Physical Chemistry Questions

4 6 9 x 10 Rate law of reaction H g Br g 2HBr g is r k H Br 2 Molecularity of reaction is 1 2 2 3 2 3 1 4 Not defined 3 0 69 4 6 9 x 10 52 fushan H Br g 2HBr fer f H Br f fuffo argi 1 2 2 3 2 3 1 4 ff

estion 16 Which of the following solutions is expected to have the highest conductivity O 0 200 MK S04 O 0 100 M K3PO4 O 0 200 M KOH O 0 100 M KNO3

9 gmp Consider the following liquid vapour equilibrium Liquid Vapour Which of the following relations is correct aup 1 3 dinP AH dT dinP dT 10 If the C RT AH RT 2 T 4 equilibrium duloa riliw a lODA ONO dinG AH dinP dT NEET 2016 RT2Nq AH T 1 constant 8 viilidulos ent 1 1

ays that pairing will not done until each orbital will have atleast one electron so 3 ption satisfy hunds rule plss explain un 4 2021 9 28 12 PM Answered 135 Which of the following is violating Hund s rule 1 1 11 2 1 16 14 3 1 1 4 All of the above

0 An example of a disproportionation reaction is JEE Main 2019 1 2MnO4 101 16H 2Mn 512 8H O 2 2CuBr CuBr Cu 3 2KMnO4 K MnO4 MnO O 4 2NaBr Cl 2NaCl Br

A of 0 01M MgCl is 220 S cm mol X of MgCl is 240S cm mol 1 A of Mg2 is 100 S cm mol 1 All above measurements are done in an electrolytic cell Assuming MgCl to be a strong electrolyte which of the following is correct Limiting equivalent conductivity of MgCl is 480 S cm eq O A of MgCl varies linearly with concentration O of 0 04M MgCl will be 160 S cm mol O A A of 0 04M MgCl will be 200 S cm mol

An electron in a hydrogen atom is in gr ound state It is excited to a state wher e its path length is five times its de Bro glie wavelength From there it transits b ack to ground state producing maximu m number of photons possible If the s econd highest energy photon emitted fr om this transition is used to excite a Li 2 ion in an excited state find the final excited state to which the Li2 electron jumps

If the solution of CuSO4 in which copper rod is immersed is diluted to 10 times the reduct electrode potential E 0 34 V get Cu 2 Cu A Increases by 0 03V C Increases by 0 059V B Decreases by 0 03V D Decreases by 0 059V

The unit cell of diamond is made up of 2 6 carbon atoms 4 atoms constitute ccp and two atoms occupy half of octahedral voids 8 carbon atoms 4 atoms constitute cop and 4 atoms occupy all the octahedral voids 8 carbon atoms 4 atoms form fcc lattice and 4 atoms occupy half of the tetrahedral voids alternately 12 carbon atoms 4 atoms form foc lattice and 8 atoms occupy all the tetrahedral holes Correct Answer 3 Status unattempted

2 moles of an ideal monatomic gas is expanded according to relation PT constant from its initial state P V to the final state due to which its pressure becomes half of the initial pressure The change in internal energy is 1 d P v o 2 d P v o 0 3 d 2 P o V o 5 4 d P o V

5 Which of the following is true according to variational theorem I The ground state energy of a quantum mechanical system is zero II III w H w v v v H v Eo Eo IV The ground state energy of a quantum mechanical system is infinite A I and II B II only C III only D I and IV

Relative lowering in vapour pressure RLVP of acetone solution containing Nal is 0 2 How much acetone is further needed to be added to the ame solution to make the RLVP to 0 1 Initial solution contains 10 mole acetone assume 100 ionization of Nal and PAcetone 200 Torr at 300 22 5 mole 12 5 mole 10 mole

The value of AH for the reaction X g 4Y g 2XY4 9 is less than zero Formation of XY g will be favoured at AIPMT Prelims 20117 1 High pressure and low temperature 2 High tremperature and high pressure 3 Low pressure and low temperature 1 4 High temperature and low pressure

Colloids with liquid as dispersed phase and dispersion medium are called as emulsion Identify the correct statement O Oil in water emulsion are very stable The emulsifying agent forms an interfacial film between suspended particle and the medium Any amount of dispersed phase can be O added to emulsion to concentrate it without forming a separate layer The droplets in emulsion must be positively charged

A cell contains two hydrogen electrodes The negative electrode is in contact with a solution of 10 6 M H ions The emf of the cell is 0 118 volt at 25 C The H at positive electrode is

SolveLancer Test In the following reactions if initially 100 moles of A were taken then calculate sum of moles of D and C after the reaction A 2B 40 50 a 180 b 140 c 160 d 200 3B D 4C SolveLancer Test

When H O is added to an acidified solution of K Cr O7 then O O O solution turns green due to formation of Cr O3 solution turns yellow due to formation of K CrO a blue coloured compound CrO 02 2 solution gives green ppt of Cr OH 3

32 Which is the strongest acid pK value is given HCOOH 3 771 a 2 c CH3COOH 4 7 33 Given Enthalpy of ionization of two acids b C6H5COOH 4 22 ROOD d CH3CH COOH 4 88

