Physical Chemistry Questions

How many kilojoules of energy is required to heat 54 0 g H 0 3 00 moles from a liquid at 19 0 C to a gas at 124 0 C The following physical data may be useful AHvap 40 7 kJ mol Cliq 4 184 J g C Cgas 2 01 J g C Csol 2 09 J g C Tmelting 0 C Tboiling 100 C

Find the odd man out a Tocantins c Roraima a Western part of Rajasthan c Western Andhra Pradesh a Evergreen forest c Temperate grasslands a Density of population c urban rural population b Rio Grande do sal d Amazonas b Gujarat d Eastern Maharash b Himalayan forest d deciduous forest b sex ratio d Human settlemer

18 Standard electrode potential for Sn 3 Sn 2 couple is 0 15 V and that for the Cr Cr couple is 0 74 V These two couples in their standard state are connected to make a cell The cell potential will be a 1 83 V c 0 89 V AIPMT P 2011 b 1 19 V d 0 18 V Y Y and

It is impossible for a reaction to take place 1 AH is ve and AS is ve 2 AH is ve and AS is ve 3 AH is ve and AS is ve 4 AH is ve and AS is ve

21 What is the ratio of volume of 1 mole of nitrogen gas to 16 g oxygen gas at STP 1 1 0 5 2 1 0 92 3 0 92 1 2

9 The rate constants k and k for two different 2000 T 1000 T reactions are 10 6 e and 10 5 1000 K e 3 3 respectively The temperature at which k k is 1000 a 2000 K b K d 2 303 2000 2 303 K 2008

20 mL of 0 1 M solution of compound Na2CO3 NaHCO3 2H O is titrated against 0 05 M HCI x mL of HCI is used when phenolphthalein is used as an indicator and y mL of HCI is used when methyl orange is the indicator in two separate titrations Hence y x is A B C D 40 mL 80 mL Correct Answer 120 mL None of these

33 An aquepus solution consisting of 5 M BaCl 58 8 w v NaCl solution 2m Na X has a density of 1 949 gm ml Mark the option s which represent correct molarity M of the specified ion uring potentieth Assume 100 dissociation of each salt and molecular mass of X is 96 A CI 20 M B Na 11 M C Total anions 20 5 M D Total cations 15 M Sol

Identify which of the following mixtures of conjugate base A weak acid HA OH and H that cannot be used to prepare a buffer to stabilize pH There may be more than one correct answer A A and H B HA and H C A and OH D HA and OH E HA and A

5 A compound CuCl has face centred cubic structure Its density is 3 4 g cm3 The length of unit cell is a 5 783A b 6 783 A De c 7 783 Y 2xn a x fKClis 1 9893 g cm and the length of d 8 783

c 6 03 x 1023 d 6 017 x 109 7 The unit cell cube length for LiCl just like NaCl structure is 5 14 Assuming anion anion contact the ionic radius for chloride ion is a 1 815 c 3 8 A b 2 8 A d 4 815 A temperature 18 10 Fcc sodium crystallizes in a bo 120 The theoret

B A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions The correct option about the gas and its compressibility factor Z is a Z 1 and repulsive forces are dominant b Z 1 and attractive forces are dominant c Z 1 and repulsive forces are dominant d Z 1 and attractive forces are dominant

Consider the Arrhenius equation given below and mark the correct option k Ae Ea RT i Rate constant increases exponentially with increasing activation energy and decreasing temperature ii Rate constant decreases exponentially with increasing activation energy and decreasing temperature iii Rate constant increases exponentially with decreasing activation energy and decreasing temperature iv Rate constant increases exponentially with decreasing activation energy and increasing temperature

is 1 50 g mL what is its concentration A 11 4 mol L B 8 9 mol L C 5 9 mol L D 18 5 mol L Calculate the percent of BaO in 29 0 g of a mixture of BaO and CaO which just reacts with 100 8 mL of 6 00 M HCL BaO 2HCl BaCl H O CaO 2HCl CaCl H O Calculate the amount of 95 pure Na CQ required to prepare 5 litro of 0 5 Maluti

8 Consider the following reaction at equilibrium in a closed container CaCO CaO CO2 g hich of the following statements is true if the volume of the container is increased A The concentration of CaCO3 would increase B The concentration of CaCO3 would decrease C The amount of CO would increase D The amount of CO would decrease

What is chemistry spontaneity How is AG related to spontanei Make up a reaction process that is i Always spontaneous ii Never spontaneous iii Spontaneous higher than a temperature iv Spontaneous lower than a temperature Examples A solid melts into a liquid and is exothermic 2 H O 1 H g O g AH 35 kJ

If a gas expands at constant temperature it indicates that a kinetic energy of molecules remains the same b number of the molecules of gas increases c kinetic energy of molecules decreases d pressure of the gas increases 2008

Which of the following order given below is are incorrect for the property indicated against it 3 OCT CIO CIO CIO CI O bond distance HCIO HBrO HIO acidic strength C1 F Br I Electron gain enthalpy H F H Cl H Br H 1 Bond energy

