Physical Chemistry Questions

Equation for Boyle s Law is A skipped B C D dP P dP P P dv dv 29 d v dT

Conductivity of 0 1 M CH3COOH solution is measured in a conductivity cell that has cell constant 4 cm and resistance of 0 1 M CH3COOH solution is 1000 Q If molar conductivity of CH3COO and H at infinite dilution is x S cm mol 1 and 360 S cm mol 1 The value of x is If degree of dissociation of 0 1 M CH3COOH is 0 1

Consider the following electrochemical cell Zn Zn H H g Pt s 0 01 M x M 1 atm E Zn 2 Zn 0 77 V The E M F of cell at 25 C is equal to E cell The pH of solution in cathodic chamber is

At identical temperature and pressure the rate of diffusion of hydrogen gas is 3 3 times that of a hydrocarbon having molecular formula CnH2n 2 The value of n is A 1 B

1 g of non volatile solute AB2 is dissolved in 400 g of ethanol The depression in freezing point is found to be 0 5 C If molar mass of AB2 is 20 g mol If the degree of dissociation of AB2 is Kf of ethanol 2 K kg mol AB dissociate into A and B x The value of 10 x is

Which statement is FALSE concerning the chemical reaction below Energy CaCO3 s CaO s CO2 g O A Rate k OB AG is temperature dependent OC The entropy of the products is greater than the entropy of the reactar OD The reaction is exothermic OE Increasing the temperature may increase the rate of this reaction

49 The unit cell of a binary alloy composed of A and B metals has a ccp structure with A atoms occupying the corners and B atoms occupying centres of each face of the cube If during the crystallization of this alloy in the unit cell two A atoms are missed the overall composition per unit cell is a AB6 c ABg b ABA d A6B24 J K CET

Substances are classified into different types on the basis of their magnetic properties Which of the following types have maximum magnetic moment aligned in a particular direction Diamagnetic Ferromagnetic

1 Explain why i A gas fill a vessel completely ii Camphor disappears without leaving any residue iii The temperature does not rise during the process of melting and boiling through heat energy is constantly supplied iv Water stored in an earthen vessel becomes cool v An iron almirah is a solid at room temperature

Your Answer Answer Question 9 5 points 41 Listen 90 0 mL of 0 30 M HF K 7 2 x 10 is titrated with 5 0 mL of 0 60 M NaOH Calculate the pH at this point in the titration Your Answer

A mixture of 2 102 molecules of P and 3 10 molecules of Q weighs 0 60 g If the molecular mass of P is 45 then the molecular mass of Q will be N 6 10 A 45 C 90 B 180 D 270

At 1 0 atm the air in a pilot s lungs occupies 1 0 L The pilot ascends to an altitude where the pressure is 0 50 atm If the pilot holds her breath during her ascent what is the new volume of the air in the pilot s lungs 2 0 L O 0 7L 5 7 L 0 85 L 0 18 L

45 Total no of voids in 0 5 mole of a compound formin closed packed structure are hexagonal a 6 022 1023 b c 9 033 x 1023 d 3 011 x 1023 4 516 1023

Write the cell notation for standard cells based on the following reactions a the oxidation of silver by nitric acid assume that nitric acid is reduced to NO b Zn s 2Ag NH aq 2 2Ag s Zn NH aq

With the help of following reactions arrange metals A B D and E in decreasing order of their reactivity a B ANO3 BNO3 A b A HCI ACI c D ECI DCI E d D HNO3 No reaction Question Type Single Correct Type 1 B D E A H 2 2 B A D E 3 E D B A

For the reaction 2Fe aq 21 aq 2Fe aq 1 s the magnitude of the standard molar free energy change 4 Gm kJ Round off to the Nearest Integer E Fe Fe s 0 440 V E E 12 21 0 539 V Fe s F 96500 C Fe 3 0 036 V

Which statement concerning solution concentration is TRUE A A 5 0 ppm solution is more concentrated than a 5 0 m m solution OB A solution that is 1 5 ppt is less concentrated than a solution that is 1 5 ppm OC The ppm unit of concentration is typically used for very high concentrated solutions OD If a bottle is labeled 0 25 M Ca OH 2 the concentration of OH ions in solution is 0 50 M OE If a solution is 12 m m it will also be 12 m V

Q 38 The E values of the following reduction reactions are given 3 Fe aq e Fe aq E 0 771V Fe aq 2e Fe s E 0 447V What will be the free energy change for the reaction given below 3 Fe aq 3e Fe s 1 F 96485 Cmol 18 51 kJ mol 1 11 87 kJ mol 1 8 10 kJ mol 1 1041 kl mol 1

Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true Question Type Single Correct Type 1 2 3 Roasting of the sulphide to the oxide is thermodynamically feasible Carbon and hydrogen are suitable reducing agents for all metal oxide The AfG of the sulphide is greater than oxide The AfG is negative for roasting of

