Physical Chemistry Questions

71 180 Mark for Review In the reaction 2 C2H6 g 7 O2 g 4 CO2 g 6 H2O I When 1 mole of C H6 and 5 mole of O are made to read completion 3 mole of CO2 will be produced 4 mole of H O will be produced 2 mole of O2 will be consumed All the ethane will be consumed

A metal M forms the sulphate M SO4 3 A 0 596 gram sample of the sulphate reacts with excess BaCl to give 1 220 g BaSO4 What is the atomic weight of M Atomic weights S 32 Ba 137 3 1 26 9 2 69 7 3 55 8 4 23

4 20 min 45 If A B C 0 and A B C 0 then angle between 45 a 2 has 4 A and B A 6 2 0 P 1 cos 3 sin 1 A B 2024 A B 2 cos B 1 1 4 sin A B 1 0 B A

The following two reactions of HNO with Zn are given as equations are not balanced Zn conc HNOs Zn dil HNO3 Zn NO3 Y H O B In reactions A and B the compounds X and Y respectively are Zn NO3 X H O A ONO2 and NO O O O NO2 and NO2 NO and NO2 NO and N O

66 Choose the incorrect statement 1 Number of formula units in rocksalt structure is 4 2 Number of formula units in CsCl structure is 1 3 Number of formula units in sphalerite is 2 4 Co ordination number of fluoride ion in fluorite type structure is 4

In a Cubic lattice A atoms occupy all corners B atoms occupy all face centers except one position and C atoms occupy the alternate edge centers The simplest formula will be 1 A3B5C2 3 A B C3 2 A B5C 4 AB3C

Identify the CORRECT statement below about the diaphragm process O a The cathode is made of steel O b Both compartments have caustic soda flowing into them OC It is very costly regarding to electricity consumption Od Chlorine is produced at the cathode

What would be the entropy change involved in 86 25 C 234 235 thermodynamic expansion of 2 moles of gas from a volume of 2 L to a volume of 20 L at 25 C Given R 8 3 J mole K 1 38 23 J K 2 26 76 J K 3 20 J K 4 28 23 J K 3 wor mcort R 8 35 m 1 na he afe fea R 8 3 J mole K 1 38 23 J K 2 26 76 J K 3 20 J K 4 28 23 J K

In a first order reaction the concentration of the reactant is decreased from 1 0 M to 0 25 M in 20 minute The rate constant of the reaction would be O O 00 19 10 min 6 931 min

F is produced by the given unbalanced equation How many grams of F is produced if 1 024 mol of SbF5 is reacted K MnF6 SbF5 KSbF6 MnF3 F Your answer O 19 5 g O29 3 g 38 9 g O 9 73 g

The incorrect assumption regarding the Langmuir adsorption isotherm of a gas on solid surface is The adsorption sites are equivalent in their ability to adsorb the particles It is unimolecular layer in nature It involves two opposite processes i e condensation of gas molecules and evaporation of these molecules The rate of condensation of a gas is independent to the unoccupied surface adsorbent

55 The maximum and minimum number of electrons in Co having 2 s 1 1 2 1 7 0 2 2 5 5 2 Can t be determined e P F of an electr in its ground state will be C 3 4 4 2 1 2 read and sear 1 1 2 55 12 s 1 7 0 2 2 5 3 5 2 4 Hand

430 36 4 57 56 48 The potential energy of an electron in Het is 6 8 eV The 48 Het 3 6 8 V13E electron is present in which excited state 1 1st 2 2nd 4 3rd 68207 6 880 3 4th 3and a proton are accelerated by the same potential n en Libe 1 1st 3 4th B 1 2 2nd 4 3rd

59 Which of the following set of quantum numbers represents 59 f 24 tielle fall v the highest energy of an atom 1 n 3 1 0 m 0 s 2 2 n 3 1 1 m 1 s 1 3 n 3 1 2 m 1 s 2 1 1 4 n 4 1 0 m 0 s 2 1 1 1 213 1 n 3 1 0 m 0 s 1 2 n 3 1 1 m 1 s 2 1 3 n 3 1 2 m 1 s 2 1 4 n 4 1 0 m 0 s

ne 64 x ch 2 Sovent VISON Manna 1 x P x P 0 P P P 9 x 1 Following conclusions can be drawn from equation 2 16 Total vapour pressure over the solution can be related to the r fraction of any one component ft PT P P ii Total vapour pressure over the solution varies linearly with th mole fraction of component 2 By Jaur SOVENT SOTOTE ALO Mole fraction III IF Sater x 0 P 2 1 iii Depending on the vapour pressure of the pure components I and total vapour pressure over solution decreases or increases with the increase of the mole fraction component 1 A plot of p or p versus the mole fractions x and x for a solution gives a linear plot as shown in Fig 2 3 These lines I and II pass through the points for which x and x are equal to unity Similarly the plot line III of Ptotal versus CORRECTION Moles of Moles of Total n XCH CL XCHCH Usin ii U f 2021 06 2100

