Physical Chemistry Questions

For the reaction N O4 9 K rate of disappearance of NO will be 1 K N O4 K NO 2 2K N O4 2K NO 3 K NO K N O4 4 2K NO 2K N O4 2NO g the

Consider the reaction B k K The rate constant for two parallel reactions were found to be 10 2 dm mole s and 4 x 10 2 dm mole s k If the corresponding energies of activation parallel reactions are 80 kJ and 100 KJ respectively then apparent net overall energy of activation of given reaction in KJ is 16 x Then x is

2 53 The energy released in joule and MeV in the following nuclear reaction 3 H H He n 1 0 3 2 Assume that the masses of H He and neutron n respectively are 2 0141 3 0160 and 1 0087 in amu is 10 3 J

Equal volumes of 0 015 M CH3COOH 0 015 M NaOH are mixed together What would be the molar conductivity of mixture if conductivity of CH3COONa is 6 3 10 4Scm 1 Question Type Single Correct Type 1 2 3 8 4 S cm mol 1 84 S cm2 mol 1 4 2 S cm mol 1

6 626 x 10 Js The expression of radius of a Bohr orbit in a hydrogen like species is 4n m Ze 4neo h A C 2 r n r n h 4n m Ze 4 E B D r 1 An m Ze Are h An m Ze 4

Chem Section B This section contains 15 SINGLE CORRECT TYPE questions Out of these 15 questions candidate Consider the following reaction XeF2 PF5 The product obtained is XeF4 PF3 XeF5 PF Read More XeF3 PF4

100 ml of a solution containing NaHCO3 Na CO3 required 50 ml of 0 1 M HCI to reach the phenolphthalein end point But the same volume of this solution required 125 ml of 0 2 M HCI to reach the methyl orange end point The molarities with respect to HCO3 and CO ions in the solution would be respectively A 0 05 0 05 C 0 025 0 025 B 0 025 0 05 D 0 15 0 05

electric 4 5g of aluminium at mass 27 amu is deposited at cathode from Al solution by a certain quantity of charge The volume of hydrogen produced at STP from H ions in solution by the same quantity of electric charge will be 1 44 8L 2 11 2L 3 22 4L 4 5 6L

v The osmotic pressure of CaCl and urea solutions of the same concentration at the same temperature are respectively 0 605 atm and 0 245 atm Calculate van t Hoff factor for CaCl 2 469

Consider the following statements a Co NH3 5 NO Cl shows linkage isomerism b Co C 04 31 is an inner orbital complex c Cis CrCl ox 1 is chiral and optically active species The correct statements is are X a and b only b and c only a and c only a b and c

Question 20 The rate constant of a certain reaction is given by 212 log10 K 5 4 T A B 2929Cal C A 2712Cal D 1744Cal B C 4218Cal 2 17 log10 T Calculate the activation energy at 177 C 4

Consider the associated colloids i e micelles and identify the correct statement O The part of micelle which is pointing outwards is non polar in normal water O A micelle made of sodium lauryl sulphate carries positive charge O They are also known as macromolecular colloids O Hydrophobic part of micelles enters into the greasy dirt on cloth

53 The overall formation constant for the reaction of 6 mol of CN with Cobalt II is 1 x 10 9 The formation constant for the reaction of 6 mol of CN with Cobalt III is X1063 Given that 019 Co CN 3 e Co CN 6 ERP 0 83 V Co 3 e 1 Co 2

63 54 The pressure of H required to make the potential of H electrode zero in pure water at 298 K is 1 10 4 atm 2 10 12 atm 3 10 10 atm 4 104 atm The number of electrono d la bu umont of 1 more in 60 seco

A mixture of NH3 g and N H g is placed in a sealed container at 300K The total pressure is 0 55 atm The container is heated to 1200K at which both gases decompose completely according to the equation 2NH3 g N g 3H g and N H4 9 N g 2H g After complete decomposition the total pressure at 1200K is found to be 5 5 atm Find the moles of N H4 in the original mixture A B C D O A B 30 25 40 75

A 28 mL of a 0 45 M HF solution is titrated to the equivalence point with a 0 45 M NaOH solution What is the pH at the equivalence point The Ka for HF is Ka 6 6 x 10 4 Please express your answer to the 3rd decimal place

76 3 4x10 6 mol lit 4 4x10 4 mol lit 1 7 3 4 xl yMnO zH O pl qMnO OH www 1x 10 4 Sto 01 The values of x y z p q r are respectively 1 3 2 1 4 8 6 2 2 6 4 3 2 8 3 6 2 4 3 2 8 4 4 2 6 2 38

