Physical Chemistry Questions

is the final temperature What volume of O at 2 00 atm pressure and 27 C are required to burn 10 0 g of heptane C H 6 16 C H16 1102 7CO 8H 0 The mass of 525 cm of a gaseous compound at 28 C

Select the correct statement s Select answers A In general more the ionization energy more will be the electronegativity B Electronegativity increases means metallic character increases C In general lower the ionization energy higher will be the reducing property D Cl has higher electron affinity than F

8 g of helium and 4 g of hydrogen gas are present in a closed vessel at 127 C If pressure exerted by the gas mixture is 4 1 atm then the volume of the container is NCERT Pg 145 1 32 L 3 40 L 2 16 L 4 24 L

The solubility of a specific non volatile salt is 4 g in 100g of water at 25 C If 2 0 g8 4 0 6 0 g of the salt g and added of 100 g of water at 25 C in system X Y and 2 The vapour pressure would be in the order A X Y Z C Z X Y B X Y Z D X Y Z

the walls greater 7 Calculate the pressure of 1 x 1022 molecules of sulphur dioxide in pascal when enclosed in a vessel of 2 5 dm capacity at 300 K at B Calculate the pressure exerted by 56 g of an ideal 1 1 onglosed in a vessel

D A gas cylinder having a volume of 25 0 L contains a mixture of butane CH CH CH and isobutane CH CH in the ratio of 3 1 by moles If the pressure inside the cylinder is 6 78 x 106 Pa and the temperature is 298 K calculate the number of molecules of each gas assuming ideal behaviour 1 atm 101325 Pa 25 0

A manometer attached to 36 litre flask contains some inert gas ammonium carbamate NH COONH4 s having no difference in mercury level initially as shown NH COONH s decomposed completely on heating according to reaction NH COONH s 2NH g CO g P 1atm NH COONH s Hg 0 If same amount of NH COONH s is decomposed completely in separate container and produced NH3 g required 500 ml of neutralisation During the process temperature remains at 300K R 0 08 atm litre mole K 1atm 76 cm of Hg The difference in height of Hg column in mm after complete decomposition of NH COONH s is 2M 3 H PO solution for complete

12 He and Ar are monoatomic gases and their atomic weights are 4 and 40 respectively Under simila conditions He will diffuse through semi permeabl membrane 1 3 16 times as fast as Ar 2 7 32 times as fast as Ar 3 1 58 times as fast as Ar

153 Consider the following electron addition process AH202 i 0 AH 0 AH3S AHS AH4 ii S AH3 S iii P P p Then which of the following statement is incorrect regarding given informati a AH5 is less negative than AH 3 and AH b AH is less negative than AH 3 AH 2 is more positive than AH 4 d None of these AH6

In a H like species there are two energy levels A and B above the ground state having principal quantum numbers of n and no respectively A sample of this H like species has all atoms ions in excited levels A or B only and none in any other energy level Energy of level B is greater than that of level A and a total of 15 different lines are emitted from this sample on returning to ground state out of which 6 lines are emitted due to electronic transitions between the levels n and n only Also energy difference between levels n and Eng En 4 53 eV n Calculate minimum wavelength among all transitions 0 4 3RH 9 8RH

5 Which of the following is the correct value of pH for solution obtained by adding 4 g of NaOH to 1 L of solution of a buffer containing 60 g of acetic acid and 1 mol of sodium acetate K of acetic acid 0 000018 Choose the correct choice choices A log 0 18 10 4 log C log 0 018 x 10 7 log No 25 nc An B log 0 018 x 10 5 log 11 D 4 83

A fatty acid was spread on the surface of water in a Langmuir film balance at 150C The following data were obtained Area cm2 microg 1 5 7 28 2 507 1070 2200 11100 Surface pressure mN m 1 30 0 3 0 2 0 1 0 05 0 01 Estimate a the molar mass of the fatty acid and b the molecular cross section area

01 9 An air bubble has a radius of 0 50 cm at the bottom of the water tank where the temperature is 280 K and the pressure is 280 kPa When the bubble rises to the surface the temperature changes to 300 K and pressure is 100 kPa Calculate the radius of the bubble at the surface

Calculate A H in units of kJ mol for the following reaction Ga O3 s 3 CO g 2 Ga s 3 CO g Use the following two reactions 2 Ga s 3 2 O g CO g O g Ga O3 s CO g AH 1077 8 kJ mol AH 282 7 kJ mol L

3 For the equilibrium AB the variation of the rate of the forward a and reverse b reaction with time is given by A C Rate of reaction ate of reaction a b Time b equilibrium equilibrium B D Rate of reaction Vorrat je dje 6 Lime equilibrium equilibrium

3 The following table shows the melting points T C of naphthalene at each weights g of naphthalene 128 g mol and biphenyl 169 g mol Calculate the heat of fusion of naphthalene kJ mol 0 C 273 K R 0 0821 L atm mol K 8 31 J mol K 10 pts Naphthalene g 5 00 5 00 5 00 5 00 Biphenyl g Melting point T C 0 00 80 2 0 73 75 2 1 65 69 7 2 83 63 7