A reaction to convert ammonia into nitric acid involves the following chemical equation 4 NH3 g 5 O2 g 4 NO g 6 H2O g Assume that 1 50 g of NH3 reacts with 2 75 g 02 i Determine the limiting reactant ii Calculate how many grams of NO and H2O will form in the reaction above iii Calculate how many grams of the excess reactant will remain after the reaction is complete iv If the yield obtained for NO is 1 80 grams and yield obtained for H2O is 1 50 grams calculate the percent yield of NO and H2O in this reaction Atomic mass of N 14 O 16 H 1

The chemical nature of hydrogen peroxide is JEE Main 2019 1 Oxidising and reducing agent in both acidic and basic medium 2 Oxidising and reducing agent in acidic medium but not in basic medium dic 3 Reducing agent in basic medium but not in acidic medium 4 Oxidising agent in acidic medium but not in bonio lium

One mole I solid is added in 1 M 1 litre Kl solution Then 1 Osmotic pressure of solution increases 2 Freezing point of solution increases 3 Relative lowering in vapour pressure decreases 4 No change in boiling point of solution

A binary solution of liquid A and B PA POXA PO PO s shows large positive deviation from Raoult s law then select the correct statement s relationship s AV x 0 Boiling point of the solution must be less than boiling of liquid B Boiling point of the solution must be less than boiling point of liquid A

SolveLancer Test The converting it from to make the enamel on teeth harder by SolveLancer Test a Fluoride ions fluorapatite hydroxyapatite b Fluoride ions hydroxyapatite fluorapatite c Fluoride ions chlorapatite hydroxyapatite d None of these

Identify the number of processes with AG 0 a H O 1 0 C 1 atm H O g 0 C 1 atm b H O l 100 C 1 atm H O g 100 C 1 atm c H O 1 27 C 0 04 atm H O g 27 C 0 04 atm d H O s 10 C 0 01 atm H O g 10 C 0 01 atr e H O 1 0 C 1 atm H O s 0 C 1 atm f H O l 100 C 1 atm H O s 100 C 1 atm g H O 1 100 C 1 atm H O g 100 C 0 1 atm h H O 1 0 C 1 atm H O s 0 C 5 atm Vapour pressure of water at 27 C 0 04 atm Vapour pressure of ice at 10 C 0 01 atm

43 How much water must be added to 300 mL of 0 2 M solution of CH3COOH K 1 8 10 5 for the D O D a of the acid to double b 900 mL a 600 mL 1200 mL d 1500 mL 44 What is NH in a solution that contain 0 02 M NH 3 K 1 8 10 5 and 0 01 M KOH

the difference of two electrode potential val ues corresponds to a positive electrode pot ential and consequently negative change in Gibbs free energy in equation then the less r eactive metal will come out of the solution a nd the more reactive metal will go into the s olution tell me the mechanism how this hap pens

R shown below The overall yield of the major product R from P is 90 What is the amount in grams of R obtained from 18 6mL of P Use density of P 1 00 g mL 1 Molar mass of C 12 0 H 1 0 0 16 0 and N 14 0 g mol 1 NH 44 45 46 46 ConH SO4 ConHNO3 1 Zn HCI Q minor 2 HNO R

Non stoichiometric cuprous oxide Cu 0 can be prepared in laboratory In this oxide copper to oxygen ratio is slightly less than 2 1 Select correct statement It shows metal deficiency defect O O This substance can act as p type semiconductor In this compound copper exist as 1 2 oxidation state All of these

Sir Mam plz explain answer in very easy approach Sir Mam plz explain answer from the Lines of NCERT If 80 of a first order reaction was completed in 80 minutes then 50 of the same reaction would be completed in log 5 0 7 log 3 0 48 1 40 minutes 2 70 minutes 3 64 5 minutes 4 34 4 minutes

44 Henry s law constant for the solubility of N in water at 25 C is 105 atm and air is supposed to be 1 4 mixture of O and N Determine the number of moles of air dissolved in 1 mole water at 5 atm pressure acule

SolveLancer Test Select the correct statement for the reaction 2A s B g 3C g 4D l SolveLancer Test a 2 moles of A always produce 3 moles of C and 4 moles of D b 22 4 of B g produces 3 moles of C at 1 atm and 273 K in excess of A c B will always remain in excess because volume of gas is very high than solid d Moles of D produced is always less than C because volume of liquid is less than gas

Lead is a poisonous element which may lead to anemia brain and kidney diseases upon exposi to high levels of lead An ionic mechanism leads to lead toxicity due to the ability of lead ions replace ions like Ca Mg2 Fe2 and Nat Consequently the biological metabolism of cell is disturbed The metal is oxidized to the 2 charged ion in acidic solution as follows Take concentration of the lead ion as 0 025 M and the pH of the medium as 2 2 a What is Ecell

49 In the reaction NH NO aq N g 2H O the volume 49 of N after 20 min and after a long time is 40 ml and 70 ml respectively The value of rate constant is 1 log 2 1 7 20 4 log min 2 303 20 1 4 3 log min 1 log Min 2 303 20 7 log min 4 3 0 125 N min are afr ml at ar 1 1 log 20 2 3 2 303 20 log 20 2 303