An oxygen 0 molecule is adsorbed on a patch of surface see sketch at right This patch is known to contain 900 adsorptic sites The 0 molecule has enough energy to move from site to site so it could be on any one of them Suppose part of the surface becomes inaccessible so that only 784 adsorption sites are now available for the molecule Calculate the change in entropy Round your answer to 3 significant digits and be sure it has the correct unit symbol 0 2

Q 43 Under similar conditions of pressure and temperature 40 ml of slightly moist HCI gas is mixed with 20 ml of NH3 gas the final volume of the gas at the same temperature and Pressure will be 100 ml 20 ml 40 ml 40ml

A solid XY has NaCl structure If radius of X is 100pm What is the radius of Y ion 1 120pm 2 136 6 to 241 6 pm 3 136 6pm Which type of chemical substance is Disparlure 4 241 6pm 1 Preservative 2 Pheromones 3 Antioxidant 4 Detergent At what temperature will the molar kinetic energy of 0 3 mol of He be the same as that of 0 4 mol of argon at 400K 1 700K 2 500K 3 800K 4 400K Reaction A B C D follows rate law R KIAF B12 starting with 1 M of A and B What is time

36 A crystalline solid XY3 has ccp arrangement for its element Y X occupies a 66 of tetrahedral voids b 33 of tetrahedral voids c 66 of octahedral voids d 33 of octahedral voids Karnataka CET

The minimum amount of O g consumed per gram of reactant is for the reaction Given atomic mass Fe 56 0 16 Mg 24 P 31 C 12 H 1 1 C3H g 5O g 3 CO g 4H O l 3 4 Fe s 3 O g 2 FeO3 s JEE MAINS C 2 P4 s 5O g P4010 s 4 2 Mg s O g 2 MgO s

1 a Sciff s base 2 an immine 3 an amine 4 an enamine When 0 1 mol of CH3NH2 ionisation constant K 5 x 10 is mixed with 0 08 mol HCI and the volume is made up to 1 litre Find the H of the resulting solution Given log2 0 3 3 1 23x10 2 2x10 1 8x10 4 8x10 A compound contains 1 08 mol of Na 0 539 mol of Cu and 2 16 mol of F Its aqueous solution shows osmotic pressure which is three times that of urea having same molar concentration The formula of the compound in t

1 Preservative 2 Pheromones 3 Antioxidant 4 Detergent At what temperature will the molar kinetic energy of 0 3 mol of He be the same as that of 0 4 mol of argon at 400K 1 700K 2 500K 3 800K 4 400K Reaction A B C D follows rate law R K A B starting with 1 M of A and B What is time taken for concentration of A to become 0 1 M Given K 4 606 x 10 s 1 1000 s 2 1500 s 3 2000 s 4 5000 s

What is the purpose of a control To determine the effect of a new variable on a system To influence a system in a predetermined way to test the hypothesis To alter a system in an unknown way to test the hypothesis To include a variable that could influence experimental results but does not reflect the planned changes that might re manipulating the independent variable

The effective nuclear charge often symbolized as Zeff or Z is the net positive charge experienced by an electron in a multi electron atom The term effective is used because the shielding effect of negatively charged electrons prevents higher orbital electrons from experiencing the full nuclear charge 15 18 you write shielding effect of negative charge electron and higher orbital electron now can we tell that shielding effect of negative charge electron is nucleus nearer electron and higher

When ferrous oxalate is titrated K Cr O milli equivalents of Fe C O2 and 4 2 Cr O in the redox reaction are X Y and Z 7 respectively then 1 X Y Y 2Y Z Y 2 X Y Z 4 2X 6Y 6Z

4 If both Assertion Reason are false Assertion On a rainy day it is difficult to drive car or bus at high speed Reason Assertion The value of coefficient of friction is lowered on wetting the surface It is difficult to move a cycle along the road with its brakes on

AAJ KA TOPPER In Dumas method 0 5 g of an organic compound containing nitrogen gave 112 ml of nitrogen at S T P The percentage of nitrogen in the given compound is 1 28 2 38 3 18 4 48 50 ml10N H SO 25 ml 12N HCL and 40ml SN HNO Were mixed together and the volume

wood charcoal The final concentration of the solution after adsorption is 0 5 M Amount of oxalic acid absorbed per gm of charcoal is A 3 45 gm B 3 15 gm

The net reaction catalyzed by malate dehydrogenase is malate NAD oxaloacetate NADH H The standard reduction potentials for the half reactions are given in the table Oxidant Reductant E V malate 0 17 NADH 0 32 oxaloacetate 2H NAD H Calculate AE for the given reaction AFY Calculate AG for the given reaction AG

