Physical Chemistry Questions

Decomposition of non volatile solute A into another non volatile solute B and C When dissolved in water follows first order kinetics as H O A s 2B s C s If initially 2 mol of A is dissolved in 360 g of H O and left for decomposition at constant temperature 25 C Then Ps in the given table is assuming A B and C are miscible in water S N 1 2 Time 12 hr 80 hr The vapour pressure of solution 20 mm Hg Ps Vapour pressure mm Hg of H O at 25 C is 24 mm Hg log 2 0 30

In XeF5 molecule the lone pair electrons of Xe occupies axial positions Inter molecular Hydrogen bonds are observed in the following The dipole moment of CH CI is greater than According to VBT bond angle in H O CH3F molecule is 90 C H OH HF CH NH

IS 2 52 The line at 434 nm in the Balmer series of the hydrogen spectrum corresponds to to th a transition of an electron from the n second Bohr orbit The value of n is

What is the heat of hydrogenation of ethene if the bond energies of C C C C H H and C H are 350 600 440 and 410 kJ mole respectively 1 130 kJ mol 3 400 kJ mol 2 260 kJ mol 4 450 kJ mol

12 mole C s reacts with 9 mole of O g to form CO g and CO g If no one reactant remains then calculate the density of final gas mixture in g L at temperature and 1 642 atm pressure R 0 0821 lit atm mole K

Q7 Calculate the velocity total energy and radius of an electron moving in the 4th orbit of Be Given velocity of an electron V 2 19 x 108 cm s Also mention two limitations of Bohr s atomic model 11 5

Uncertainty in position of a particle of 25 g in space is 10 5m Hence uncertainty in velocity ms is Planck s constant h 6 6 x 10 34 Js A 2 1 x 10 28 skipped B C D 2 1 x 10 34 0 5 x 10 34 5 0 x 10 24 Jy

a For the reaction Ag aq Cl aq AgCl s Given Species AG kJ mol 77 129 109 Wote the cell representation of above reaction and calculate E at 298 K Also find the solubilit product of AgCI cell 2 b If 6 539 x 10 g of metallic zinc is added to 100 ml saturated solution of AgCl Find th value of logo Zn Ag How many moles of Ag will be precipitated in the above reaction Given that Ag Ag E 0 80 Ag aq CI aq AgCl s

A mercury column of length 10 cm is in the middle of a horizontal tube of length 1 m closed at both ends containing same amount of a gas in both columns If the tube is placed vertically the mercury column will shift through a distance of 15 cm from its initial position Find the final pressure of gas in upper column in cm of Hg when the tube is placed vertically

0 1 molar aqueous solution of NaCl and water are separated by semi permeable membrane at 27 C If external pressure of 3 atm is applied on solution side then L atm mol K R 1 12 O O Osmosis will continue O Reverse osmosis will occur Osmosis will stop Solute will move from solution to solvent

In the 5th question option D is given to be incorrect Pls tell it s correct version Thank you very much 5 According to kinetic theory of gases A Collisions are always elastic B Heavier molecules transfer more momentum to the wall of the container C Only a small number of molecules have very high velocity D Between collisions the molecules move in straight lines with constant velocities IIT JEE 201

Match the enteries of column I with appropriate entries of column II and choose the correct option out of the four options A B C and D Column I Column II X Y Isobaric Z Adiabatic Isothermal P AT 0 q AV 0 r AP 0

5 Sketch the radial wavefunction the probability density and the probability distribution function of a 3d orbital At what radius will the probability distribution function reach its maximum value

the three correct options e g the first and fourth options without selecting any incorrect option second option in this case will result in 2 ma fourth option without selecting any incorrect option second option in this case will result in 1 marks Selecting any incorrect option s seconc result in 2 marks The following data are obtained in an experiment Solution 0 01 M HA 100 ml of 0 01 M HA 1 mmol NaOH Given Na 50 2 cm mol H 350 2 cm mol 1 Then select the correct statement Am NaA is 80 2 m mol 1 Am A is 30 1 cm mol 1 Am HA is 38 02 1 cm mol 1 Conductivity 3 8 x 10 5 0 1 cm 1 degree of dissociation of 0 01 M HA is 0 01 80 0 x 10 50 cm 1

The compounds XeF2 XeF4 and XeF6 are white solids that can be sublimed at room temperature The lower fluorides react with fluorine on heating under pressure making higher fluorides The fluorides are very strong oxidising and fluorinating agents They react quantitatively with hydrogen Read Less X 3 H O Y 6 HF X H O Z 2 HF If X is xenon hexafluoride then correct statement s is are Compound Y is XeO3 which is an explosive solid Both compounds Y and Z have same number of lone pair s on central atom Z is a partially hydrolyzed product of compound X X act as fluoride donor when it reacts with alkali metal flouride

