Physical Chemistry Questions

Q17 Identify which of the following statement is True O A In the case of an ideal gas isothermal irreversible work of expansion is greater than that of reversible work of expansion O B All the natural processes are irreversible O c Density is an extensive property O D If in a process H H final initial the process must be exothermic

The resistances of CH3COOCI3 solutions of various concentrations measured at 25 C using a conductivity cell with a cell constant of 0 2063 cm 1 are given as follows C mol L 0 0005 0 001 R ohm 3314 1669 a limit molar conductivity b dissociation constant 0 005 342 1 0 010 174 1 0 020 89 08 0 050 37 14

The most convenient method to protect the botto of ship made of iron is 1 Coating it with red lead oxide 2 White tin plating 3 Connecting it with Mg block 4 Connecting it with Pb block

Which of the following statement is 1 point TRUE O O O Particle following F D static are distinguishable Particle following F D static are indistinguishable Particle following B E static are distinguishable Particle following M B static are indistinguishable

15 Photoelectric emission is observed from a surface when lights of frequency n and no incident If the ratio of maximum kinetic energy in two cases is K 1 then Assume n n threshold frequency is 1 K 1 Kn n X 2 3 Kn n 1 K K 1 Kn n

c Simple cubic d None of these 8 Polonium crystallizes in a simple cubic structure The edge of the unit cell is 0 236 nm What the radius of the polonium atom a 0 144 nm b 0 156 nm c 0 118 nm d 0 102 nm

1 The periodic table consists of 18 groups An isotope of copper on bombardment with protons undergoes a nuclear reaction yielding element X as shown below To which group element X belongs in the periodic table 29 Cu63 H 6n He a 2 H XA 01

A 2 0 L flask initially containing one mole of each CO and H O was sealed and heated to 700 K where the following equilibrium was established CO g H O CO 8 H 8 Kc 9 Now the flask was connected to another flask containing some pure CO g at same temperature and pressure by means of a narrow tube of negligible volume When the equilibrium was restored moles of CO was found to be double of its mole at first equilibrium Determine volume of CO g flask in litres

220 Why lithium metal reacts rigorously with water and catches fire O A Due to the high reduction potential of lithium O B Due to the high lattice energy of lithium O c Due to the high oxidation potential of lithium O D Due to the high extend of hydration energy

AH olubility of a solute in a solvent say H O is dependent on temperature as given by S Ae where AH is heat of reaction olute H O solution AH tx For a given solution variation of log S with temperature is shown graphically Hence solute ogs A CuSO4 5H O B NaCl C Sucrose 1 T D CaO Correct Answer

c 8 14 9 d 8 4 2 20 What would be the effective number of atoms per unit cell in end centered cubic unit cel this type of unit cell exist in nature b 2 a 1 d 4 c 3 21 In the body centered cubic unit cell and simple cubic unit coll

0 A mixture of 3 mol CH3OH and 4 mol C2H5OH is mixed to prepare an ideal solution The tota vapour pressure of solution is Vapour pressure of CH3OH 20 mmHg and Vapour pressure of C2H5OH 30 mmHg 1 17 14 mmHg 3 30 mmHq 2 25 71 mmHg 4 50 mmHg

Consider an element A crystallizing in simple cubic face centered cubic and body centered cubic lattice If the radius of an atom of A is r then which of the following statements is are correct assume no change of radius during formation of different crystals A Shortest distance between two non touching spheres in simple cubic unit cell is B Shortest distance between two non touching spheres in FCC unit cell and SC unit cell is same C Shortest distance between two non touching spheres in BCC that in FCC unit cell D Void space in BCC unit cell is greater than that in FCC unit cell 12 17 s th

a 1 6 b 4 12 c 2 8 d 2 6 33 What are the number of atoms per unit cell and the number of nearest neighbours in a face centered cubic structure a 4 8 b 2 8 c 2 6 d 4 12 34 What are the number of atoms per unit cell and the number of nearest neighbours in a body

a 0 32 b 0 48 c 0 68 d 0 74 25 The fraction of volume occupied by atoms in a face centered cubic unit cell is a 0 32 b 0 48 c 0 68 d 0 74 26 Which of the following crystal lattice has the minimum empty space cell is

1 mol of monoatomic ideal gas perform the following operation P C A B V Select the correct statement or relation 1 A to B is endothermic process 2 B to C is exothermic process 3 C to A is exothermic process 4 Work done in cyclic process ABCA is zero

a Calculate the time for which a current of 0 65 A be passed through molten magnesium chloride to get 5 g of magnesium Given Mm Mg 24 25 g mol Draw a labelled schematic graph of a conductometric titration between a weak acid and a strong base

