Physical Chemistry Questions

The value of AH transition of C graphite C diamond is 1 9 kJ mol at 25 C Entrop of graphite is higher than entropy of diamond This implies that A C diamond is more thermodynamically stable than C graphite at 25 C B C graphite is more thermodynamically stable than C diamond at 25 C C diamond will provide more heat on complete combustion at 25 C DAG of C diamond C graphite is ve

3 K Fe CN C13 4 K Fe CN Which of the following option is correct 1 Ce solution are widely used as oxidizing agent in volumetric analysis 2 Ce is diamagnetic ion while Yb is paramagnetic ion 3 All the lanthanides are much more reactive than aluminium 4 Both 2 and 3 are correct 3 K Fe CN C1 4 K Fe CN 49 faffefaccy 1 fad C face f 2 Cafe Y 34 32 1 3 2153 fafen af den streife fefe 4 2 3

3 ii only 4 i only The relative lowering of vapour pressure of an 56 aqueous solution containing non volatile solute is 0 025 The molality of the solution is 1 0 7 2 1 42 3 0 5 4 0 8 ENLL QU g 3 het ii 4 i Ven Sanviter facta ter and veta farza i ar fer FPT 0 025 Bar fara a FLEGE 1 0 7 2 1 42 Nunta fr 3 0 5 4 0 8

Iron crystallizes in BCC structure with a 68 unit cell length of 360 pm The radius of iron atom is 1 127 pm 3 156 pm 2 140 pm 4 165 pm 1 17 2 20 3 18 4 19 STRIEBCC FEAT faca santafe if you 360 pm at from 1 127 pm 3 156 pm 2 140 pm 4 165 pm

Which one of the following solutions will exhibit 65 highest boiling point 1 0 05 M glucose 2 0 01 M KNO 50 3 0 015 M Urea 4 0 01 M Na SO 75 siast Leader Achiever ALL PHASE fac 1 0 05 M 2 0 01 M KNO 50 3 0 015 Ma 4 0 01 M Na SO a 75

An alloy of Cu Ag and Au is found to have copper constituting the ccp lattice If silver atoms occupy the edge centre and gold is present at body centre the alloy has a formula A Cu4Ag2Au C Cu4Ag3Au B Cu4Ag4Au D CuAgAu

If the rate constant of the reaction X Y is 4 x 10 4 mol L 1 s1 and initial concentration of X is 2 4 M then the concentration of Y after 40 minutes will be OPTIONS MARK FOR REVIEW CLEAR SELECTION A 1 49 M OB 0 48 M OC 1 24 M OD 0 96 M 4x10 4 mol L 1s 2 4 M40

ALLEN The standard emf of a cell involving two 61 electron change is found to be 0 591 V at 25 C The equilibrium constant of the reaction is F 96500 C mol R 8 314 JK mol 1 1 1020 2 1 10 3 1 1030 4 1 10 5 The molar solubility of a sparingly soluble salt in 162 var for seg i 25 591 frenian F 96500 C mol R 8 314 JK mol 1 1 1020 3 1 10 erufaru a 2 1 10 0 4 1 10 few framan s

d 0 008 If all the lattice points of an FCC structure are occupied by uniform hard spheres that touch each other the fraction of volume occupied is a T 2 6 b T 3 6 c IT 6 d 2

In which of the following transition maximum energy radiation will be emitted for He ion estion Type Single Correct Type 1 2 3 4 n 5 to n 2 n 3 to n 1 n 7 to n 3 n 8 to n 4

9 A partially dried clay mineral contains 8 water The original sample contained 12 water and 4 5 silica The of silica in the partially dried sample is nearly 1 50 2 49 3 55 4 470

AL For the reaction 2N O g 4NO g O g If 50 the concentration of O increases by 2 10 M in 100 seconds then the rate of disappearance of N O is 1 4 x 10 Ms 3 4 10 Ms 2 1 x 10 Ms 4 2 10 Ms ff 2N O g af 100 sec 0 Brat N O faciat 1 4 x 10 Ms 3 4 10 Ms 4NO g O g fer 210 M 2 1 10 Ms 4 2 10 Ms