Identify the properties of the gases produced in the following reactions Gas 1 evolves when iron reacts with sulphuric acid Gas 2 evolves when ferric carbonate reacts with sulphuric acid A Gasl Burns in air Crackling sound Gas 2 It doesn t burn in air B Gasl Burns in air No sound Gas2 Turns lime water milky C Gasl Turns lime water milky Gas 2 Burns in air Pop sound D Gasl It doesn t burn in air Gas 2 Crackling sound Q12 OPTIONS

In a hypothetical solid A atoms forming CCP lattice B atoms occupy all tetrahedral voids and C atoms occupy all octahedral voids If there is no distortion in CCP lattice then fraction of body diagonal covered up by atoms is

QNo 40 The conductivity of a saturated solution of CaF2 at 25 C is 6 x 106 Scm The conductivity of pure water is 2 x 10 Scm If A for Ca and Fions are 72 and 64 Scm mot then Kap of CaF is A C 4x 10 10 9 8 x 10 14 B D 3 2 x 10 14 D 9x10 10

A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0 25 ml of CO at T 298 15 K and p 1 bar If molar volume of CO2 is 25 0 L under such condition what is the percentage of sodium bicarbonate in each tablet Molar mass of Nah undat co 84 g mol 1 33 6 Services Limited JEE Main 2019 2 8 4 4 16 8

SolveLancer Test Millerite is an ore of Metal M Give the atomic number group number and valence electrons respectively for Metal M SolveLancer Test a 26 8 8 b 28 10 12 c 26 8 10 d 28 10 10

Consider the following reactions Reaction A B E 28 31 kJ Reaction 2 C D Ea 20 kJ If the initial temperature is 400 K for both reaction and the rate constants are equal then find the ratio of Arrhenius factor A A for reaction I and Z 12 18 O2 71 O 132 O 0 36

In the system 2SO2 0 2SO3 2 moles of SO 1 mole O and 2 moles SO3 are present at equilibrium What is the number of moles of O to be introduced into the vessel to increase the equilibrium moles of SO3 to 3 moles A 4 5 B 2 0 C 6 0 D 8 5

Consider the following statements regarding micelles 1 At critical micelle concentration several properties of the solution of surfactants such as molar conductivity surface tension and osmotic pressure undergo a dramatic change 2 Micelles from ionic surfactants can be formed only above a certain temperature called the Kraft temperature 3 The enthalpy of micelle formation in aqueous systems in slightly negative Which of the above state is are correct 1 alone 1 and 2 1 2 and 3 1 and 3

Basic reaction is that when metal reacts wit h acid it forms hydrogen and example was given that when metal copper reacts with ac id it forms hydrogen but this example is con tradicted in the explanation which given in t he solution of a question in the test questio n was that which reaction produces flamma ble gas One option was the reaction of Cop per and acid and other option was potassiu m and acid Option of reaction of Copper an d acid was told to be wrong polished off so i t has contradicted the video statement Plea

When two phases of the same single substance remain in equilibrium with one another at a constant P and T their molar must be equal Which of the following will fit into the blank O Internal energy O Enthalpy O Entropy Gibb s free energy

Question 29 Which of the following is a valid set of quantum numbers On 4 1 3 m 3 On 3 1 2 m 3 On 3 1 2 m 3 On 4 1 4 m 3

In which of the following entropy of the system decreases a Crystallization of liquid into solid b Temperature of crystalline solid is increased from 0 K to 115 K c H g 2H g d 2 NaHCO s Na CO s CO g H O g

8 According to Langmuir model of adsorption there is an equilibrium between adsorption and desorption as given below A g S s A S S where A S represent the adsorbate and the solid surface sites and A S is the adsorbed species The adsorption coefficient K is defined as kalka where ka and ka are the rate constants for adsorption and desorption respectively Which of the following is correct I K II K A S A S A S A S III A large value of K indicates strong adsorption IV A large value of K indicates strong desorption A I and III B II and III C I and IV D I and II

please explain the solution of this question i have read the solution given for this question it was give In that if we take more salts more fluid is retained in our b ody how is this related to high BP another answer said that osmotic pressure increases causi ng rupture of RBCs i dont understand how increase in os motic pressure would cause rupture of RBCs please explain clearly ouluun 1 mypotom o 41 Doctors advises patients of high blood pressure to take less quantity of common salt why Op

Osmotic pressure of an aqueous solution of a non electrolyte solute is 300 mm of Hg at 27 C If certain volume of this solution is diluted by adding water and temperature is raised to 54 C then its osmotic pressure is found to be 300 mm of Hg Find increase in volume of solution after dilution

Particle A is present at lattice points of FCC B is present at all octahedral voids C is present at all tetrahedral voids If U is number of particles of B in the nearest vicinity of B and V is number of particles of C in the nearest vicinity of C calculate U V 2

7 When a hydrogen sample in ground state i bombarded then what potential is required to accelerate electron so that first Paschen line i emitted 1 2 55 V 3 12 09 V 2 0 65 V 4 12 75 V