Dinitrogen and dihydrogen react with each other to produce ammonia according to below reaction N 3H 2 NH3 If 2 103 g of dinitrogen reacts with 1 x 10 g of dihydrogen What is the mass of ammonia produced

59 At 298 K the standard reduction potentials are 1 51 V for MnO4 Mn 1 36 V for Cl Cl 1 07 V for Br Brand 0 54 V for I I At pH 3 permanganate is expected to oxidize 1 Cl and Br 2 Cl Br and I RT F 0 059V 3 Br and I 4 I only

Pre Medical Which of the following will not be present in last flask during the iodometric titration of Cu 2 3 B 8 B E colour less 30 1 starch A blue light bronze 2 Cu l2 3 dark bronze 3 12 D 4 Na S O3

During the balancing of the following reaction Au KCN H O O2 KAu CN KOH If the stoichiometric coefficient of Au is maintained as 1 than the sum of the stoichiometric coefficients of all the species present is 1 8 75 2 11 25 3 10 4 12 65

Gasoline consists of 70 heptane and 30 octane by volume The combustion of 683 76 g heptane is given according to the equation below C7 H16 1 220 2 g 7CO 2 g 8H2 O 1 Calculate the quantity of energy released if the molar enthalpy for the reaction 4464 7 kJ mol

Sir please explain how to use this table as there are mar questions which involve antilog in chemistry ANTILOGARITHMS TABLE II N 00 201 03 1072 1074 1076 O 1 2 3 4 5 1000 1002 1005 1007 1009 1012 1023 1026 1028 1030 1033 1035 02 1047 1050 1052 1054 1057 1059 1079 1081 1084 04 1096 1099 1102 1104 1107 1109 05 1122 1125 1127 1130 1132 1135 06 1148 1151 1153 1156 1159 1161 07 1175 1178 1180 1180 1183 1186 1189 1189 08 1202 1205 1208 1211 1213 1216 09 1230 1233 1236 1239 1242 1245 1153 10 1259 1262 1265 1268 1271 1274 511 1288 1291 1294 1297 1300 1309 12 1318 1321 1324 1327 1330 1334 13 1349 1352 1355 1358 1361 1365 14 1380 1384 1387 1300 1393 1396 15 1413 1416 1419 1422 1426 1429 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 20 1585 1589 1592 1596 1600 1603 21 1622 1626 1629 1633 1637 1641 22 1660 1663 1667 1671 1675 1679 23 1698 1702 1706 1710 1714 1718 24 1738 1742 1746 1750 1754 1758 1786 1791 1795 1799 1828 1832 1837 1841 1871 1875 1879 1879 1884 1914 1919 1923 1928 1959 1963 1968 1972 25 1778 1782 26 1820 1824 27 1862 1866 28 1905 1910 29 1950 1954 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 2356 2360 2566 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 2568 2594 2600 42 2630 2536 2542 2649 2655 2561 43 2592 2695 2754 2710 2716 2723 44 2754 2761 2767 2775 2780 2786 45 28182825 283 281 282 2844 2851 8 9 1 6 7 1014 1016 1019 1021 0 1038 1040 1042 1045 0 1062 1064 1067 1069 0 1086 1089 1001 1094 0 1112 1114 1117 1119 G 1138 1140 1143 1146 0 1164 1167 1169 1172 0 1191 1194 1197 1199 0 1219 1222 1225 1227 0 1247 1250 1253 1256 0 1607 1611 1614 1618 0 1644 1648 1652 1656 0 1683 1687 1690 1694 0 1722 1726 1730 1734 0 1762 1766 1770 1774 0 111 2 1 1 2 2 1276 1279 1282 1285 0 1 1306 1309 1312 1315 0 1 1337 1340 1343 1346 0 1 1 1 2 2 1368 1371 1374 1377 0 1 112 2 1400 1403 1406 1409 0 1 11 2 2 1432 1435 1439 1442 0 1 1 1 2 2 1466 1469 1472 1476 0 1 11 2 2 1500 1503 1507 1516 0 111 2 2 1535 1538 1542 1545 0 1 1 1 2 2 1570 1574 1578 1581 0 111 2 2 1803 1807 1811 1816 0 1845 1849 1854 1858 0 1888 1892 1897 1901 0 1932 1936 1941 1945 0 1977 1982 1988 1991 0 2 4 5 6 7 01 111 22 01 111 222 01 1 1 1 2 2 2 0 11 112 2 2 11 2 2 2 2 1111 2 2 2 2 1 1 1 1 2 2 22 1111 2 2 2 2 1 1 1 1 2 2 2 3 112 2 2 3 1 2 1 2547 2553 2559 2564 1 2806 2612 2618 2024 1 2667 2673 2679 2685 1 1 2729 2735 2742 2748 1 2793 2799 2805 2912 1 2858 2864 2871 2877 1 1 1 I 1 1 1 1 1 1 1 2023 2028 2032 2037 0 1 2070 2075 2080 2084 0 1 2118 2123 2128 2133 9 1 2168 2173 2178 2183 0 2218 2223 2228 2234 2270 2275 2280 2286 1 2323 2328 2333 2339 1 2377 2382 2388 2393 1 2432 2438 2443 2449 1 2489 2495 2500 2506 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 12 2 1 2 1 2 1 2 1 2 12 1 2 1 2 2 2 2 2 2 2 2 2 2 2 2 2 P 2 22 2 2 2 3 2 2 3 3 2 2 3 2 2 2 2 3 2 2 3 2 2 3 2 2 3 2 3 3 2 3 3 2 3 3 2 3 3 3 3 2 2 33 18 9 2 334 3 3 4 2 2 3 2 2 3 2 2 3 2 3 3 2 3 3 2 3 3 2 3 3 3 3 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 3 3 4 334 3 34 344 344 344 344 344 344 45 4 4 5 4 5 4 4 45 4 465 2 3 4 2 34 2 3 4 455 4 55 4 5 6 334450 456 556

