Physical Chemistry Questions

At 298 K the emf of the cell standard hydrogen electrode second half cell constructed by taking standard hydrogen electrode as anode reference half cell and the other half cell as cathode gives the reduction potential of the other half cell If the concentrations of the oxidised and the reduced forms of the species in the right hand half cell are unity then the cell potential is equal to standard electrode potential ER of the given half cell E ER EL

Calculate the number average molecular weight for an adipoyl chloride and 4 4 methylenedianiline system a Equimolar mixture when p 0 98 b Equimolar mixture when p 0 999 c r 0 98 and pa 0 995 d r 0 995 and p e Name the polymer formed 0 98

Suppose we have the following chemical reactions B X 2X occurs at rate k1 X Y 2Y occurs at rate k2 Y D occurs at rate k3 where B is a constant reactant and the production of X is density dependent carrying capacity C What is the system of ODEs that describes these reactions

SolveLancer Test Fe O3 on reaction with HCI gives FeCl and water If 20 g of Fe O3 reacts with 50 g of HCI then amount of unreacted HCI will be SolveLancer Test a 28 5g b 22 6gRX 5609 c 50g d None of the above

Solvelancer Test The formation of Q and R takes place according to given equations The enthalpies of reaction are also given as P Q AH 180 kcal Q R AH 120 kcal The correct order of enthalpies of formation for P Q and Ris Solvelancer Test a P Q R b P R Q c R P Q d Q R P

Ilts IN d n 4 c n 4 1 0 m 1 m 2 164 The subshell that arises after f is called the subshell How many electrons may occupy the g subshell a 9 b 7 c 5 d 18 65 Which of the following electron configurations is correct for iron atomic number 26

174 The Schrodinger wave equation for hydrogen atom is 3 2 1 1 4 25 ao 4 2 o where ao is Bohr s radius If the radial node in 2s be at ro then ro would be equ ao d ao b 2a0 c 2 ao a 2 Je r ao

Consider the following reaction OH OH t R The number of statement s incorrect for the above reaction is a i On increasing solvent polarity there is no change in ratio P R P ii On increasing solvent polarity ratio increases R iii On decreasing solvent polarity ratio increases iv Above reaction is only favourable in acetone solvent R Answer 0 01 02 03 04 05 06 07 08 9

SolveLancer Test Sodium bicarbonate on heating gives impurity water and carbon dioxide If 2 4 g sample of sodium bicarbonate has 40 purity then loss in weight of the sample on heating will be SolveLancer Test a 62g b 2 4g c 0 35g d 0 1g

Q 30 75 A very dilute saturated solution of a sparingly soluble salt AB has a vapour pressure of 20 mm of Hg at temperature T while pure water exerts a pressure of 20 0108 mm Hg at the same temperature Calculate the solubility product constant of AB 2 at the same temperature 10 10 4x10 6

Alkyl fluorides generally give Hoffman s elimination product This is because Fe being a good leaving group creates cationic character in the transition state Fe being a poor leaving group creates cationic character in the transition state Fe being a good leaving group creates anionic character in the transition state being a poor leaving group creates anionic character in the transition state Fe

33 The equilibriurn constants for the following reactions at 1400 K are given 2H O g 2H2 g O g K 2 1 10 13 2CO2 g 2CO g 0 g K 1 4 10 12 Then the equilibrium constant K for the reaction H2 g CO2 g CO g H O is A 2 04 B 20 5 C 2 6 D 8 4 ADITYA TALENT SCHOO

When a gas is doubled through water at 298 K a very dilute solution of the gas is obtained Henry s law constant for the gas at 298K is 100 kbar If the gas exerets a partial pressure of 1 bar then number of millimoles of the gas dissolved in one litre of water is A 0 555 C 0 0555 B 5 55 D 55 5