4 2 53 10 H atoms The density of a gas is 0 714 g dm at 273 K 59 and 76 cm of Hg The gas is 1 CH 3 CO 2 C H 4 Xe t Leader Achiever Course ALL PHASE 50 4 2 53 x 10 H atoms 273 K 76 cm Hg 0 714 g dmt at het 1 CH 3 CO 2 C H 1 Xe 1001CMD363119111

ALLEN 2 For the reaction 2NO F 2NO F following 82 mechanism has been provided slow NO F NO F F NO F NO F fast Thus rate expression of the above reaction can be written as 1 r K NO F 2 r K NO 31 2NO F farifafa NO F NO F NO F F NO F 2NO F faz 1 r K NO F 2 r K NO 3 r K NO F 3 r K NO F 4 r K F 4 r K F 3 A given mass of gas expands reversibly from the state 83 ffa eft fafted cour da

The Henry s law constant for the solubility of N gas in water at 298 K is 1 0 x 10 atm The mole fraction of N in air is 0 8 The number of moles of N from air dissolved in 10 moles of water at 298 K and 5 atm pressure is a 4 0 104 c 5 0 104 b 4 0 10 5 d 4 0 10 6

3 In the reaction of 0 220 g lithium with 200 g HCI solution which is in excess the temperature of the solution increases by 10 5 C Assume a heat capacity of 4 18 J g C and 200 0 g of solution Calculate the AH in kJ

In first order decomposition of H O2 it takes 5 minutes for the evolution of 25 mL oxygen gas The reaction ends with the evolution of 100 mL oxygen gas The rate constant of decomposition of H O2 is a 0 277 b 0 727 c 0 772 d 0 693

Choose the correct alternative A trader defrauds both his supplier and customer using a faulty weighing machine He takes 20 more than the indicated quantity while buying from the supplier While selling the customer he gives the customer a weight such that if the weight given to the customer is increased by 10 then the weight claimed by the trader is obtained Find his pro percentage Assume that he sells the product at the cost price O 30 33 33 O 32 O Cannot be determined

Purpose What was the purpose s of this experiment Use your own words DO NOT just copy the objectives goals from the lab document Evaluate the data What were the major results Were the results bad mediocre good or excellent Explain Your results should include the identity of your unknown Good results mean that you was able to use the tests to easily identify your unknown Make sure you briefly explain how you were able to identify

4 5 3 For given transitions order of wavelength of 49 feug vi for free trained a photon emitted will be A 6 4 C 3 1 1 AAA 2 Ac Ap A 3 B 4 2 D 2 1 A 6 4 C 3 1 1 A An A A 2 A Ap A A B 4 2 D 2 1

O At particular concentration the half life of the reaction is 100 minutes When the concentration of the reactant become double half life becomes 25 minutes then what will be the order of the reaction 1 1 3 O 2 2 4 3

Which of the following sets of quantum number is not possible Question Type Single Correct Type 1 2 3 4 n 3 l 2 m 0 ms 1 2 n 3 l 0 m 0 ms 1 2 n 3 l 0 m 1 m 1 2 n 3 l 1 m 0 ms 1 2 Your Answer Status Incorrect

1 4 2 16 3 Which of the following are not a constant value 55 fth f ax for face between two given thermodynamic states of a omfafine seat given system 0 q iii U PV 1 i and iv 2 iii and iv 3 ii only 4 i only The relative lowering of vapour pressure of an 56 ii q w iv H TS 1 q iii U PV D q w iv HI TS 4 4 face from 1 i iv 3 ret ii an averafter fad re and safa farzan 2 i iv

On Fig 4 1 draw another ray from point A to locate the image of point A Label this image 1 d On the ray diagram in Fig 4 1 the refraction is shown occurring at the centre line of the lens State where the refraction actually occurs

3 A B 4 A B A diatomic gas belonging to group 15 combines 61 with a halogen to form a trihalide which is fairly stable and inert The trihalide is 1 NCI 3 BiF 2 PCI 4 NF A703 2 AB 4 A B 3 A B 4 van faccentuare the furat t at an af starts a rents t 1 NCI 3 BiF 2 PCI 4 NF

