Physical Chemistry Questions

During the electrolysis of sodium chloride in Castner Kellner cell the product obtained at cathode and anode respectively are O Na Cl O H Cl2 O Na amalgam Cl

4 H Ni 2H Ni The following facts are available 2X Y 2Y X 2W Y no reaction 2Z X 2X Z Which of the following statements is correct 1 Eo 42 E 3 Eo 141 Do W W E y Y E x x E z Y E w W E y Y Ex x E z 2 Y Y X X2 2 22 W W E y Y E x x E Y X X2 2 22 Co Fo 2 22 Fo 5

C Haemoglobin blood and gold sol are negative charge colloids D Casein act as emulsifier for milk Given H 0 KMnO H SO MnSO H O O K SO which is correct statement A Number of gm equivalent of H O and KMnO reacts in the ratio of 5 2 B Number of moles of MnSO and O produced in the ratio of 5 2 C Equivalent mass of H SO is 29 4 D 100 ml 2 27 V H O reacts completely with 160 ml 0 5M KMnO in given reactic Space for Rough Work

53 pl3 Q a t 1000 hrs QR b t 2 10 min Number of nuclei of Q and R respectively after 1000 hr if we start with 2 mo N 6 10 A 6 1023 6 10 3 B 6 1022 6 10 3 C 2 1020 6 1023 D 1020 6 10 3

The percentage of Fe in 3 oxidation state in Fe0 9 O is A 78 B 90 C 10 D 22 If law of conservation of mass to hold true then 20 8 g of BaCl on reaction with 9 8 g of

10 moles of a active radio isotope M g are disintegrating at 300 K in a cylinder enclosed with a frictionless piston as given below A 12 4M g 2N g a particles Z 6 The half life of the radioactive sample is 69 3 hours The a particles emitted forms He g by trapping electrons in the cylinder As He g forms piston moves up against constant external pressure of 1 atm The work done by the gas in cal by the end of initial one hour is assume rate remains almost constant during this period Given R 2 Cal mol K In 2 0 693 Report your answer by dividing it by 30

Increasing the temperature O of 100 g of water through 100 C O O O Increasing the temperature of 1 g of water through 100 C Increasing the temperature of 500 g of water through 100 C Increasing the temperature of 10 g of water through 100 C

An aqueous solution of sucrose C12H22O11 having a concentration of 34 2 g l has an osmotic pressure of 2 38 atm at 17 C What should be the concentration of an aqueous solution of glucose C6H12O6 to be isotonic with this solution

c 275 1 pm d 322 5 pm 17 AB crystallises in a body centred cubic lattice with edge length a equal to 387 pm The distance between two oppositely charged ions in the lattice is 2010 Pre a 335 pm c 200 pm b 250 pm d 300 pm d 6 0 c 6 02 x 10 4 mol 25 The fraction of total volume o present in a simple cube is b a T 3 2 4 2 C 26 The appearance of colour halides is generally due to

For the reaction CO g O g CO g AH 67650 cal 2 at 25 C Calculate AH at 100 C given that the required molar heat capacities are as follows Cp CO g 6 97 cal C 1 Cp CO2 g 8 97 cal C 1 Cp 02 g 7 00 cal C 1 O 54 6 cal O 67650 4 cal O 67684 4 cal 67762 5 cal

Arrange pH of the given compounds is decreasing order 29 feptera anfory 01 b ufera che G hs econ d 3 a Phenol c Formic acid 1 a b c d 2 b a d c 3 c b d a 4 d c a b b Ethyl alcohol d Benzoic acid a f c hitties and Coo H 1 a b c d 2 badc 3 c b d a A d h Batch PCBZ 1 to 3

73 Given NO g O g NO g O g AH 198 9 kJ mol O g 3 2 0 g AH 142 3 kJ mol O g 20 g AH 495 0 kJ mol The enthalpy change AH for the following reaction is NO g 0 g NO g a 304 1 kJ mol b 304 1 kJ mol c 403 1 kJ mol d 403 1 kJ mol

50 How many grams of a non volatile solute having a molecular weight of 90 are to be dissolved in 97 5 g water in order to decrease the vapour pressure of water by 2 5 percent 1 25 3 12 5 2 18 4 9 61 Among the following that form a non ideal 67 68