1 Specific conductance of saturated solution of AgCl is 2 68x104 Sm and that of water is 0 86 10 Sm at 298 K Calculate the solubility product in mol dm unit if m for HNO3 AgNO3 and HCI are 421 104 Sm mol 133x10 4 Sm mol 426x104 Sm mol respectively A 1 74x10 10 C 1 32 10 B 1 32x10 5 D 1 74x104

66 Forl2 2e 21 standard reduction potential 0 54 volt For 2Br Br2 2e oxidation oxidation potential 0 44 volt Which of the following potential 1 09 volt For Fe Fe 2e standard reactions is non spontaneous a Br 212Br 12 b Fe Br2 c Fe 12 2 2 2Br Fe Fe 21 Fe2 Br 21 Br standard 2 72 A

0 25 molal aqueous solution of a mono nuclear complex containing potassium cobalt d cyanide ion is prepared for cryoscopic experiment Freezing point of the above lution was found to be 1 86 c Magnetic moment measurement revealed that spin ly magnetic moment is zero vapour pressure of the same solution at 25 c if vapour essure of pure water at 25 cis 23 8 mm of Hg is mm

0 NaCl forms an ionic crystal in which CI ions form C C P lattice The number of Na ions present at 5 A a distance of from CI ion at the corner is 2 Here A is the edge length of crystal 24

Which of the following statements is are correct At constant volume there will be no effect of changing T or P on mean free path Collision number increases on increasing temperature at constant volume If diffusion coefficient is proportional to mean free path and mean speed then on increasing absolute temperature of an ideal gas by four times and pre by two times diffusion coefficient of gas increases four times According to kinetic theory of gases between two successive colloisions a gas molecule travels in straight line path

Class XIII Spartan 56 For a second order reaction 2A products a plot of log 56 fife 34ff41 24 32414 an fet P t 2 vs log 1 a where a is initial concentration will give an intercept equal to which one of the following 3 log 1 a a 9 A 1 2 Joogl For the reaction 2 log 2k 4 log k 2A B3LD XY CE Bely StR Rexh 4 11 2 1 2 log 2k Log 41 12 log 2 love 4 log k 57 ffu fu

ideal gas subjected to expansion against 1 mole of monoatomic irreversible adiabatic constant external pressure of 1 atm starting from initial pressure of 5 atm and initial temperature of 300 K till the final pressure is 2 atm What is the magnitude of work done in cal in the process take R 2 cal mol K

One mole each of two ideal gases are allowed to mix isothermally at 300 K and at a constant total pressure If the mixture also behaves like an ideal gas then the change in Helmholtz free energy AmbA in J of the process is a 3458 O b 1729 Oc 1729 O d 3458

Which of the following relation is correct regarding reversible adiabatic process T V T V P V PfVf T V 1 T V 1 P V P V hr

4 2p q 5t 8s 4t 67 Enthalpy of formation of NH is X KJ and ABD HH HAB D HN are respectively Y kJ mol and Z kJ mol The value of is H AB D NEN DB D 1 Y 6Z N t3 Jenis 2 3Y 6Z 2X 3 3Y 6Z X 4 Y 6X Z X 3 3 4p 2q 5r 8s 4t 4 2p q 5t 8s 4t 67 NH XKJ ABD HHAB D HN H Y kJ mol 72IT Z kJ molla A D HN i HTC N N 1 Y 6Z X 3 3 3Y 6Z X 2 3Y 6Z 2X 4 Y 6X Z sh

Q2 Consider the titration of 30 0 mL of 0 015 0 M MnSO4 with 0 0100 M EDTA in a solution buffered to pH 8 00 Calculate pMn at the following volumes of added EDTA and sketch the titration curve a 0 0 mL b 15 0 mL c 30 0 mL d 45 0 mL e 60 0 mL f 75 0 ml