3 When an inorganic compound X having 3c 2e as well as 2c 2e bonds reacts with ammonia gas at a certain termperature gives a compound Y isostructural with benzene Compound X with ammonia at a high temperature produces a substance Z 1 X is B H 3 Y is B N H6 2 Z is known as inorganic graphite 4 All of these

171 Find activation energy Ea from following graph 1 and OP y R is ideal gas if slope tan 0 constant P In K O 1 R 2 R 3 R y 4 R y 1 T 172 The reduction potential of hydrogen electrode at pOH 4 is 1 0 59 V 2 0 59 V 3 0 236 V

pices a Assertion and reason both are correct statements and reason is correct explanation for assertion b Assertion and reason both are correct statements but reason is not correct explanation for assertion c Assertion is correct statement but reason is wrong statement Assertion is wrong statement but reason is correct statement Assertion A Colloidal solutions show colligative properties Reason R Colloidal particles are large in size 1 OR Assertion A Colloidal solutions do not show brownian motion Reason R Brownian motion is responsible for stability of sols ii Assertion A Colloidal particles always carry an electric charge Reason R The sol particles acquire positive or negative charge by preferential adsorption of positive or negative ions iii Assertion A Colloidal solutions show Tyndall effect where the path of a beam of light is visible through the colloidal dispersion Reason R Colloidal particles scatter light in a straight line in the solution iv Assertion A The colour of colloidal solution is independent of the wavelength of light scattered by the dispersed particles Reason R The colour of colloidal solution changes with the manner in which the observer receives the light

Plz Tell me this Question is Correct or Not Sir Mam plz explain answer in very easy approach I Think that instead of Ca3 PO4 2 It Should be Ca3 S 04 2 Equivalent conductivity of Ca3 PO4 2 is related to its molar conductivity by the expression 1 eq 2m 2 eq 32m 3 eq 2 m 4 Zeq 2m 6

Briefly but informatively discuss the functions of ion sources used in mass spectrometry Give examples of at least two sources that are used for gas chromatography mass spectrometry GC MS

If the atomic weight of carbon is set at 24 amu the value of the avogadro constant would be 1 6 022 x 1023 2 12 044 x 1023 3 3 011 x 1023 4 none of these

Boron has an extremely high melting point because of 1 The strong vander Waals forces between its atoms 2 The strong binding forces in the covalent 3 Its ionic crystal structure 4 Allotropy Thi

8 Four successive members of the first series of the transition metals are listed below For which one of them the standard potential EM M value has a positive sign 1 Cu Z 29 2 Fe Z 26 3 Co Z 27 4 Ni Z 28

Solution of Assignment Set 44 What is the increase in entropy when 11 2 L of O are mixed with 11 2 L of H at STP 1 0 576 J K 2 5 76 J K 3 7 56 J K 4 2 76 J K

This section contains 35 SINGLE CORRECT PE questions Each question has 4 choices 1 2 Read More Vapour phase refining is used for which of the following elements Ozr Ge O cu