A ground state H atom absorbs a photon with a frequency equal to 3 20 x 1015 sec The atom then emits two photons one at a time two successive jumps one of wavelength 2626nm to reach an intermediate level and a second to reach the ground state a What higher level n did the electron reach b What intermediate level n did the electron reach c What was the wavelength of the second photon emitted

The Gibbs energy for the decomposition of Al2O3 at 500 C is as follows 2 4 Al2O3 Al O ArG 960 kJ mol 1 The potential difference needed for the electrolytic reduction of aluminium oxide Al2O3 at 500 C is at least Question Type Single Correct Type 1 2 5 V

Given 8 Kl aq 5H SO4 aq 4K SO4 aq 412 g H S g 4H O g 16 mol of KI reacts with 12 mol of H SO4 The total volume of gases collected at latm and 546 K is A B c D 18 x 22 4 Litre 14 x 22 4 Litre 10 x 22 4 Litre 36 x 22 4 Litre

1 12 4 2 13 3 3 11 4 4 12 95 How many hydrogen atoms are present 58 in 0 35 moles of C6H12O6 Given N 6 023 10 X 1 2 53 10 H atoms 2 2 53 102 H atoms 3 2 53 x 10 H atoms 4 2 53 10 H atoms 1 12 4 3 11 4 0 35 C H O Juftera 2 f N 6 023 10 1 2 53 10 H atoms 2 2 53 10 H atoms 3 2 53 10 H atoms 4 2 53 10 H atoms 2 13 3 4 12 95 far

In IR spectroscopy the fingerprint region extends from ans 1250 800 cm 1250 500 cm 1 1350 1000 cm 1500 600 cm

The initial rate of the reaction between A and B was measured and the results are tabulated below Experiment 1 2 3 A B C A M 0 20 0 40 0 40 a b c Write the overall rate law d e B M 0 10 0 10 0 40 Calculate the order of each reactant Determine the overall order of reaction Initial rate Ms 3 50x 10 3 7 00x 10 3 7 00x 10 Calculate the rate constant k based on experiment 1 data State the unit for k 4 1 1 2 1

When we fill Hidrogen in the balloon it will fly and why gravity does not work o n it we know that Hidrogen is lighter tha n other air but the balloon as mass why gravity does not work on the balloon m ass

1 0 7 2 1 42 3 0 5 4 0 8 The pH value of decinormal solution of NH OH 57 which is 25 ionised is 1 12 4 3 11 4 2 13 3 4 12 95 1 0 7 NH OH 1 12 4 3 11 4 2 1 42 3 0 5 ma faca fa 2 13 3 4 12 95 4 0 8 25 3

Given that 1 3 m Fe 68 ohm 1 cm mol 1 and 1 2 m SO2 80 ohm 1 cm mol 1 What will be Fe2 SO4 3 Question Type Single Correct Type 1 2 148 ohm1 cm eq 1 880 ohm cm eq

A photon of 300 nm is absorbed by a gas and then emits two photons one photo has a wavelength 496 nm then the wavelength of second photon in nm is Question Type Single Correct Type 1 959 2 859 3 759

In a solid oxide ions are arranged in CCP one sixth of the tetrahedral voids are occupied by A cations and one third of the octahedral voids are occupied by B cations The formula of solid is Question Type Single Correct Type 1 2 3 ABO ABO2 ABO3

For an exothermic chemical process occurring in two steps as follows i A B X slow ii X AB fast The process of reaction can be best describe by Question Type Single Correct Type 1 2 P E A B reaction coordinate R C P E A B P E R C n AB AB

A phosphate group in DNA is linked with 3 carbon and 5 carbon of two different deoxyribose sugar 3 carbon of two different deoxyribose sugar 5 carbon of a deoxyribose sugar and 7 carbon of a purine base 3 carbon of a deoxyribose sugar and 5 carbon of ribose sugar