30 Which set of quantum numbers is not consistent with theory 1 n 2 1 1 m 0 s 1 2 1 2 n 4 1 3 m 2 s 2 3 n 3 1 2 m 3 s 1 2 1 3 m 3 s

Which of the following statement is true for th electrochemical Daniel cell 1 Electrons flows from copper electrode to zinc electrode 2 Currents flows from zinc electrode to electrode copper 3 Cations moves towards the zinc electrode 4 All of the above

A metal oxide has the formula Z O3 reduced by hydrogen to give free metal and water 0 1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction The atomic weight of the metal is

The decomposition of gas at an initial pressure of 600mm of Hg was studied in a close vessel at a certain temperature The gas was found to be 50 decomposed in 30 minutes and 75 decomposed in 90 minutes Show that the reaction is of second orde and calculate the rate constant 3 marks

SolveLancer Test For FeSO4 6H O which statement is correct related to moles SolveLancer Test a 10 Mole of Fe Mole of O b 5 x Mole of Fe Mole of O c 9 x Mole of Fe Mole of 0 2 d Mole of Fe 5 x Mole of O

The ratio of masses of an element A attached with the fixed mass of another element B in their two compounds is 2 3 If 48 mass of A is attached with 24 mass of B in first compound then what mass of A is attached with the 12 mass of B in the second compound 1 72 2 36 3 24

4 Which mixture of the solutions will lead to the formation of negatively charged colloidal AgI I sol a 50 mL of 0 1 M AgNO3 50 mL of 0 1 M KI b 50 mL of 1 M AgNO3 50 mL of 1 5 M KI c 50 mL of 1 M AgNO3 50 mL of 2 M KI AgNO 50 mL of 1 5 M KI

31 0 24 g of a volatile gas upon vaporisation gives 45 mL vapour at NTP What will be the vapour density of the substance Density of H 0 089 a 95 93 c 95 39 1996 b 59 93 d 5 993

andard electrode potential data are useful for understanding the suitability of an oxidant in a redox reaction Some half cell reactions and their standard potential are give elow InO aq 8H aq 5e Mn aq 4H 0 1 E 1 5 V 0 aq 14H aq 6e 2Cr aq 7H O 1 E 1 38 V 3 aq eFe2 aq E 0 77 V 12 g 2e2Cl aq E 1 40 V entify the correct statement s regarding the quantitative estimation of aqueous ferrous nitrate in solution 1 MnO can be used in aqueous H SO4 2 Cr 0 can be used in aqueous H SO4 MnO can be used in aqueous HCI 3 Cr O can be used in aqueous HCI

on is moving in 3rd orbit of Li 2 and its separation energy is y The separation energy of an electron moving in 2nd orbit of Het is 13 62 2 1 4y 9 2 9 y 3 9 4 y

23 With increasing principal quantum number the energy difference between adjacent energy levels in atoms 1 Decreases 2 Increases 3 Remains constant 4 Decreases for low 7 and increases for high 7

In quantitative analysis of second group in laboratory H S gas is passed in acidic medium for precipitation When Cu and Cd react with 2 KCN then for product true statement is a K Cu CN 4 more soluble less stable b K Cd CN 4 c K3 Cu CN less stable d K Cd CN 3 more stable 2000

C H OH g CH CHO g H g AH 60 kJ If the molar ratio of C H g to CH CHO g is x y in the above process and 52 kJ is absorbed when 1 mol of C H5OH dissociate according to above reaction Then 1 0 25 3 4 X C H g H O g AH 50 kJ y is 2 2 4 8

33 The electron identified by quantum numbers n and I i n 4 1 ii n 4 1 0 iii n 3 1 0 iv n 3 1 1 Can be placed in order of increasing energy 1 iii iv i ii 2 iii iv ii i 3 i iii ii iv 4 iii i iv ii

0 635 x 10 kg of a substance of molar mass dissolved in 3 190 10 kg mol 1 was 30 5 x 10 kg of a solvent If the depression in the freezing point is 0 62 C find the molal depression constant of the solvent 2 marks

mixture of KOH 56 and K CO3 138 is dissolved in water and separated into two equal parts by volume One part required 50 mL 0 1 M H SO to reach the phenolphthalein end point while the other par required 75 ml of the same acid to reach the methyl oragane end point The mass percentage of K CO i the mixture is A 35 5 B 71 D 64 5

What is the dimensionality of an NMR spectrum resulting from a pulse program with 3 evolution periods and one detectionperiod And how many Fourier transformations of the time domains are necessary to obtain the frequency domains