The first step in the breakdown of methane is in the atmosphere is the reaction OH CH4 CH3 H2O Derive an expression for the lifetime of methane due to reaction with OH radicals by integrating the first order rate law Explicitly state assumptions you make in deriving the expression

that the solution is ideal III Show that if Raoult s law is applicable to one of the constituents of a binary liqu mixture at all composition it must be equally applicable to the other constituent

A 0 3 molal solution of a complex compound decreased the freezing point of pure water by 0 558 C The complex compound is known to show geometrical isomerism also which of the following may represent the complex compound Kf H O 1 86 K kg mol O CrCl3 NH3 3 O O Pt NH3 3 H2O 3 CI4 Pt NH3 2C14 Pt gly 2

AH enthalpy of formation of a vacancy is positive OAH enthalpy of formation of a vacancy is negative regarding Entropy of crystal increases due to a vacancy formation More vacancies are formed at a higher temperature

10 For the substance of atomic mass 63 1u X ray diffraction studies determine the edge length that is 4 x 108 have a density of 6 8 g cm What are the numbers of atoms per unit cell cm tions 1 1 2 2 3 3 1 One 2 Two 3 Three 4 Four Question Type MCQ Question ID 1908891225 Option 1 ID 1908895073 Opion 2 ID 1908895074 Option 3 ID 1908895075 Option 4 ID 1908895076 Status Answered Chosen Option 1

The following set of choride analyes on separate aliquots of serum were reported 103 meq L 106 meq L 107 meq L 114 meq L One value appears suspect Determine if it can be ascribed to accidental error b performing Q test

Column I Process A Reversible isothermal compression of P AS sys an ideal gas system Q B Isothermal free expansion Pext 0 of Q AS an ideal gas system P C Reversible adiabatic expansion of an R AS ideal gas R D Reversible ideal gas expansion system Entropy Change 0 0 Column II 0 S Information insufficient

The ratio of the masses of nitrogen and hydrogen present in 1 g of ammonia is 14 3 How many times the mass of 1 g of hydrogen atoms would nitrogen weigh in 2 5 g of ammonia O OO 14 3 35 3 14 3 35

A groundwater sample 1 liter with a pH 8 3 and an alkalinity of 100 mg CaCO3 L is titrated with 0 1 M HCl to a measured pH of 6 0 What is the alkalinity of the titrated groundwater at a pH 6 0

Element A has 5 isotopes Out of every 220 A atoms 11 atoms have a mass of 176 u 41 8 atoms have a mass of 177 u 59 4 atoms have a mass of 178 u and the other two have a mass of 179 u and 180 u The relative atomic mass of X is 178 49 Calculate the percentage abundance of A 179 and 178 A Write the nuclide symbol of the most abundant isotope of this element

The number of collisions taking place per second per unit volume of the reaction mixture www KIITians Hence the collision frequency z is directly proportional to the square root of the absolute temperature T Collision Theory Chemistry Class 12 IIT JEE Main Advanced NEET AIPMT askIITians 1 359 views 110 Z askiitians 33 6K subscribers 8RT TTM 6 Share Download Save SUBSCRIBE

The reaction N O5 in CC14 solution 2NO2 solution 0 g 2 is of first order in N O5 with rate constant 6 2 10 s What is the value of rate of reaction when N O5 1 25 mol L A 7 75 x 10 mol L s B 6 35 10 mol L s C 5 15 x 10 5 mol L s D 3 85 x 10 mol L s

224 A volume of T hydrogen gas measured at 0 C and 1 atm forms a uniform monolayer at 25g copper The cm A 0 16 density of liquid hydrogen is The specific surface area of copper in m g is N 6 10 3 g cm T

1 8 and 1 2 25 and 1 3 2 and 4 The energy of an electron in first Bohr orbit of H atom is 13 6 eV The energy value of electron in the excited JEE MAINS ONLINE 2014 state of Li2 is 4 30 6 eV 1 30 6 eV 2 27 2 eV 1813 3 27 2 eV

A sample of a radioactive substance undergoe 80 decomposition in 345 minutes Its half life minutes 1 3 In 2 In 5 In 5 In 4 x 345 345 2 4 In 5 x 345 In 2 In 4 In 5 345