The total pressure exerted by an ideal binary mixture of A and B is Given P 40 mm Hg P 80 mm Hg and mole fraction of A in vapour phase is 120 mm Hg 60 mm Hg 200 3 160 3 mm Hg mm Hg

For the ideal gas find the missing parameter in each part among P V T and n i P 0 8314 Pa V 6000 m T 300 K ii P 5 atm V 8 21 L T 200 K iii P 831 4 Pa V 5000 L T 250 K iv V 8 21 L T 500 K n 10 3 v V 100 m T 300 K n 3 vi P 831 4 Pa V 1000 L n 0 1 vii P 22 4 atm T 273 K 3 viii V 45 4 m T 2730 K TITUT n 5

reac 1 AH 0 and AS 0 2 AH 0 and 4S 0 3 AH 0 and AS 0 4 AH 0 and AS 0 65 Which statment is correct 3 dH dT dH dE dV dE dE R for ideal gas is zero 4 All of these The enthalpy of reaction 65 2 AH 0 FT AS 0 3 AH 0 72 AS 0 4 AH 0 AS 0 1 dH 3 4 66 3f4f41 dE dE dT V g R dE dV T

66 The enthalpy of reaction 2HC CH 50 4CO 2H O If the bond energies of C H C C O 0 C 0 and 0 H bonda are p q r s and t respectively 1 8s 4t 4p q 5r 2 4p 2q 5r 8s 4t 3 4p 2q 5r 8s 4t 4 2p q 5t 8s 4t 7 Enthalpy of formation of NH is XKJ and H H 66 3 67 2HC CH 50 4CO 2H O CH C C O OCO 1 8s 4t 4p q 5r 2 4p 2q 5r 8s 4t 3 4p 2q 5r 8s 4t 4 2p q 5t 8s 4t NH G

The elevation in boiling point of a solution of 20 g of a 52 un facta 20g fait face fay del binary electrolyte molecular mass 150 in 200 g of water HIGH GA 150 200 g is A T The value of K for water is 1 347b 4 4AT 3 2 ATB 3 4Tb 2 4 44Tb Thou 23 lot x 5 X 15x200 L dia BAT 4 K 2 4AT 3 AT 4 AT Class XIII Sparta RT OTb kb ko

Select the incorrect statement from the following options Natural cement possesses hydraulic qualities O Cement can be defined as inorganic material having adhesive and cohesive properties a b C O Cement is obtained by burning calcareous and argillaceous materials d Natural cement can be obtained by burning clay rich with ipsum

4 2 If 0 50 L of a 0 60 M SnSO solution is electrolyzed for a period of 30 0 min using a current of 4 60 A If inert electrodes are used what is the fina concentration of Sn2 remaining in the solution at wt of Sn 119 1 0 342 M 3 0 389 M 2 9 6 M 4 0 514 M

Spartan Batch PCB 1 68 The heat of neutralisation for strong acid strong base 68 2 3 ETA ARIFIER forming 2 moles of water is 1 2 57 1 kJ 2 57 1 kJ 57 1 3 kJ 2 4 Strong acid and strong base will not undergo neutralisation 34 1 2 57 1 kJ 2 57 1 kJ 57 1 2 1 3 4 GRAFICZY I MI kJ

Which of the following is not a colligative property Vapour pressure Osmotic pressure Depression in freezing point Elevation in boiling point hr

3 K E 3 4 eV 3 3 4 eV n 4 4 None of these 4 T 57 A 2 kW radio transmitter operates at a frequency of 400 57 2 kW Hz How many photons per second does it emit 1 1 71 x 1021 2 1 88 1033 3 6 02 x 1023 4 7 55 1033 n 4 R Mhu 1 1 71 x 1021 2 1 88 x 1033 3 6 02 x 1023 4 7 55 x 1033 400 Hz for at 2x103 6 626x104 X

Consider a mixture of air and gasoline vapour in a cylinder with a piston The original volume is 40 cm If combustion of this mixture releases 950J of energy to what volume will the gas in L expands against a constant pressure of 5 bar if all the energy of combustion is converted into work to push back piston monostomic

85 Which of the following is in order of increasing covalent 85 character 1 CCl4 BeCl BCl3 LICI 2 LICI CCI4 BeCl BCla 3 LICI BeCl BCl3 CCl4 4 LICI BeCl CCl4 BC13 j J