52 If pressure is applied to the following equilibrium Liquid Vapour the boiling point of the liquid 1 Will increase 2 Will decrease 3 Will not change 4 Can not be predicted 3 Consider the following equilibrium Class XI Marcel Batc Chemical lonic Equilibe 52 G for all alle 1 za ich farg 1 2 3 M 4 53 A far

Consider the following statements regarding the solution of alkali metals and liquids ammonia 1 Rb dissolves in liquid ammonia giving deep blue colour II In concentrated solution the blue colour changes to bronze colour III Blue solutions are paramagnetic whereas bronze coloured solutions are diamagnetic The correct statement s is are II only I and II only II and III only I II and III

a b 1 08 10 13 c 1 0 x 10 d 6 0 x 10 131 The solubility of AgBrO 3 formula mass 236 is 0 0072 g in 1000 mL What is the K a 2 2 10 8 b 3 0 10 10 c 3 0 10 X d 9 3 10 10 132 The solubility of PbF formula mass 245 is 0 46 g L What is the solubility product R a 1 08 x 10 11

The standard enthalphy of formation of NH3 is 46 0 kJ mol 1 If the enthalpy of formation of H from its atoms is 436 kJ mol 1 and that of N is 712kJ mol 1 the average bond enthalpy of N H bond in NH3 is 1 1102 kJ mol 1 2 964 kJ mol 1 3 352 kJ mol 1 4 1056 kJ mol 1

100 The specific conductance of a saturated solution of silver bromide is k S cm The limiting ionic conductivity of Ag and Br ions are x and y respectively The solubility of silver bromide in gl is molar mass of AgBr 188 Ans kx1000 188 x y Sol Solublity Ac x y Solubility 1000 specific conductance Ac 1000 k x y x188 g L

The wave function for a hydrogen atom with its electron in the 2p state varies with direction as well as distance from the nucleus What is the probability of a 2p electron for which m 0 existing on the xy plane a 0 b 1 d Ao c 200

Find freezing point temperature in Kelvin of liquid if vapour pressure of solid liquid are given by following expression Inp 10 Where P vapour pressure of solid 3000 K T 2000 K T In p 5 3 P vapour pressure of liquid Note All terms are in SI unit Fill your answer as sum of digits excluding decimal places till you get the single digit answer

A coffee cup calorimeter initially contains 125 g of water at a temperature of 24 2 C 8 g of ammonium nitrate NH4NO3 also at 24 2 C is added to the water and the final temperature is 18 2 C What is the heat of solution of ammonium nitrate in kJ mol The specific heat capacity of the solution is 4 2 J C g a 33 51 kJ mol b 39 5 kJ mol c 32 2 kJ mol d 37 3 kJ mol

ru to its mole fraction in sol Case I A solute is a volatile solid or liquid On the basis of his study of a number of binary solutions of In a solution the vapor pressure of a component at a given temperature is equal to the mole fraction of that component in the solution multiplied by the vapor pressure of that component volatile components Raoult stated that in the pure state at the same temperature components A and B IX and XB are the mole fractions of the Let us consider a solution of two miscible volatile liquid two components A and B and p and pg are their vapor pressure in the pure state then according to Raoult s law PAA PA PB XB PB and

What volume of air at 1 atm and 273 K containing 21 of oxygen by volume is required to completely burn sulphur S present in 200 g of sample which contain 20 inert material which does not burn Sulphur burn according to the reaction S s O g SO g 8 A 23 52 litre B 320 litre C 112 litre D 533 33 litre

Which of the following expressions is the correct equilibrium constant expression for the equilibrium between ozone and oxygen 203 9 3 0 g Select one a P1021 P10312 X b P10315 P10215 Oc 3P023 2P032 d 3P032 2P 023 e P023 P032

Select the correct statements A Over a boundary surface value of probability density lyf is constant for a orbital B Probability of finding an electron is 100 in an orbital C Number of angular nodes are n 1 1 D For 1s orbital the probality density is maximum at the nucleus

123 Ksp of Zr3 PO4 4 in terms of solubility S is a 108 S7 b 4S d None of these 124 The solubility of electrolytes MX MX and MX is 1x 10 3 moles per litre Hence c 6912 S7

In which of the following reactions B H6 is not formed in the product BF3 NaH NaBH4 1 BF3 LIAIH4 450 K Na B4O HCI H O