7 25 ml of the given HCI solution requires 30 mL of 0 1 sodium carbonate solution What is the of Aaka volume of this HCI solution required to titrate 30 mL of 0 2 M aqueous NaOH solution 1 25 mL 3 50 mL JEE Main 2019 2 12 5 mL 4 75 mL

If 100 ml of 1 M H SO4 solution is mixed with 100 ml of 9 8 w w H SO4 solution d 1 g ml then 1 Concentration of solution remains same 3 Mass of H S 04 in the solution is 98 g 4 Mass of H SO4 in the solution is 19 6 g

In how many of the following conditions for a spontaneous process X 2Y Z the activation energy of forward and reverse reactions are same AG 0 AS 0 AU 0 AG 0 AS 0 AU 0 DE AS 0 AU 0

as well D Write true or false 1 Accidents can occur anytime 2 We must follow safety rules to prevent accidents 3 We should keep our toys scattered in the room 4 If a person has some injury first aid should be given immediately 5 We should take medicines without consulting the doctor E Tick the rules which are safe

vii If the standard enthalpy of formation of methanol is 238 9 kJ mol then entropy change of the surroundings will be a 801 7 J K c 0 8017 J K b 801 7 J K 1 d 0 8017 J K

In an CCP crystal of metal M diameter a A we are trying to dope two smaller elements X radius 0 16a and or Y radius 0 25a without disturbing M M contact then select correct matching OBSERVATIONS 1 Density of crystal 2 increases on adding X Packing Fraction 3 remains same on adding X 4 Octahedral voids can have both X Y 1 2 Tetrahedral Void can t have either X or Y 1 REASONS 2 O Voids are bigger than T voids X atoms are heavier than M atoms and size of Unit cell remains same Dimensions of unit cell remain same rx M Question Type Single Correct Type 0 32 Radius ratio of ideal Tetrahedral void

For an equilibrium the equilibrium constants at 27 Cand 127 C are respectively K and K if AH for the reaction in the above temperature range is 4576cal then log10 K K is A 5 6 B 5 6 C D 4576 300 400 4576 10

e 1 NaCl structure II ZnS structure III CsCl structure IV CaF structure Il P OV Q P I P Q R S E U edge length of unit cell Distance between two nearest cations a Distance between two nearest cations 11 Distance between nearest cation and anion 4 11 Distance between nearest cation and anion NE lev Distance between two nearest anions 2 2 v3a 2 Distance between two nearest anions 3a Which of the following is correct combination of List and List II

Hydrolysis product of which of the following is used for blocking the polymeric chain of silicones MeSiCl 3 Me SiCl2

78 Which of the following statements is are correct for the following graph vapour pressure P mole fraction D Pg x 1 1 Minimum boiling azeotrope is formed at point D 2 Liquid A is more volatile than B 3 A and B form ideal solution at point D 4 Both 1 3 are correct 3 of 4 mc 82 H

50 ml of 0 2 M acetic acid is shaken with 10 g activated charcoal The concentration of acetic acid is reduced to 0 5 times the original molarity The amount of solute in g adsorbed per gram of the adsorbent is approximately

The solubility of MX MX2 and MX3 is 10 mole per litre Hence their solubility products are respectively O O O O 10 6 4 x 10 27 10 2 10 8 4 x 10 2 27 10 16 10 8 x 108 32 10 12 none of these

a A gas is compressed isothermally at 400K from 0 3Mpa to 4Mpa is then cooled isobarically to 290K After that it is expanded adiabatically to 0 9 Mpa Later expanded at constant temperature to the initial value of pressure Finally heated isobarically to 400K Draw the PV diagram and calculate the overall work done change in internal energy and heat supplied Data Cp 3 7R and Cv 2 7R

ii A gas is allowed to expand in a well insulated container against a constant external pressure of 2 5 bar from an initial volume of 2 5 L to a final volume of 4 5 L The change in internal energy AU of the gas will be

Consider the following redox reaction H O AX BY HA YO BX2 unbalanced It is also known that oxidation number of X is 2 and neither X nor water is involved in the redox process In compound BY B is cation and consider its oxidation number 4 Select the incorrect option O The element A is undergoing reduction The element B is undergoing reduction The element B is undergoing oxidation The element Y is undergoing oxidation

26 The mass of molecule AB is four times the mass of molecule AC The rms velocity of AB is three times the rms velocity of AC The ratio of pressure exerted by AB AC in two containers of equal volume and at the same temperature is 2 12 1 4 36 1 1 1 12 3 1 36

Which of the following is correct A In X ray photoelectron spectroscopy valence electrons are ejected B K E of photoelectrons increase when the intensity of the incident X rays is increased C K E of photoelectrons decrease when the oxidation state of the surface is increased D Number of photoelectrons emitted increases with frequency of the incident X rays

A colourless salt when treated with con H SO4 evolve a colourless gas with strong odour which gives white dense fumes with glass rod dipped ammonia The anion of the salt can be A CO B CI C SO D NO 3