General Questions and Answers

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

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

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

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

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

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

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

9 Arrange the orbitals of H atom in the increasing order of 69 34 their energy 3p 2s 4d 3s 4p 3p 4s 2s 3s 3p 3p 4s 4p 4dxy 2 2s 3s 3p 3p 4s 4p 4dxy 3 2s 3s 3p 3p 4s 4p 4d 4 2s 3s 3p 3p 4s 4p 4dxy xy 4T 3p 2s 4dx 3s 4p 3p 4s xy 1 2s 3s 3p 3p 4s 4p 4d 2 2s 3s 3p 3p 4s 4p 3 2s 3s 3p 3p 4s 4p 4d 4 2s 3s 3p 3p 4s 4p 4d

If pk for fluoride ion at 25 C is 10 84 the ionisation constant of hydrofluoric acid in water at this temperature is 0 3 10 5 05 10 01 10 06 10 Marks 4

A non volatile solute is added in benzene liquid so that lowering in vapour pressure of benzene is 78mm of Hg at normal boiling point of pure benzene liquid then A Molality of solution is B Molality of solution is 1000 682 682 1000 m m C Relative lowering in vapour pressure is D Relative lowering in vapour pressure is 78 682 78 760

55 The combustion of 10 gm coke raised the temperature of 1 kg of water from 10 C to 50 C If specific heat of water is 1 cal g C then the calorific value of coke is 1 1000 cal 3 3000 cal 56 The heat of combustion of naphthalene C H s at 2 2000 cal 4 4000 cal

Incorrect statement about CO is Colourless odourless and water insoluble gas It reduces almost all alkali and alkaline earth metal oxides Contains one sigma and two bonds between C and O Highly poisonous in nature

1 40 min 2 20 min 3 30 min 4 25 min 80 Correct match is are A 21 6 carat gold has 90 gold B Iron forms alloy with mercury C Invisible image formed due to deposition of silver D D penicilamine used in treatment of excess of Fe 2 ion E Catalyst used in ostwald process is V 05

6 In the reaction 6 3 2NH4 6NO3 aq 4H aq 6NO g N g 6H O 2NH4 6NO3 aq 4H aq 6NO g N g 6H O 4 1 Sty the reducing agent is 1 NH 2 NO3 3 H aq 4 NO 3LER 1 NH 4 2 NO3 3 H aq 4 NO

6 2 g of a sample containing Na CO3 NaHCO3 and non volatile inert impurity on gentle heating loses 5 of its weight due to reaction 2NaHCO3 Na CO3 H O CO Residue is dissolved in water and formed 100 mL solution and its 10 mL portion requires 7 5 mL of 0 2 M aqueous solution of BaCl for complete precipitation of carbonates Determine weight in gram of Na CO3 in the original sample B 1 59 1 06 053

11 The measurement of the electron position is associated 11 fefa 44 ats f 1x1018 gcm 11 ARE E with an uncertainity in momentum Which is equal to 1x1018 gcm s the uncertainity in electron velocity is mass of electron 9 10 28 g 1 1 x 10 1 cm s 1 2 1 x 109 cm s 1 3 1 x 106 cm s 1 4 1 x 105 cm s 1XX ABP my 43 1 O 1 1 x 1011 cm s1 2 1 x 109 cm s 1 3 1 x 106 cm s 1 4 1 x 105 cm s 1 H 480 hts 3 9 10 28 g b 47 28 T DP X1018 9x1028 fafs 0 053 f fun of Fw

8 AH H O g 20 KJ mol 1 240 KJ 2 360 KJ 3 360 KJ 4 20 KJ Which of the following statement is incorrect 1 For exothermic reactions He is less than Products 8 Reactants 2 AH of CO g is same as AH of carbon graphite 8 3 All exothermic reactions have a free energy change AG negative 9 4 For a reaction N g O g 2NO g the heat at constant pressure and heat at constant volume at a given temperature are same

A 1 100g sample of copper ore is dissolved and the Cu of it is treated with excess KI The liberated I requires 12 12mL of 0 10M Na2S2O3 solution for titration What is copper by mass in the ore

84 180 Mark for Review Incorrect statement about silicones is Water repelling in nature High dielectric strength Electrical conductors Biocompatible in nature