500 mL of 0 150 M AgNO3 solution were added in 500 mL of 1 09 M Fe solution and the reaction is allowed to reach an equilibrium at 25 c aq Fe Ag s Ag 2 3 aq Fe aq For 25 mL of the final solution 30 mL of 0 0832 M KMnO4 were required for oxidation Calculate equilibrium constant M of the reaction at 25 C Report your answer by rounding it up to nearest whole number

What is the molarity of a solution if 125 0 mL of it contains 6 89 g of KNO3 Molar mass KNO3 101 11 g mol A 0 545 M OB 0 554 M C 0 0545 M OD 5 45 x 104 M 5 54 x 104 M OES

The solubility of carbon dioxide gases in Coke is highest at OA low temperature and high pressure OB low temperature and low pressure OC high temperature and high pressure O D high pressure temperature is immaterial OE high temperature and low pressure

Estimate the boiling point of an organic compound CnH2n 2 in unit of degree Celsius C given the following thermodynamic parameters Temperature conversion K C 273 15 CnH2n 2 liq CnH2n 2 gas AfH kJ mol S J K mol Please keep your answer with one decimal place 281 8 162 1 234 3 280 6

The correct order of the decreasing ionic radii among the following isoelectronic species is 1 K Ca Cr S 2 Ca K S Cr 3 CI S Ca K 4 S C K Ca

The IUPAC name for Pt NH3 3 Br NO CI CI Question Type Single Correct Type 1 2 3 Triamminechloro bromo nitroplatinum IV chloride Triamminebromochloronitro platinum IV chloride Triammichlorobromoplatinum IV chloride Trimmingphloronitrobromo platinum IV

52 A metal crystallises into a lattice containing a sequence of layers as AB AB AB What percentage of voids are left in the lattice a 72 c 26 b 48 d 32 JIPMER AMU Med 2012

D Vapour pressure of a solution is 4 5 atm This solution has been separated from the solvent by semipermeable membrane If 5 2 atm external pressure is applied over the solution then 1 Osmosis will be stopped 2 Osmosis will be held in opposite direction 3 Solute molecules will start migrating 4 No effect on osmosis

44 Which one of the following combinations will give the highest stability to a nucleus 15 atomic number Z and mass number N Kerala PMT 200 a Even Z and odd N c Even Z and even N e Same value of Z and N nsp b Odd Z and even N d Odd Z and odd N TAIMS 200

6 The chemical formula is a short form rep resentation of a a compound c a mixture b an element d an alloy 7 Na C O is the formula of sodium a carbonate b oxalate c formate d acetate

LS0003 Liquids A and B form an ideal solution Calculate the mole fraction of A in the vapours above the liquid solution containing the liquids A and B in 2 3 mole ratio at equilibrium Given Po 0 4 atm P 0 8 atm

After oper anode is removed then what will happen NCERT Pg 85 DD 1 The cell will work as a capacitor 2 lons will start moving randomly 3 Current will continue to flow for sometime 4 Cathode rod will start working as both anode and cathode

For the equilibrium 2SO g O g 2SO3 g K 245 at 100 K The equilibrium concentrations are SO 0 204 M 0 0 0264 M and SO3 0 368 M Suppose that the concentration of SO is suddenly halved calcula Qc and use it to show that the forward reaction takes place to reach a new equilibrium

13 is Excess of NaOH aq was added to 100 mL of FeCl3 aq resulting into 2 14 Given molar mass of Fe 56 g mol 1 and molar mass of Cl 35 5 g mol JEE MAIN 1 1 8 M 2 0 6 M 3 0 2 M 4 0 3 M completely to CO2 and H O The empirical formula of compound CxH O is 1 C H603 The ratio of mass percent of C and H of an organic compound CyHyO is 6 1 If one molecule of the above compound CxHyO contains half as much oxygen as required to burn one molecule of compound CH 2 C H4O JEE MAINS 2018 4 C H4O3 O 3 C H4O2 our solution of KI INS ONLINE 2019

6 970 g of a non volatile solute is dissolved in 230 0 g of water The solute does not react with water nor dissociate in solution Assume that the resulting solution displays ideal Raoult s law behaviour At 60 C the vapour pressure of the solution is 147 48 torr The vapour pressure of pure water at 60 C is 149 40 torr Calculate the molar mass of the solute O121 g mol 30 g mol 42 g mol 78 g mol

A solution containing 2 7 x 10 3 mol of A2 ions required 1 6 10 3 mole of MnO4 for the oxidation of A2 to A03 the medium use is Question Type Single Correct Type 1 Neutral 2 Acidic 3 Strong basic

From now on we will not check the intermediate steps What is the value of k at 15 C k time s 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 absorbance 0 574 0 577 0 551 0 542 0 540 0 527 0 546 0 535 0 504 0 505 0 494 0 491 0 498 0 464 0 465 0 460 0 459 0 443 0 458 0 451 0427