250 mL of hard water having hardness due to Caso is passed through anion exchange re in R OH 2 and water coming out of resin required 20 mL of 0 001 M H2SO4 for its titration Thus hardness of water in ppm of CaSO4 is of Caso 136 g

4 CH CHCICOOH In a solid AB having the NaCl structure A atoms occupy the corners of the cubic unit cell all the face centered atoms along one of the axes are removed then the resultant stoichiometry the solid is 1 AB 3 A4 B3 4 A B 2 A B

An LPG cylinder contained 15 kg of butane gas at 27 C and 10 bar pressure The cylinder leaked and it was found that after 4 days the mass of the gas left in the cylinder was onl 10 kg How much drop in pressure has occurred in each day 0 52 bar 0 833 bar 1 6 bar 1 832 har

Wrong statement regarding methyl carbonium ion CH3 A B C It is sp2 hybridised Vacant orbital is sp hybridised Vacant orbital is perpendicular to molecular planar and in pure p orbital It is electrophile with sextet of electron

Amongst Co ox CoF and Co NH3 6 1 Co ox and CoF are paramagnetic and Co NH3 is diamagnetic 3 2 Co ox and Co NH3 6 are paramagnetic and CoF is diamagnetic 3 Co ox and Co NH3 are diamagnetic and CoF is paramagnetic 4 Co NH3 and CoF are paramagnetic and Color 1 is diamagnetic 13

10 The mechanism of enzyme catalysed reac tion is given by Michaelis and Menten as step I E SES fast step II ESP E slow The rate of product formation may be K K E S dP given as where dt K K K S El is the total enzyme concentration For an enzyme substrate system obeying sim ple Michaelis and Menten mechanism the rate of product formation when the substrate concentration is very large has the limiting value 0 02 mol dm At a sub strate concentration of 250 mg dm the rate is half this value The value of K K in dm kg assuming that K K is

A 5 3 x 10 10 M B 5 3 x 10 8 M 10 D 5 3 x 10 11 M 4 Let the solubilities of AgCl in pure water 0 01 M CaCl2 0 01 M NaCl 0 05 M AgNO3 be S1 S2 S3 S4 respectively What is the correct order of these quantities Neglect any complexation A S1 S4 S3 S2 B S1 S2 S3 S4 C S1 S3 S2 S4 D S4 S2 S3 S1 fo NO will be represented by which concentration term Assur 5 3 10 7 M x

TYPE III VOLUME VOLUME RELATIO For complete combustion of 1 12 L of butane C H the produced volume of H O C IP STP will be 2 g 1 C4H10 g 1 12L Volum 13 2 13 202 g Volume of H O at STP 5 x 1 12 5 6 L 2 STR 4 A 4CO2 g A AO T 5 5H O g 2

Which is incorrect in reversible process Question Type Single Correct Type 1 2 3 Work on expansion is maximum Driving force is slightly greater than opposing force System and surrounding are always in thermal equilibrium with each other 4 Total entropy change is positive

Select the correct matching List I Metal ions 1 XeF4 2 XeF6 3 XeO3 4 XeOF 2 1 1 D 2 C 3 A 4 B 1 A 2 B 3 C 4 D 3 1 B 2 A 3 C 4 D List II Magnetic moment BM A Pyramidal B T shape C Distorted octahedral D Square planar 4 1 C2 A 3 A 4 B The no of bonds in the compound P4010 is AAJ KA TOPPER

Na CO can be manufactured by solvay process but K CO3 cannot be prepared because 1 K CO is more soluble 2 K CO is less soluble 3 KHCO3 is more soluble than NaHCO 4 KHCO is less soluble than NaHCO

4 n 2 to n 1 The increasing order of the rate of HCN addition to compound A D is A HCHO B CH COCH C PhCOCH D PhCOPh 2 D B C A 3 D C B A 4 C D B A 1 A B C D CH NH 0 12 mole pK 3 3 is added to 0 08 moles of HCl and the solution is diluted to

A near UV photon of 300nm is absorbed by a gas and then re emitted as two photons One photon is red with wavelength 760nm Hence wavelength of the second photon is A B kipped C D 1060 nm 496 nm 300 nm 215 nm G

Which is an incorrect statement 1 Diamond is unaffected by conc acids but graphite reacts with hot conc HNO3 forming mellit acid C6 COOH 2 CO is toxic because it forms a complex with hemoglobin in the blood 3 CO carbon suboxide is a foul smelling gas 4 COCI is called tear gas Which test is used to distinguish aldehydes from Ketones

9 How many number of molecules and atoms respectively are present in 2 8 litres of a diatomic gas at STP b a 6 023 x 10 75 x 10 6 023 x 10 15 x 1022 c 7 5 x 102 15 x 10 2 d 15 x 102 7 5 x 10 a b c d H 59 H

3 PbO is added to an acidified solution of KMnO4 4 Na O is added to boiling water At certain Hill station pure water boils at 99 72 C If K for water is 0 513 Ckgmol The boilin point of 0 69 m solution of urea will be 1 100 074 C 2 103 C 3 100 359 C 4 Un predictabl