Addition of KI to a solution of Ag NH3 2 NO3 precipitates AgI but no precipitate of Ag is formed when KI is added to a solution of K Ag CN of same molar concentration as that of ammine complex If the instability constants of the two complexes be k and k respectively then a k k c k k b k K d k 2ko

the distance between two octahedral voids of a cubic close packing of atoms with radius ris 2r the distance between two tetrahedral voids of a cubic close packing of atoms with radius r is 6xr at the body diagonal axes Both of these

State Heisenberg s uncertainty principle Calculate the uncertainity in the position of an electron in its velocity is i 0 001 ii zero Given velocity of electron 300m s State Afhau s principle 3

The temperature coefficient of the rate of a reaction is 2 3 How many times will the rate of reaction increase if the temperature is raised by 25 K 2 3 25

2 51 A drop of solution volume 0 05 ml contains 3 0 x 10 6 mole of H If the rate constant of disappearance of H is 1 0 x 107 mole 1 s It would take for H in drop to disappear in X 10 s

yetha viii The osmotic pressure of blood is 7 65 atm at 310 K An aqueous solution of glucose isotonic with blood has the percentage by volume a 5 41 c 4 53 b 3 54 d 53 4

14 The reduction potential of hydrogen half cell will be negative if 1 p H 2 atm H 1 0 M 3 p H 1 atm and H 2 0 M 2 p H 2 atm and H 2 0 M 4 p H 1 atm and H 1 0 M

Q 47 The Gibb s energy change in J for the given reaction at Cu Sn 1 M and 298 K 2 2 is 2 2 Cu s Sn aq Cu aq Sn g 2 2 E Sn Sn 0 16V E Cut Cu 0 34V Take F 96500 C mol 1

You have been asked to prepare buffer of PH 7 6using KOH and Ortho phosphoric acid Sum of concentrations of all phosphoric acid species is 0 10M What is the molar concentration of potassium ions in such buffer solutions PKa 4 3 PKa2 7 3 PKa3 10 6 log2 0 30

In bredig s arc method is it necessary t o stabilize the colloidal sol with koh my dbt is that the collidal sol formed by that will method be formed negatively c harged and that negative charge will its elf going to stabalize the sol then why a ny other stabilizer is used and if it used then with mechanism koh stabalize the sol

All the sub parts are compulsory a A jacketed stirred tank with a provision for heat removal is used to mix sulfuric acid and water in a steady state flow process H SOA 1 enters at a rate of 4 at 25 C and H O 1 enters at a rate of 6 what is the rate of heat removal ind The following data are available Specific heat capacity of water 4 2 kJ kg K 1 h at kg h 10 C If the mixed stream leaves at 40 C Specific heat capacity of aqueous solution of 40 mass H SO 2 8k J kg solution K Assume the specific heat capacities to be independent of temperature Based on reference states of H SOA 1 and H O 1 at 25 C the heat of mixing for aqueous solution of 40 mass H SO4 650 kJ kg H SO

For which of the following ionic compounds AH is negative only due to lattice energ i NaF ii MgO iii Li 3N iv Na2S b Only iii iv d All of these a Only iv c Only ii iii iv

Q 55 Phenol associates in benzene to a certain extent to form a dimer A solution containing 20 x 103 kg of phenol in 1 0 kg of benzene has its freezing point depressed by 0 69 K The fraction of phenol that has dimerised is K for benzene 5 12 K kg mol

Which of the following staternents regarding Bohr theory of hydrogen atom is not correct A The ionization energy of atom is equal to the energy equivalent to Rydberg constant Speed of electron in the n 2 orbit is larger than that in the n 1 orbit Radius of orbit is directly proportional to square of quantum number n The distance between successive orbits increases with increase in the value of quantum number n B C D

4 12 mg of ROH is added to Grignard reagent CH3Mgl If 1 56 ml of a gas is produced at STP the molar mass of alcohol will be nearly O 29 5 g mol 1 O 59 g mol 1 O 118 g mol 1 O224 g mol 1

Consider the reaction Cl aq H S aq S s 2 H aq 2 Cl aq The rate equation for this reaction is rate k Cl H S Which of these mechanisms is are consistent with this rate equation A Cl H S H CI CI HS slow CI HS H CI S fast B H S Cl HS H HS fast equilibrium 2 CI H S slow O A only OB only O Both A B ONeither A nor B

Addition of water to which of the following equilibria causes it to shift in the backward direction a CH NH aq H O CH NH aq OH aq b AgCl s Agt aq Cl aq c HCN aq H O 0 H O aq CN aq d Cr dien aq 3H O 1 3Cl aq Cr H O Cl3 aq 2 dien aq ALIV 21