3 In the Freundlich adsorption isotherm log log p the value of n is m log k 1 any value from 0 to 1 2 a positive integer 3 a negative integer 4 a positive or a negative fractional number n

In which of the following reaction s H O acts as a reducing agent 1 H O 20H 2 2H 0 0 II HOCI H O H O CI O II H O PbS PbSO4 H O O 1 only O 1 and II only O II and III only 1 and un

A sample of ferrous sulphate and ferrous oxalate was dissolved in dil H 2SO 4 The complete oxidation of reaction mixture required 40mL of N 10KMnO 4 After the oxidation the reaction mixture was reduced by Zn and HH2S4 On again oxidation by same KKMnO 60mL were required Calculate the ratio of milimoles of Fe2 SO4 3 and Fe2C04 7 02 PM

73 Which of the following species is more soluble in water 1 M OH 2 M OH 3 MOH K p 1 x 10 Kp 1 10 30 K 1 x 10 2 SP

9 A first order reaction is carried out with an initial concentration of 10 mol per litre and 80 of the reactant changes into the product Now if the same reaction is carried out with an initial concentration of 5 mol per litre for the same period the percentage of the reactant changing to the product is 1 40 3 160 2 80 4 Cannot be calculated

4 None of these 9 Which of the following set of quantum number is correct 9 fe 1 n 4 1 3 m 3 S 0 1 3 2 n 4 1 0 3 n 4 1 4 4 n 4 1 0 3 3 0 4 m 2 S S J S 1 2 1 2 3 336 ml 4 1 2 1 n 4 2 n 4 3 n 4 4 n 4 1 0 1 4 1 0 m 3 m 0 m 4 m 2 S 0 S 11 01 1 J 2 1

The reduction potential of silver electrode in Ag CrO4 solution Ksp 4x solution at 25 C will be Eg Agt 0 80 V 0 80 0 80 0 80 0 80 0 0591 1 0 0591 1 0 0591 1 0 0591 log x log 2x log 2x log 2x

2 381 8 KJ mole 3 265 8 KJ mole 4 395 3 KJ mole 30 Ionic compound in which cation and anion are bonded by 80 ff for minimum force of attraction mg 1 Na N Mg3N 3 Ca3N 4 BeO 108 5 un Na 492 21 J Na Ca Atsomot that man Amie the comprent have traiti 1 281 8 KJ mole 2 381 8 KJ mole 3 265 8 KJ mole 4 395 3 KJ mole 1 Na N 2 Mg3N 3 Ca3N 4 Beo 758 7 K 1187 0 74317 1107 15 43 2 353 3

8 Select the correct statement s 1 A hydrophilic colloid is a colloid in which there is a strong attraction between the dispersed phase and water 2 A hydrophobic colloid is a colloid in which there is a lack of attraction between the dispersed phase and water 3 Hydrophobic sols are often formed when a solid crystallizes rapidly from a chemical reaction or a supersaturated solution 4 All of the above

A tube of length 50 cm is containing a gas in two sections separated by a mercury column of length 5 cm as shown in figure The open end of tube is just inside the Hg surface in container find pressure difference of gases in two sections Assume atmospheric pressure 75 cm of Hg column 10cm G Sum G P 75cm of Hg 5cm 30cm 271 G then

electron and the nucle us as ris similar to the gravitational force However when a body is moving in an orbit it undergoes acceleration even if it is moving with a constant speed in an orbit because of changing direction So an electron in the nuclear model describing planet fike orbits is under acceleration According to

65 Molecular orbital electronic configuration of Be2 will be 65 Be a KK o 2s b KK o 2s o 2s c o 1s o 1s o 2s o 2s d o 1s o 1s o 2s 2p Correct answer is 1 a b 3 c d GS 2 b c 4 a c 14 15 16 10 hond length in H Q and Bonding chaich scarifich farina a KK o 2s b KK o 2s o 2s c o 1s o 1s o 2s o 2s d o 1s o 1s o 2s 2p HEY AR 1 a b 3 c d 66 O H O O 2 b c 4 a c