1 10 points There are 4 8778 x 1023 atoms in a metallic alloy sample containing only copper and silver If the sample has a mass of 82 0653 g find the mass percentage of copper in the alloy to 3 significant figures

h the column I with column II 1 He CL 3X Xe ver 1 2 3 A A A List 2 A Highest electron gain enthalpy B Most electropositive element C Vander waal s radius D Highest ionization energy B B B C C C

A monoatomic ideal gas undergoes the shown cyclic process in which path of the process 2 3 is a semicircle If 2 mol of gas is taken find Maximum temperature in the cyclic process is R V P 2Po P P 2 7 V 1 3 2V

16 Consider the equilibrium obtained by electrically connecting zinc amalgam Zn Hg and HgO electrodes in mercury cell Zn Hg HgO s ZnO s Hg 1 Under this equilibrium what is the relation between the potential of the Zn Hg and HgO electrodes measured against the standard hydrogen electrode a Zn Hg electrode potential is equal to HgO electrode potential b Zn Hg electrode potential is more than HgO electrode potential c HgO electrode potential is more than Zn Hg electrode d Cell voltage at above said equilibrium is 1 35 V e Both c and d

Given are E values for some half reactions 12 2e 21 E 0 54 V MnO 8H 5e Mn 4H O E 1 52 V Fee Fe2 E 0 77 V E 0 1 V Sn 2e Sn The strongest reducant and oxidant respectively are Sn MnO4 MnO4 Sn 12 Fe

Task 6 1d Suppose you make a data set by measuring the pressure P at different x and x in an experiment for a binary mixture Suggest a procedure to estimate an optimum value for the coefficient A in the activity model by minimizing the error between calculated pressure using models and measured pressure

Match the column I Elements with column II AEH List 1 1 Most reactive non metal 2 Most reactive metal 3 Least reactive element 4 Metal forming binary halide Answer 1 2 A A A EH AEGH List 2 B B A B C D AEH 419 AEH 1681 AH 738 AEH 2372 AEH AEGH 3051 48 AEH AEGH 3374 AEH 1451 ALEH 5251 328 AEGH 40 AEGH 48 C C

5 The stopcock connecting two bulbs of volume 5 litres and 10 litres containing an ideal gas at 9 atm and 6 atm respectively is opened What is the final pressure in the two bulbs if the temperature remians constant 1 15 atm 3 12 atm 2 7 atm 4 21 atm

7 Match the type of interaction in column A with the distance dependence of their interaction energy in column B A i ion ion ii Dipole dipole iii Londondispersion B a b c d 7 7 7 2 A i a iii C C i b ii d iii c B i a ii b iii d D i a ii c iii d

0 0755 g of selenium vapours occupying a volume of 114 2 mL at 973 K exerts pressure atm For the reaction Se g 3 Se g Degree of dissociation of Se 0 59 Which of the following statement s is are correct regarding above statemen 185 760 A Value of K is 0 1687 C Value of K 0 1687 0 0821x973 B Value of K 0 2645 10 4 0 0821x973 973 D Value of K

Trial a b C Vol of HCI mL Initial mass g 3 00 3 00 3 00 99 43 99 54 99 48 Mass at endpoint g 104 12 104 23 104 16 NaOH was titrated with 0 1035 M HCI by a scientist The NaOH solution was used in the amount of 15 mL for all trials The scientist wants to know the average concentration and molarity of the NaOH solution across all trials

The electronic configuration of some neutral atoms are given below A 1s 2s B 1s 2s 2p C 1s 2s 2p5 In which of these electronic configuration would you expect to have highest ii IE 3 C B 1 C A i IE 2 B A D 1s 2s 2p 3s 4 B D

A patient received 6 0 gg of NaClNaCl in 8 hours You may want to reference Page Section 9 4 while completing this problem How many milliliters of a 0 60 m v NaCINaCl saline solution were delivered Express the volume in milliliters to two significant figures

About 8 0 x 106 tons of urea NH2 2CO are used annually as a fertilizer The urea is prepared at 200 C under high pressure conditions from carbon dioxide and ammonia the products are urea and steam Calculate the volume of ammonia in liters measured at 147 atm needed to prepare 3 87 tons of urea Assume ideal behavior Find the answer in scientific notation

Dipole induced dipole interactions are present in which of the following pairs NEET 2013 1 Cl and CCI 2 HCI and He atoms 3 SiF and He atoms 4 H O and alcohol

c An underground pipeline was found to have different intensity of corrosions because it s some part was buried in sand and other part was buried in clay discuss type of corrosion along with its mechanism in the above set condition 12 51

Only One Correct Answer A B C D Glucose on complete reduction with HI and red phosphorus finally gives n hexane It reacts with acetic anhydride and gives hexaacetate derivatives Glucose combines with hydroxyl amine to form a monoxime Mild oxidation of glucose with Br water gives gluconic acid