4 Na Fe Cr Co 2 An electron in a hydrogen atom in its ground state absorbs energy equal to the ionisation energy of Li The wavelength of the emitted electron is 1 3 32 x 10 10 m 3 3 33 pm 2 1 17 4 None of these

reater eater aller 46 For the reaction AnB the concentration of A decreases from 0 06 to 0 03 mol L 1 and that of B rises from 0 to 0 06 mol L 1 at equilibrium The values of n and the equilibrium constant for the reaction respectively are a 2 and 0 12 b 2 and 1 2 c 3 and 0 12 d 3 and 1 2 ation of othyl methyl ketone with Cl 477 MI

If a cylinder of automobile engine has volume 821 cm and cylinder is full of air at atmospheric pressure 1 atm air having mole fraction of O 0 2 at 127 C then how much of C H g can undergo combustion by this amount of air 8 18 A 4x 104 mol B 4 x 10 mol C 8 x 10 mol D 2 x 10 4 mol

What volume of O measured at standard conditions will be formed by the action of 100 mL of 0 5 KMnO4 on hydrogen peroxide in an acidic solution A B D 0 12 litre 0 28 litre Correct Answer 0 56 litre 1 12 litre

For the reaction MnO 4HC1 MnCl Cl 2H O 8 7 gm MnO is dissolved in 500 m of HCl solution containing 7 3 gm HCl per litre Mn 55 A HCl is the limiting reagent 100 B MnO is the limiting reagent C 0 025 moles of MnCl will form D 560 ml Cl gas will liberate at 0 C and 1 atm

Determine enthalpy of formation for H O 1 using listed enthalpies of reaction N H 1 2H O 1 N g 4H O 1 A H 818kJ mol N H 1 O g N g 2H O 1 AH 622kJ mol H g 1 20 g H O 1 AH 285 kJ mol A 383 kJ mol B 187 kJ mol C 498 kJ mol D None of these

132 The solubility of PbF formula mass 245 is 0 46 g L What is the solubility product a 1 1x10 10 b 2 6 x 10 8 c 1 1 x 10 d 6 8 10 9 133 How many grams of MoC O formula mass 112 will dissolve in 15 of