16 An anti freeze solution is prepared from 222 6 g of ethylene glycol C H OH and 200 g of water Calculate the molality of the solution If the density of this solution be 1 072 g mL what will be the molarity of the solution

224 A volume of cm hydrogen gas measured at 0 C and 1 atm forms a uniform I 0 16 monolayer at 25g copper The density of liquid hydrogen is area of copper in m g is N 6x10 YOUR ANSWER T g cm The specific surface 4

b On dissolving 3 24 g of sulphur in 40 g of benzene boiling point of solution was higher than that of benzene by 0 81K K 2 53 K kg mol What is molecular formula of sulphur Atomic mass of S 32 g mol

Which of the following option is not matched correctly with charge on colloidal particle Al2O3 xH O positive sol Methylene blue positive sol As S3 negative sol Congo red sols positive sol

1 The vapour pressure of pure benzene and toluene at 40 C are 184 0 torr and 59 torr respectively Calculate the partial pressure of benzene and toluene the total vapour pressure of the solution mole fraction of benzene0 40 at solution and ass that the solution is ideal

36 ii Choose the correct option Mark only one oval 0000 In mixture A A Vmixing 0 and AH mixing 0 In mixture B A Vmixing 0 and AHmixing 0 In mixture A A Vmixing 0 and AH mixing 0 In mixture C A Vmixing 0 and AHmixing 0

Depending on the vapour pressures of pure components 1 and 2 total vapour pressure over the solution decreases or increases with increase in the mole fraction of component 1 I have two questions 1 why total vapour pressure over the solution can decrease as well as increase by only increase in the x1 no clear direct or inverse relationship between total vapour pressure and x1 why only x1 is chosen not x2 estion asked by Navya Student at 24 Aug 2021 08 18 41

Define Le Chatelier s Principle in your words What will happen if A we increase the amount of reactants B decrease the overall pressure of the reaction mixture at equilibrium Give examples to explain that

pressure of 0 80 atm is kept in a glass that the vessel can withstand a pressure of 2 0 atm How high can you raise the temperature of the gas without bursting the vessel nd a a 745 C b 472 C c 500 C d None of these 38 Which one of these graphs for an ideal gas the arrow indication is incorrectly marked P J005 6 a O P decreasing Volume Temp in K noolled out to ora Increasing Temperature b Son 1 08 ai st Ozar 3 273 d P decreasing Pressure b 7 6 x 10 19 arbsp Him tartal SA Song d 9 7x10 1 C 4 86 decreasing muitas pronks w Pressure iguse to vtianab af 0 0 1 V Bain 34 The pressure of sodium vapour in a 1 0 L container is 10 torr at 1000 C How many atoms are in the container a 9 7 x 10 7 c 4 2 x 10 7 h 0 AI enistr o noolled A 2 01 lobo ales 20 lit1 am and

The Henry law constant for N and O2 gas dissolved in water at 298K are 6 x 109 N m and 2 5 109 N m A sample of water at 298K was equilibrium with air containing 20 mole oxygen and 80 mole nitrogen at 1 atm If the dissolved gases were separated from a sample of this water and then dried Then calculate the mole of oxygen gas in the dried gaseous sample

0 sho below Pt s 1 A latm 1 A xM B YM IB s The emf measured is 0 30V The cell reaction 1 A 2B 2A 2B 110 2 A 2e 2A 2B 2e2B 3 The cell reaction cannot be predicted 4 2A 2B A 2B

56 Reaction rate between two substances A and B is expressed as following rate k A B m the concentration of A is doubled and concentration of B is made half of initia concentration the ratio of the new rate to th earlier rate will be 1 m n 2 1 2 m n 3 2 n m 4 n