At 25 C the enthalpy change for the ionization of trichloroacetic acid is 6 3kJ mol and the entropy change is 0 0084 kJmol K Then pKa of trichloro acetic acid is 1 1 74 3 0 66 2 2 52 4 4 72

Match the following Column I A B C D 100 ml of 0 2 M AICI3 solution 400 ml of 0 1 M HCl solution 50 ml of 0 4 M KCl 50 ml H O 30 ml of 0 2 M K SO4 70 ml H O 200 ml 24 5 w v H SO4 p q r s Column II Total concentration of cation s 0 12 M SO42 1 0 06 M SO42 1 2 5 M CI 0 2 M

3 B B B Tribomo acid Which of the following sequences molecules 1 CIO OF OCL H O 2 OF H O OCI CIO 3 OCI CIO H O OF 4 H O OF OCI CIO CH C CHCOCH can be oxidized to CH C CHCOOH by 4 No reaction takes place represent the correct increasing order of bond angles in the giv

The sum of number of a bonds and bonds present in P4010 is Answer 20 20 01 01 2 04 04 05 05 06 06 07 07 08 08 6 9 21 26 31 36 22 27 32 37

Two radioactive nuclides P and Q have half lives of 100 min and 60 min respectively After how much time the ratio of nuclides of P Q will be 2 1 if initially they are in the ratio of 4 3 In2 0 7 In1 5 0 4 O 85 7 min O 7 sec O 0 7 min 7 min

Mark Tor Review Which of the following helps in flocculation of lyophobic colloids By adding opposite charge electrolyte Electrophoresis 01 2 hr Continuous dialysis All of these

For the first order reaction Tav average life T and T 31 fent enfeffer T siten sar T 50 in the increasing order are 1 T50 Tv T25 2 T T Tav 50 545 3 T T T 50 4 T T T M 1 T0 Tv T av 2 T50 T75 TAV 3 T To T DV 4 T T T75

SolveLancer Test The rate of diffusion of two gases X Y are in the ratio of 1 8 If the ratio of their mass is present in the mixture is 8 9 Calculate the ratio of their moles SolveLancer Test 3 O a O b O C 11914NITAIW a b 6 d A

3 w v aqueous solution of glucose would be isotonic with A 1 w v aqueous solution of urea B 1 w v aqueous solution of Benzoic acid 1 w v aqueous solution of CaCl D 1 w v aqueous solution of NaCl

5 Mechanism of a hypothetical reaction X 2XY is given below i X X X fast ii X Y XY Y slow 2 iii X Y XY fast The overall order of the reaction will be 1 2 3 1 5 2 0 4 1 Y 2

Electron arrangements H 25 19 Na Mg Be K 20 Ca BID IVE 21 Sc Ti 23 V xx xx C 24 VID xx Periodic Table of the Elements VI Number the Symbol Name 28 10 29 ces 7 12 10 20 13 13 HA A B Al 16 14 IVA 4A C Si 15 VA Z P 16 16 VIA OS T

3 3 33 10 9 4 3 33 10 10 23 To a 200 ml of 0 1 M weak acid HA solution 90 ml of 0 1 M 23 solution of NaOH be added Now what volume of 0 1 M NaOH be added into above solution so that pH of resulting solution be 5 K HA 105 1 2 ml 2 20 ml 3 10 ml 4 15 ml 3 3 33 x 10 9 4 3 33 10 10 HA 0 1M 200 ml NaOH 90 ml faca fara M 1 fan 0 1 M Nafa facra ap afruit facer a pH 5 K HA 10 1 2 ml 2 20 ml 3 10 ml 4 15 ml

Question No 33 Chem Section A This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and 4 out of Select the interhalogen of square pyramidal shape among the given options O CIF3 O IF O BrFs a ICI

4 K changes significantly with pressure 9 At 400 K K 6 for the reaction 1 2N g 3 2H 9 NH g What is K for the reaction 2NH g N g 3H g 1 0 028 2 6 3 0 036 4 0 17 C 9 Chemical Equilibrium y frutan int 19 400 K afferen 1 2N g 3 2H g NH g fuff 2NH g N g 3H g 1 0 028 2 6 3 0 036 4 0 17

Question No 28 Consider the process of zone refining Top side Metal rod Heater Bottom side Heater is sliding from top side to bottom side Identify the incorrect statement O The bottom side of the metal rod is rich in impurities O Metals like Si Ge and Ga of low purity are purified by this method This process is based upon fractional crystallization as the impurity prefers to stay in the melt O This method is based on the principle that the impurities are more soluble in the melt than in solid state of the metal

x 10 5 4 1 6 x 10 6 25 Which of the following plot represent first order reaction r rate at time t and r is the initial rate a c 3 rate 60 10 k Slope 2 303 b 1 a b d 2 a c d 2 b time Concentration d in r 11 2 Concentration In ro time