TABLE II NO 1 2 00 1000 1002 1005 01 1023 1026 1028 02 1047 1050 1052 03 1072 1074 1076 04 1096 1099 1102 05 1122 1125 1127 06 1148 1151 1153 07 1175 1178 08 1202 1205 09 1230 1233 1236 1393 1396 10 1259 1262 1265 1268 1271 1274 11 1288 1291 1294 1297 1300 1303 12 1318 1321 1324 1327 1330 1334 13 1349 1352 1355 1358 1361 1365 14 1380 1384 1387 1390 15 1413 1416 1419 1422 1426 16 1445 1449 1452 1455 1459 1462 17 1479 1483 1486 1489 1493 1496 18 1514 1517 1521 1524 1528 1531 19 1549 1552 1556 1560 1563 1567 1429 20 1585 1589 21 1622 1626 22 1660 1663 23 1698 1702 24 1738 1742 3 4 5 1007 1009 1012 1033 1035 1030 1054 1057 1079 1081 1059 1084 1104 1107 1109 1130 1132 1135 1156 1159 1161 1180 1183 1186 1189 1208 1211 1213 1216 1239 1242 1245 25 1778 1782 26 1820 1824 27 1862 1866 28 1905 1910 29 1950 1954 1592 1596 1600 1603 1629 1633 1637 1641 1667 1671 1675 1679 1706 1710 1714 1718 1746 1750 1754 1758 1786 1791 1795 1799 1828 1832 1837 1841 1871 1875 1879 1884 1914 1919 1923 1928 1959 1963 1968 1972 30 1995 2000 2004 2009 2014 2018 31 2042 2046 2051 2056 2061 2065 32 2089 2094 2099 2104 2109 2113 33 2138 2143 2148 2153 2158 2163 34 2188 2193 2198 2203 2208 2213 35 2239 2244 2249 2254 2259 2265 36 2291 2296 2301 2307 2312 2317 37 2344 2350 2355 2360 2366 2371 38 2399 2404 2410 2415 2421 2427 39 2455 2460 2466 2472 2477 2483 40 2512 2518 2523 2529 2535 2541 41 2570 2576 2582 2588 2594 2600 42 2630 2636 2642 2649 2655 2661 43 2692 2698 2704 2710 2716 2723 44 2754 2761 2767 2773 2780 2786 45 2818 2825 2831 2838 2844 2851 46 2884 2891 2897 2904 2911 2917 47 2951 2958 2965 2972 2979 2985 48 3020 3027 3034 3041 3048 3055 49 3090 3097 3105 3112 3119 3126 6 8 0 1014 1016 1019 1021 1038 1040 1042 1062 1064 1067 1045 0 1069 0 1094 0 1119 0 0 1086 1089 1091 1112 1114 1117 1138 1140 1143 1146 1164 1167 1169 1172 1191 1194 1197 1199 0 1219 1222 1225 1227 1247 1250 1253 1256 0 1 1607 1611 1614 1644 1648 1652 1683 1687 1690 1722 1726 1730 1762 1766 1770 oooo 0 oooo 0 0 0 1 1 1 1276 1279 1282 1285 0 1306 1309 1312 1315 0 1 1337 1340 1343 1346 1374 1377 0 1 1368 1371 0 1 1400 1403 1406 1409 1 1432 1435 1439 1442 1 0 1 1466 1469 1472 1476 1500 1503 1507 1510 0 1 1535 1538 1542 1545 0 1 1570 1574 1578 1581 0 1 1618 0 1656 0 1694 0 1734 0 1774 0 ooooo 1803 1807 1811 1816 1845 1849 1854 1858 0 1888 1892 1897 1901 0 1932 1936 1941 1945 1977 1982 1986 1991 0 0 2 0 0 0 0 2023 2028 2032 2037 2070 2075 2080 2084 0 2118 2123 2128 2133 0 2168 2173 2178 2183 0 2218 2223 2228 2234 1 2270 2275 2280 2286 2323 2328 2333 2339 2377 2382 2388 2393 2432 2438 2443 2449 2489 2495 2500 2506 0 0 1 1 1 I I 1 1 I 1 1 1 1 1 1 1 1 2547 2553 2559 2564 1 2606 2612 2618 2624 1 2667 2673 2679 2685 1 2729 2735 2742 2748 2793 2799 2805 2812 2858 2864 2871 2877 1 2924 2931 2938 2944 1 2992 2999 3006 3013 1 3062 3069 3076 3083 1 1 1 3133 3141 3148 3155 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 N N N N N N NNNNNNNNN 2 2 2 2 2 2 2 2 2 4 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 NNNNNNNNNN 2 2 2 2 2 2 2 2 2 2 10 2 5 2 2 2 6 1 1 1 2 2 1 2 1 1 1 1 2 222NNNNNN 2 1 3 N NN NN 3 2 NNNNN 2 2 2 3 2 2 3 2 2 Co Co Co Co Co CONNNN 2 3 2 2 2 N N N 03 02 03 03 03 00 00 00 00 00 00 00 00 00 3 3 3 3 3 3 3 3 3 3 3 112NNNNN N N N N N N N N N N 2 3 3 2 N N N N N 2 2333232 02 03 02 03 3 0 3 3 3 3 3 3 4 4 4 4 4 7 2 2 2 3 4 4 3 4 4 N N N N N N N N N N 4 2 2 3 2 2 NNNNNNNNN 2 2 2 2 2 2 2 2 2 3 CO CO CO CO CO 3 3 3 3 3 3 02 00 00 02 02 3 3 3 3 3 02 02 02 2 3 4 4 4 4 4 4 4 4 4 10 10 10 10 4 4 5 8 9 5 5 5 5 N N N N N N N N N N 2 2 2 CO CO CO CO CO CO WNNN 2 3 3 4 2 3 2 3 2 3 3 3 3 3 3 3 3 3 Co Co Co Co Co 3 3 4 10 3 3 4 4 4 4 WWN N N N N N N N 4 3 4 02 03 04 4 3 5 5 00 00 00 00 00 00 00 00 00 00 10 10 10 10 10 10 10 10 5 5 5 4 4 5 5 5 3 5 3 3 3 0 0 0 3 3 4 4 4 4 4 4 4 4 4 10 10 10 10 10 10 5 5 5 5 5 5 20 10 00 00 Coco Coco 5 5 6 6 6 6 6 6 6 6 6 6