The molar concentration of chloride ion in a solution made by adding 300 ml of 3 0 M KCI solution to a 200 ml of 4 0 M BaCl2 solution will be Question Type Single Correct Type 1 2 3 5 0 M 1 8 M 1 6 M

2 2 Langmuir adsorption isotherm for the dissociative adsorption of D p partial pressure of D and k ratio of rate constants for adsorption and desorption is a 0 kp 1 kp b 0 k 1 kp c 0 kp 2 1 kp 2 d 0 1 2 P 1 kp s

How many grams of sucrose Molar mass 342 should be dissolved in 100 g water in order to produce a solution with a 105 0 C difference between the freezing point and the boiling temperatures Kf 1 86 C m Kp 0 51 C m YOU A 34 2 g B 72 g c 342 g D 460 a

The theoretical density of ZnS is d g cm If the crystal has 4 frenkel defect then the actual density of ZnS should be uestion Type Single Correct Type 10 96 d g cm 2 3 4 1 04 d g cm d g cm da cm

Please explain why in this question kinetic energy and pot ential energy will not be conserved A shell in flight explodes into four unequal parts Which of the following is conserved 1 Potential energy 2 Momentum 3 Kinetic energy 4 Both 1 3

10 ml of a sample of H O solution liberates 112 ml of O gas at STP upon decomposition Identify the correct statement s A Normality of the above sample of H O2 is 0 5 N B 15 ml of the same H O solution liberates 224 ml of O gas at 1 5 atm and 273 C C DI Milliequivalents of hypo required for the titration of liberated I when 10 ml of the same sample of H O solution is treated with excess of acidified solution of KI are 20 06 Gil of of Ha in 21 06

Experiment 1 A mixture of water and AgCl s is shaken until a saturated solution is obtained Now the solution is filtered and to 100 ml of the clear filterate 100 ml of 0 003 M NaBr is added Experiment 2 A mixture of water and AgBr s is shaken until a saturated solution is obtained Now the solution is filtered and to 100 ml of the clear filterate 100 ml of 0 003 M NaCl is added Given Kp AgCl 10 10 and Kap AgBr 10 4 at 25 C precipitation would happen in B Experiment 2 D Neither experiments A Experiment 1 C Both experiments

4 1 2 3 4 Following diagrams explain which Properties of metals Beating iron nail with hammer Complete the following table 1 5 6 7 8 AUTUI VIG Wood Rubber Pencil lead Salt solution Which gas burns with a pop sound a c Hydrogen Oxygen Nature of metal oxide is a Basic c Neutral b d The property of metals due to which they can drawn into wires a Conductance b Sonorous c Ductility d Malleability b d Property Passing electricity through any Material Appearance Conduction of heat Malleability Ductility r Insulator Nitrogen Carbondioxide Non metal solution of which is used as an antiseptic on wounds a Potassium Dichromate Potassium permanganate b c Sodium chloride d Copper Sulphate Acidic None of these letal 1 of 2 Name the following type of reaction Copper sulphate CuSo Zinc Zn Zinc Sulphate Znso Cu Copper Displacement addition Write any three differences between metals and non metals on the basis of fol lowing characters Non Metal

Reaction between A and B is carried out for different initial concentrations and the corresp half life times are measured The data listed in the table Entry 40 M Blo UM 1 2 sec 1 500 60 2 60 3 60 4 30 500 10 20 10 20 500 500 The rate can be represented as a k A B b k A c k A B d k A B

If a stands for the edge length of the body 50 fe fa centred cubic simple cubic and face centred cubic systems than the ratio of radii of the spheres in these system will be respectively 3 1 a 2 a a Va 3 3a la a 4 3a a 3 1 1 a 2 a a a 3 3a 1a a 4 3a a a

On average through respiration a human body exhales 1056 gm of CO per day If this CO is allowed to expand under 273K temp and 1 atm pressure then what is the volume occupied by it

AgCl is crystallized from molten AgCl containing a little CdC12 The solid obtained will have cationic vacancies equal to number of Cd ions incorporated cationic vacancies equal to double the number of Cd ions O anionic vacancies neither cationic nor anionic vacancies