How many a 58 grams NaCl contain more Cl atoms than 0 4 mol Cl b The energy lost by an electron that moves from the sixth to the second orbit in a Hatom is 4 84x10 1 c When an electron moves from the third to the second orbit in the H atoms it emits a red photon d In a photo absorption process the electron loses energy e The line spectra produced by atoms cannot be used to analyze unknown substances t if an electron that is located in n 2 in Habsorbs 4 497x10 19 J will end up in the n 4 energy level O 5 statements 4 statements 3 statements 2 statements Ostatements

neet prep Chemical kinetics Contact M 1 A hydrogenation reaction is carried out at 500 K If the same reaction is carried out in the presence of a catalyst at the same rate with same frequency factor the temperature required is 400 K What is the activation energy of the reaction if the catalyst lowers the activation energy barrier by 16 kJ mol 1 100 kJ mol 2 80 kJ mol 4 For first respectiv formation joule mol will be ob

0 34 63 Silver is removed electrolytically from 200 mL of a d 0 76 0 34 1 10 V ampere 0 1 N solution of AgNO3 by a current of 0 1 How long will it take to remove half of the silver from the solution b 16 sec a 10 sec d 9650 sec c 100 sec ions the mass of Al The atomic mass of Al is 27 When a current of 5 faraday 3 tion of Al

88 Heat of formation of ethane is energies of H H C H and C C bonds are 104 18 99 and 80 kcal Than calculate heat of atomisation of graphite 1 171 kcal Ang 19 4 2 273 kcal 3 71 kcal 4 90 kcal 19 46 kcal and bond 88 19 46 kcal a H H C He The arbital J HINDI04 18 19 41 104 18 2 5 at 1 171 kcal 2 273 kcal 3 71 kcal 4 90 kcal 104 18 99 80 kcal a

Rate of appearance of D 58 The polential energy diagram for a reaction AB is 58 given below Energy A 1 x y 2 y z 3 x Z 4 W 7 Z X Biw R C The threshold energy of the reaction is

The correct order of solubility of He CO and O in water at 298 K and 1 atm is He 0 CO2 02 CO He CO O He CO He 0

When an electrolyte associates in solution then van t Hof factor i is Greater than one Less than one Equal to one hr m Zero

Following figure shows an FCC unit cell with atoms of radius r marked 1 corner 2 face center 3 face center A quadrilateral is also shown by joining the centers of 4 face centered atoms The distances between atoms 1 2 2 3 and 1 3 A 2r 2r 2 3r C r 2r 2 3r 3 2 B 2 3r 2r r D r 2r 3r

32 A mixture of 2 3 g formic acid and 4 5 g oxalic acid is treated with conc H SO4 The evolved gaseous mixture is passed through KOH pellets Weight in g of the remaining product at STP will be 1 1 4 2 3 0 3 2 8 4 4 4

107 g of a ammonium chloride sample decomposes on heating to give HCI g and 25 5 g of NH3 g The percentag purity of ammonium chloride sample is 81 78 95 21 75

Br 2 4 N N NH neet prep Organic chemistry Differentiation and conversion 18th October Contact Number 9667591930 8527521718 NHOH Zn NH C Consider the following reaction ethanol PBr alc KOH i H SO room temperature ii H O heat X Y the product Z is 1 CH CH 2 CH3CH O CH CH3 3 CH3 CH O SO3H 4 CH CH OH 11 Page 1 2 methyl 2 butene 2 3 methyl 1 butene Z Which of the compounds with molecular formula C H10 yields acetone on ozonolysis

AP min 1 0 0 5 0 25 me min 1 min 3 0 1 0 2 0 me min 1 of NOBR at Br at 27 C approx 40 Consider the reaction Reaction l P Q Reaction II Y Z First order reaction Rate constant K Activation energy X First order reaction Rate constant K Activation energy X Both reactions occur in different container In reaction l rate constant becomes 10 times to initial rate constant when temperature increases T to 3T while in reaction II rate constant becomes 10 times to initial rate constant when temperature increases T to 2T The correct statements is given x and x both are positive value and temperature independent T 300 K and value of Arrhenius parameter A of both reactions is same 1 X X 2 X X 3 If initially P Y 1 M at 300 K then rate of 1st reaction PQ is more than 2nd reaction Y Z 1 Roth 1 8 2 43 F