1 6 4 43 fffe 2 7 9 3 9 6 ia ad fhda effe 4 11 6 vifaa i COCI g CO g Cl g ii CH g 2S g CS g 2H S g iii CO g C s 2CO g iv 2H g CO g CH OH g v CaCO3 s CaO s CO g vi 4NH g 50 g 4NO g 6H O g 2 3 1 1 3 5

EXTRACTION OF ALUMINIUM 123 Bauxite ore can be represented as AIO OH 2 the value of x ranges between 1 0 to 1 3 0 to 1 5 4 3 vide impurities 2 1 to 2 4 0 to 1 3 associated with bauxit

The corrosion of iron is an electrochemical process that involves the standard reduction potential given here at Fe ag 2e Fe s E 0 44 V O g 4H ag 4e 2H O l E 1 23 V The voltage if the reaction occurs at pH 4 0 but all other concentration are maintained as they were in the standard cell Given 2 303 RT F 0 06 V O O O 1 43 V 1 67 V 0 44 V

SolveLancer Test Starting from the position of Mg in the modern periodic table Go one step to the left and three steps down Note the element and what will be the atomic number of that element SolveLancer Test a 37 b 19 c 55 d 879

into n comes Mis bigger a 45 completed one oscillation c 60 a 2 3 b 90 d 30 3 The amplitude of a particle executing SHM is 4 cm At the mean position the speed of the particle is 16 cm s The distance of the particle from the mean position at which the speed of the particle becomes 8 3 cm sec will be b 3 d 2 em after the c 1 4 What is the phase difference betwaon

Among the following trends of properties correct order is are Order of C O bond length is CO CO CO Order of boiling point is CH4 SiH4 GeH Order of polarity of bond HF HCl HBr Number of unpaired electrons B C N O

5 If the value of an equilibrium constant for a particular reaction is 1 6 x 1012 then at equilibrium AIPMT 2015 the system will contain 1 Similar amounts of reactants and products 2 All reactants 3 Mostly reactants 4 Mostly products bo extil OS

Identify the chemical reaction s in which the amount of heat evolved is so large that the metal is produced in the molten state a Reaction of solid iron oxide and solid aluminium b Reaction of zinc oxide and carbon c Reaction of manganese oxide and aluminium d Reaction of magnesium chloride solution and aluminium metal

A chiral center with R configuration rotates the propagation plane of light in clockwise direction rotates the propagation plane of light in counter clockwise direct Is always a D configuration Is always an L configuration None of the answers provided

14 Consider the following reaction Cu Zn Zn Cu a Depict the galvanic cell in which the given reaction takes plac b Give the direction of flow of current c Write the half cell reaction taking place at cathode and anod

Consider the following table Element Atomic number A B C D 18 10 13 12 Which of the given statements is are correct a The compound formed by elements A and D ionic in nature b The compound formed by elements B and D soluble in kerosene c The compound C A3 is amphoteric in nature d Aqueous solution of compound AB conducts electricity

In August 1986 a cloud of CO gas suddenly erupted from a lake in Cameroon killing several people Which of the following could have caused this accident I Over the years CO g would have got saturated in the upper layers of the lake water II Heavy winds could have overturned the water in the lake III Over the years CO g would have got saturated in the bottom layers of the lake water IV This incident could be related to Raoult s law A I II IV B II III C II III IV D I IV

147 In freundlich adsorption isotherm the value of 1 n is A between 0 and 1 in all cases B between 2 and 4 in all cases C 1 in case of physical absorption D 1 in case of chemisorption

A chemical process occurring in two steps is plotted as 2 1 Endothermic 2 2 Energy if n 3 A B The correct statement is Progress of Reaction A B 2 Exothermic X A B 3 Exothermic X X A B 4 Endothermic AB A B X fast X AB slow X slow AB fast X slow AB fast X fast

Dinary mixture containing two volatile liquids A and B is in equilibrium with its vapours Identify the incorrect statement s Sum of number of moles of A and B in vapour state is equal to the sum of number of moles of A and B in liquid state lya and ye are mole fractions of A and B in the vapour phase respectively P and Pg are vapour pressures of pure liquid A and pure liquid B respectively Ye PP P OP Ye Vapour pressure of the given binary mixture in 1 L container is 100 mm Hg If volume of container increases to 2 L then vapour pressure will become 50 mmHg at the same temperature 18 12 55 A 17

400 mL of aqueous CuSO4 solution was electrolysed using Pt anode and Cu cathode A constant current of 3 2 mA was passed for 28 95 min It was found that after electrolysis the absorbance of the solution was reduced by 50 of its original value Calculate the concentration of CuSO in the solution to begin with Take 1 F 96500 C mol O 1 44 10 M 02 88 10 5 M 7 2010 M O 43210 5 M V

If enantiomer A has a specific rotation of 44 5 the specific rotation of the diastereomer of A must be 135 5 degrees can not be predicted with the limited information given must be 44 5 degrees plen he 445 degrees