Arrange the following reactions in order of increasing the value of the reaction entropy A Srxn under the standard state from lowest to highest 1 Cl g F2 g 2 FCI g 2 NH4 2Cr O7 s Cr O3 s 4H O l N2 g 3 NH4NO3 s N O g 2 H O liq 0a1 2 3 b 3 1 2 0c2 301 d 2 1 3 Oel 3 2 Of 3 2 1

Equal masses of H O and methane have been taken in a container of volume V at temperature 27 C in identical conditions The ratio of the volumes of gases H 0 methane would be AIPMT 2014 2 2 2 16 8 1 1 8 16 1 3 16 1 2 LA

This section contains I Matrix Match type question which has 2 Columns Column I and Column II Column I has four entries A B C and D Column has four entries P Q R and S Match the entries in Column I with the entries in Column II Each entry in Column I May Match with one or more entries in Column II Match the Columns Column 1 A COMMOn sait Column 11 P Neutral salt Salt of 0 chloride family R Basic salt Salt obtained by Salt of D recrystallisation of sodium S sodium carbonate family 8 Baking soda C Ferric chloride One Mare Correct Answer s For Each Option

at Two flasks A and B have equal volumes Flask A contains hydrogen at 300 K while flask B has same mass of CH at 600 K i Which flask contains larger number molecules of ii In which flask is the pressure greater and how many times iii In which flask the molecules move faster iv In which flask is the number of collisions with the walls greater

Which of the following is true about Michaelis Menten kinetics O 1 point Km the Michaelis constant is defined as that concentration of substrate at which enzyme is working at maximum velocity It describes single substrate enzymes Km the Michaelis constant is O defined as the dissociation constant of the enzyme substrate complex It assumes covalent binding occurs between enzyme and substrate

In electrolytic cell external source of voltage is used to bring about a chemical change One of the simplest electrolytic cell consists of two copper strips dipping in an aqueous solution of copper sulphate If a DC voltage is supplied to the two electrodes then copper ions are deposited on the cathode While at anode Cu is converted to Cu aq At cathode Cu aq Cu s Cu s Cu aq At anode Cu 20 g strip of impure copper and 10 g strip of pure copper are dipped in 2 L 0 1 M CuSO4 aq solution 100 A current is passed for 241 25 s through the solution to cause electrolysis Efficiency of current is 80 Answer the following question based on above stem Cu 63 5 g mol Q What is the total weight of pure copper at cathode after the electrolysis

5pts Given that Analyte X has a Kd 1250 H 0 05 and solubility in water 25 mg L and is present in water at 12 mg L sediment at 300 mg kg and air at lug L Determine the compartment most likely to a gain X and b lose X

How many gram of iron pyrite FeS should be burnt completely to produce sufficeint SO gas needed to decolourise completely 100 ml 0 12 M KMnO4 solution is acidic medium Fe 56 0 1 2 gm 1 8 gm 0 9 gm 00 36 gm

1 The work function of sodium metal is 4 41 x 10 19 J If photons of wavelength 300mm are incident on the metal the kinetics energy of the ejected electrons will be h 6 63 x 10 34 Js c 3 10 m s 10 J

Two flasks of capacity 1 L and 2 L contain gases A and B respectively at same temperature If density of A is 2 5 g L and that of B is 5 g L and the molar mass of A is twice of that of B then the ratio of pressure exerted by gases A B is NCERT Pg 146 1 1 2 2 1 4 1 2

Calculate the density of matter at the center of a 208Pb nucleus How does it compare to the Pb density of 11 34 g cm3 b List the forces of nature in the order of their strength Give their range and exchange particles

Two isotopes X and Y of atomic mass 10 and 20 respectively are mixed in equal amo mass After 30 days their mass ratio if found to be 4 1 If isotope X has half life of 10 day is the half life of Y in days

A X Y3 B X Y3 C X Y D X Y4 The edge length of a face centred cubic cell of an ionic substance is 508 pm If the radius of the cation is 110 pm the radius of the anion is AIEEE 10 A 144 pm B 288 pm REVISION ASSIGNMENT 01 SOLID STATE 7 C 398 pm D 618 pm 1 5

The radial wave function for 1s orbit of a single electron species is given by Ti40 Ke 2 where o 2Zr and K is constant ao radius of Ist Bohr orbit in H atom 1 52 9 pm n is principal quantum number Calculate most probable dis tance of 1 s electron in Be ion Give answer in the form of most probable distance in pm

If the slope of Z versus p curve is constant slope atm at a partic P 492 6 300 K and at very high pressure then diameter of the molecules B 50 C 2 5A D 1 25 temperature A 7 5A

A sample consisting of 3 mol of ideal gas molecules with Cp m 20 8 J K mol is initially at 240 kPa and 325 K It undergoes reversible adiabatic expansion until its pressure reaches 150 kPa Calculate i the final volume and temperature ii q iii w and iv AU

conc 20 days Time R P Follows the above conversion graph and this first order reaction occurring at 27 C then 10 molecules are in activated state Find the maximum rate constant A 3 46 10 day C 10 day B 3 46 10 day X D can t be determined