Pick out terms from the given pool of words and label the given diagram Burning of candle Condensation Melting of wax Boiling Evaporation Water droplet Contraction Melting Burning of Candles

In order to increase the volume of a gas by 10 the pressure of the gas should be A Decreased by 10 Wrong Answer B Decreased by 9 09 Correct Answer C Increased by 10 R Increased by 1

sp 5 A saturated solution of MX is prepared K of MX is a 10 b If 10 7 mol of MNO3 are added in 1 L of this solution conductivity of this solution is 55 10 7 Sm A 6 10 S m mol M A 8 10 NO 7 10

2 49 L of CO2 is passed into excess of lime water solution at 1 bar and 27 C The precipitate is filtered and dried and dissolved in 1 L of 0 2 M HCI solution and heated slightly What is the osmotic pressure of the resulting solution at 27 C R 0 083 L bar K 1 mol Assuming all CO in reaction 1 has been converted into ppt and all CO from reaction 2 escaped into atmoshere

2 60 Sulphide ion in alkaline solution reacts with solid sulphur to form polysulphide ions having formula S2 S3 S etc if K 12 for S S S2 and K 132 for 2S S S3 K3 for S S S ort Telu all Irpingt 10 3

ugh pressure 5 The following are some statements regarding dissociation of lime stone according to the equation CaCO3 s CaO s CO2 g AH 110 kJ The reaction is carried in a closed vessel A The pressure of CO increases when temperature is increased B The pressure of CO increases when temperature is decreased C The pressure of CO increases when amount of CaCO is decreased The incorrect statements are 1 A and B 2 B and C 3 A and C 4 All A B C

Chemical formula of Aluminium Sulphate is 1 2 Al2 2 SO4 3 3 Al SO 8gr of Mg contain 1 0 3 2 Latin word for water is 1 3 3 hydro 2 OXY 3 Valency of carbon is 1 1 2 2 2 3 3 The Valency of copper in Cu O is moles 2 4 helios 4 4 Al SO4 3 4 0 2 4 none Al

12 25 3 g of sodium carbonate Na CO3 is dissolved in enough water to make 250 mL of solution If sodium carbonate dissociates completely molar concentration of sodium ion Nat and carbonate ions CO are respectively Molar mass of Na CO3 106 g mol a 0 955 M and 1 910 M b 1 910 M and 0 955 M c 1 90 M and 1 910 M ar 0177 M and 0477 M Prelims 2010

The density of dry air at p 1 1 bar and T 300 K is 1 21 kg m 3 Assuming that it consists entirely of N and O and using the idea gas law determine the amount of each gas in moles and their mole fractions in a volume of 1 m

True or false If false explain clearly in complete sentences and with all arguments why is it false 1 The fifth excited energy level of a particle in a perfect cube a b c is not degenerate

33 20 mL of 0 2 M NaOH is added to 50 ml of 0 2 M acetic acid to give 70 ml of the solution Calculate the additional volume in mL of 0 2 M NaOH required to make the pH of the solution 4 74 The ionization constant of acetic acid is 1 8 x 105 Use log 1 8 0 26

3 Conductive cell has resistance 2202 when fill by 0 1m CH3COONa 7 392 when fill by 0 1M CH3COONa 0 2M HCI and 1 692 when using 0 1M NaCl solution and ANaCl 126 give a Cell constant

3 For a reaction A B C the experimental rate law is found to be R K A B 2 Find the rate of the reaction when A 0 5 M B 0 1 M and k 0 03 a 4 74 x 10 2 L mol s b 5 38 x 10 2 L mol 1 2 s 1 c 5 748 x 10 2 L mol s d 4 86 x 10 2 L mol 1 2 s 1

8 9 Oxygen molecule formula is 1 20 2 0 3 0 4 0 When the particles of a substance contain only one type of atoms that substanc is called element 3 compound 4 atom 1 Molecule 2 Symbol of Argon is 1 Ag 2 Ar 3 An 4 A

When O3 gas and SO gas are mixed in xy molar ratio the average vapour density of mixture is 29 6 then the average molecular mass of mixture which is prepared by mixing O3 and SO2 gases in yx ratio is Atomic mass O 16 S 32 A 26 4 B 52 8 C 56 D 50 8

Two students are arguing about whose experiment went best Student A mentions the GC had a ratio of 95 and 5 starting material and the IR was a 90 match Student B saw that the IR had 98 on the match and the GC was 94 6 product to starting material Who had the better more pure product Student A They both had the exact same result Student B Neither bhad a better result