4342 A plot of concentration of A3 and A2 versus time is show below At time t4 percentage of reactant decomposed is Concentration tA A A3

fritt fo 62 If P V M T and R are pressure volume molar mass 62 P V M TUR 23 314 CR 504414 temperature and gas contant respectively then for an ideal gas the density is given by 3 1 2 3 RT PM 4 RT E 87 5 87 5 g 375 6 195x 7000XX 76562 1 2 RT RT 3 V P SRT MW PM RT 50 251 2 3016 80 32 2048x2 PM RT RT The rate constant for a first order reaction at 300 C 63 300 C f fe at 3711 af E 35 KCal for WE

33 produces 1 CH CH CHCH 1 Br CH CHCH 3 Br 4 Treatment of cyclopentanone 1 2 C6H CH CH CH CH CH CHCH CH T Br A methyl lithium gives which of the following species 1 Cyclopentanonyl cation 2 Cyclopentanonyl radical 3 Cyclopentanonyl biradical 4 Cyclopentanonyl anion HB Re AIPMT 2015 5 In the reaction with HCl an alkene reacts in accordance with the Markovnikov s rule to give a product 1 chloro 1 methylcyclohexane The possible alkene is 2 CH HC0277 B 0 with CC0278

Find bond enthalpy of C 0 in kJ mol using following informations AHatomisation C s 700 kJ mol AHf CO g 400 kJ mol BEO 0 500 kJ mol kJ mol Resonance energy of CO2 150

Half liter each of three samples of H O labeled as 10 vol 15 vol and 20 vol are mixed and then each diluted with further half liter of water The volume strength of resultant H O solution is 1 5 5 2 6 5 3 7 5 85

Consider the following equilibriu 2A g B g C g 3D g At the approach of equilibrium concentrations of A B and C are 0 5 M 3M and 1 5M respectively At the start of the reaction C was absent but D was present initial concentration of D 0 5 M Identify the correct statement A the concentration of D at equilibrium is 4 5 M B K 250 M C K A B C D at equilibrium D addition of helium at constant pressure to the equilibrium mixture would push equilibrium backward 25

Mass of a substance is the amount of matter present in it while weight is the force exerted by gravity on an object The mass of a substance is constant whereas its weight may vary from one place to another due to change in gravity You should be careful in using these terms w my img The mass of a substance can be determined accurately in the laboratory by using an lic ve Fig

25 Which of the following statement is incorrect a Hydrogen is used to reduce NiO b Zirconium is refined by van Arkel method c The sulphide ore galena is concentrated by froth floatation d In the metallurgy of iron the flux used is SiO 2

Q 28 moderate O 4 1 00 17 Retractory materials are used for the construction of furnaces because they Are light in weight Can stand with high temperature O Are leak proof Do not require to be

NEET 201 56 Match items of Column I with the items of column II and assign the correct code A B C D Code A a iii b iv Column I Cyanide process Froth floatation process Electrolytic reduction Zone refining B iv iii i ii iii iv C v iii Column II Ultrapure Ge Dressing of ZnS Extraction of Al Extraction of Au Purification of Ni D i i

4 2 marks At 400 K the reaction 1 N g 3H g 2NH3 g has A G 11 92 kJ mol Starting with a mixture of 1 0 moles of N 3 0 mole

A For a certain reaction A function of A is given as below A M 0 1 t 2 min 100 Which of the following is are true C 0 025 50 The order is 2 2 The order is 1 products the t 2 as a B D 1 2 would be 100 10 min for A 1M would be 100

An organic compound dissociates into n parallel first order reactions simultaneously and produces P having n different products P P2 P3 Pn rate constants k 2k 3k nk and activation nE respectively energies E 2E 3E Calculate the overall energy of activation of the compound P A 2E 3 2n 1 C E 3 n 1 B E 3 2n 1 D E 3 n 2

Q 96 For the following reaction which description is correct 2XY 1 2X s Y g If XY is KCI then Ops A O Both the reactions can occur simultaneously in the electrochemical cell B C The forward non spontaneous reaction occurs in the electrolytic cell O The backward nor spontaneous reaction occurs in the electrochemical cell The forward non spontaneous reaction occurs in the electrochemical cell D

A Compound of formula Rn Si OH 4 n form linear and cyclic silicon respectively the value of n may be B 1 2 2 2 C 1 3 4 en 31 B Correct Answer U

O g 2e 0 g E 744 4 kJ mole The positive value of E is due to Question Type Single Correct Type 1 Energy is needed to add on 1 electron to O 2 Energy is needed to add on 1 electron to 0 1 3 Energy is released to add on 1 electron to 0 1 4 None of the above are correct

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm Which spectral line of H atom is suitable for this purpose R 1 x 105 cm h 6 6 x 10 34 Js c 3 108 ms JEE Main 2019 1 Balmer 2 3 Paschen 5 2 Lyman 1 4 Paschen 23

CIO d H F 2 dissociation 9 From separate solutions of sodium salts NaW NaX NaY and NaZ have pH 7 0 9 0 10 0 and 11 0 respectively When each solution was 0 1 M the strongest acid is 2 HX 4 HZ 1 HW 3 HY

21 An organic compound undergoes first order decomposition The time taken for its decomposition to 1 8 and 1 10 of its initial concentration are t1 8 and 11 10 respectively What is the value of 2 303 4 log t 4 log102 0 3 k 11 8 10 11 10