74 The energy of a radiation of wavelength 8000 is E and 74 energy of a radiation of wavelength 16000 is E What is the relation between these two 1 E 6E 3 E 4E Energy levels A 2 E 2E 4 E 1 2E of a certain atom corresponds to C 4 4N 4C 8000A faf E 16000 faf E 1 E 6E 3 E 4E r 2 E 2E 4 E 1 2E

73 A solution of 20 2 g of 1 2 dibromopropane in MeOH upon heating with excess Zn produces 3 58 g of an unsaturated compound X The yield of X is closest to Atomic weight of Br is 80 a 18 b 85 c 89 d 30

The specific conductance of a salt of 0 01 M concentration is 1 061 x 10 4 S cm Molar conductance of the same solution will be 1 1 061 x 104 3 10 61 2 1 061 4 106 1 14 The specific KCI is 0 001 conductance 1 140 3 1 4

How many of the following are ores of iron Haematite Limonite Magnetite Siderite Iron Pyrites Beryl Rutile Quartz Write the sum of geometrical isomer in Ma b c complex and stereoisomers in M AB complex

An aqueous solution of an acid is so weak that it can be assumed to be practically unionised boiled at 100 4 C 25ml of this solution was neutralised by 38 5mL of 1N solution of NaOH Calculate basicity of the acid if Kb for water is 0 52K mol kg Assume molality equal to molarity

6 For two particles A and B curves are plotted V against de Broglie wavelengths where V is the potential on the particles Which of the following relation is correct about the mass of particles memin b m Me 2 B A c MA MB m d

From the following observations predict the type of orbital Observation 1 x y plane acts as nodal plane Observation only Observation 3 R r v s r curve obtained for the orbital is R r 2 The angular function of the orbital intersects the three axis at origin

29 A bubble of volume V is at the bottom of a pond at 15 C and 1 5 atm pressure When it comes at the surface it observes a pressure of 1 atm at 25 C and has volume V What is the volume ratio final to initial 30 Melting point of a solid is rk and its latent heat of fusion is 600Cal mol The entrony change for

The efficiency of an ideal gas with adiabatic exponent y for the shown cyclic process would be a y 1 2 In 2 1 1 y 1 2ln 2 21n 2 1 y 1 y 1 2ln 2 1 Vo 2V0 b d B A 2T T y 1 1 21n 2 y 1 2 In 2 1 2ln 2 1 Y Y 1

In a body centred cubic structure considering an atom at a corner the distance of this corner from the opposite corner at the end of the body diagonal is x While the distance of this corner from the body centre of the adjacent cell which shares a face with this unit cell of which the corner under consideration is not a part is y Which of the following is correct

27 A sample of CaCO3 s is introduced in to a sealed container of volume 0 654 litre and heated to 1000K until equilibrium reached The equilibrium constant for the reaction CaCO3 s CaO s CO g is 3 9x109 atm At this temperature calculate the mass of CaO s present at equilibrium in mg

48 180 Mark for Review In which of the following reactions the underlined element is reduced O MnO KOH O K MnO 2H O 02 45 hr min O C 0 MnO4 H Mn CO H O O cro H Cr O H O Na SO3 Cl H O Na SO4 2HCI

63 A decimolar solution of potassium ferrocyanide is 50 dissociated at 300 K Calculate the osmotic pressure of the solution 1 7 389 atm 2 73 89 atm 3 6 157 atm 4 2 463 atm

4 64 2 13 If the radius of ions such as Mg2 Cs 02 S and C 13 3 Mg2 Cs 02 and fa 4 64 2 are 0 65 1 69 1 40 1 84 and 1 81 respectively Calculate the co ordination number of the cations in the crystals of MgS MgO and CsCl respectively will be sh 0 65 1 69 1 40 1 84 m 1 81 MgS MgO CCC 1 4 6 8 2 2 4 8 6 6x1034 3 8 6 4 4 None 9110 4x3 1416188 m 1 4 6 8 2 2 4 8 318 6 4 4 O 32 2 155 2 414 1 55 2 2 44 41 4 14

If Avogadro number NA is changed from 6 022 x 1023 mol 1 to 6 022 1020 mol 1 this would change a the mass of one mole of carbon b the ratio of chemical species to each other in a balanced equation b the ratio of elements to each other in a compound d the definition of mass in units of grams