36 A is a primary alcohol used as a solvent Treatment of A with PCC produces B B gives positive Tollen s test A when treated with the mixture C forms yellow crystalline precipitate with characteristic smell Identify A B the composition of mixture C and the yellow precipitate 0000 A PCC B 49 i Identify the following Mark only one oval A Pentanol B Propanone C lodine sodium hydroxide yellow ppt lodoform A Ethanol B Propanone C lodine sodium hydroxide yellow ppt chloroform Ethanoic acid 2 Propanol TOLLENS A Ethanol B Ethanal C lodine sodium hydroxide yellow ppt lodoform A Ethanol B Ethanoic acid C lodine sodiumcarbonate yellow ppt lodoform 50 ii The same yellow crystalline precipitate is also formed when the compound X is treated with the same reagent C Then compound X can be Mark only one oval 1 point 1 point

10 Obtain an expression relating the torque with angular acceleration for the rigid

Aqueous solution of glucose and compound X are place in beaker A and B respectively in closed chamber AA A contains 40 w W C6H12O6 aq Solution and B contains 10 aq w W Solution of X non electrolyte What is the molecular mass of compound X A B 30 40 50 35 Closed chamber

If SRP of substance is 0 5 V then reduction of substance is possible only in basic medium SRP of water is 0 8274 V and at reduction potential is zero at pH 7 The voltage of mercury cell remains constant for longer period of time It is because net cell reaction does not involve ions Lead storage battery is a galvanic cell without salt bridge A secondary cell is rechargeable cell The SRP of three metallic ions A B C are 0 3 0 5 0 8 volt respectively so oxidizing power of ions is C A B Higher the SRP higher the oxidizing power Onli If SOP of substance is less than 1 23 V and over voltage 0 V then its oxidation in its aqueous solution is not possible at 298 K Standard reduction potential SRP of water is 1 23 V We cannot add the electrode potential in order to get electrode potential of third electrode if no of moles of electrons exchanged are not same

produced by the passage of 4F electricity Calculate the cell potential in V if AG 96 5 kJ mol and n 1 If K for the reaction Cu2 aq Sn2 aq 4 Sn aq Cu s at 25 C is represented as 2 6 x 10 then find the value of y Given Eu C 0 34 V Es Sn4 Sn 0 15 V If AG for the half cell MnO4 MnO2 in an acid solution is xF then find the value of Given E O MnO4 Mn2 1 5 V E MnO 2 Mn2 1 25 V If the equilibrium constant for the reaction Cd aq 4NH3 aq Cd NH3 aq i then find the value of x Given Eca cd 0 4 V E Cd NH3 2 Cd 0 61V

From the concentrations of C H Cl butyl chloride at different times given below calculate the average rate of the reaction CH Cl H O during different intervals of time C H OH HCl t s 0 C H CI 0 100 mol L 50 100 150 200 0 0905 0 0820 0 0741 0 0671 t s 300 400 700 C H Cl 0 0549 0 0439 0 0210 mol L 1 800 0 017

For the metallurgical process which combination of ores are calcined and can further be reduced by carbon O Haematite and iron pyrites O Haematite and calamine O Calamine and sphalerite O Sphalerite and iron pyrites

Which of the given statements are incorrect 1 Lime stone is used as flux in the extraction of iron from haematite II Slag separates more easily from ore than the gangue III Froth floatation cannot be used for the benefaction of chalcopyrite IV For zone refining the melting point of the metal should be greater than the impurity O 1 and II only O II and III only O III and IV only O 1 11 and IV only

Which of the following is INCORRECT statement O In adiabatic expansion of an ideal gas temperature of system always decrease O In isothermal expansion of an ideal gas temperature of a gas always remains constant O In a reversible adiabatic compression of an ideal gas change in entropy of system is zero In an irreversible adiabatic compression of an ideal gas change in entropy of system is positive

17 Electronic configuration of an atom 1s 2s 2p6 3s 3p6 3d5 4s 1s 6 2p 2s ORG 3s 3p 3d 4s Choose the correct statement regarding this E C 1 It represents the ground state of Cr 2 It violates Aufbau principle 3 It violates Hunds rule of maximum multiplicity