For phase transformation of A 90 gm mole 4 4 1 Densities of A s and A 1 are 0 9 gm ml and 1 0 gm ml respectively Standard melting point of A 27 C AG 300 300 J mol AH 300 2700 J mol A AG 2 bar 300 K 301 J mol B AG 2 bar 300 K 299 J mol AS 300 10 J mol K CO

An electric current is passed through two solutions of 1 AgNO and ii a solution of 10g CuSO4 5H O crystals in 500 mL H O platinum electrodes being used in each case After 30 minute it is found that 1 307g Ag has been deposited What was the conc of Cu expressed in g of Cu per litre in solution after electrolysis

56 The mass of silver eq mass 108 displaced by that quantity of current which displaced 5600 mL of hydrogen at STP is a 54 g c 5 4 g The tima 0 118 d E E2 0 118 b 108 g d none of these of 80 cm wit

A particle is projected with speed 50m s at an angle 370 with the horizontal and it touches an inclined plane of inclination 300 as shown in the figure Height of the point form the ground 11n RINKI where particle touches the incline is given as Find n 3 g 10m s2 30 37

1 4 37 x 10 m s 2 4 37 x 106 m s 3 8 73 x 108 m s 4 8 73 x 108 m s 78 The transition of electrons in hydrogen atom having 78 466 minimum wavelength is 1 M 3 J 2 38 x 4 2 2 have same wavelength 2 4 37 3 8 73 x 108 m s 4 8 73 x 108 m s F 1 n 3 n5n4 2 3 4 4 84 What is the of Hetion 16 1 3R 3 GC

In an organic compound hydrogen is 2 9 times of C present and oxygen is 4 times of hydrogen present by mass The empirical formula of the compound is O C4H O O C HgO3 O CsH O3 O C3HgO Marks 4 1

1 2 the pair of position isomers Et COOH OH 3 4 Both 1 and 2 and and CICIE OH H C C C COOH C C C 8 2 6 2 and Et C C CC C C C C C

61 For pure water pH 7 Kw at 298 K is 10 14 On adding some acid to it its pH changes to 3 Then the value of Kw is 1 10 11 3 10 6 2 10 14 4 None of these

U where m is the mass of the electron and the velocity associated with the ejected electro Lastly a more intense beam of light consist of larger number of photons consequently th number of electrons ejected is also larger a compared to that in an experiment in which beam of weaker intensity of light is employed stee A fo S Dual Behaviour of Electromagne Ene 3 19 Pro A1 ligh nur by t

11 A hydrogenation reaction is carried out at 500 K 500 K no catalyst CH CH H CH3 CH3 Activation energy EkJ mol a Pd 400 K CH3 CH3 CH CH H Activation energy E 20 kJ mol If rate remains constant then Eis 1 120 kJ mol 3 20 kJ mol 1 2 100 kJ mol 4 entIm

Calculate the temporary permanent and total hardness in terms of CaCO3 equivalent in a water sample containing following dissolved salt per liter Ca HCO3 2 12 2 mg Mg HCO3 2 8 2 mg MgSO4 5 6 mg MgCl2 6 2 mg CaSO4 10 3 mg and Na SO4 7 5 mg Atomic weight Ca 40 Mg 24 C 12 S 32 O 16 H 1 Cl 35 5

Given the following information 2A g B g A B g Kp1 2A g C g 2AC g Kp2 3 2A2 g B g C g AC g A B g Kp3 Which relationship represents the equilibrium constant for the reaction 3A g 3B g 2C g 3A B g C g Knet A Knet Kp1 x Kp2 x Kp3 B Knet Kp1 x 2Kp3 Kp2 C Knet Kp1 Kp2 2 Kp3 D Knet Kp1 x Kpa Kpz E Knet Kp1 x Kp2 x Kp3 OE O S D OA OC OB P

Calculate the pH of 1 00 L of buffer containing 1 00 M CH3CO2Na 1 00 M HCH3CO2 before and after adding a 0 080 moles of NaOH b 0 12 moles of HCI Assume that the volume of the solution does not change

57 Which of the following is a polar molecule 1 Cl 2 CCI 3 SF CI SF r 4 HO Incorrect statement regarding hybridization is OH J67 ffafed 1 Cl 2 CCI 3 SF 4 HO o CI OH Ch 68 THEY A