(a)more volume that that of an ideal gas under identical conditions. (b)less volume that that of an ideal gas under identical conditions

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1 1 A flask filled with vapor weight at a temperature and pressure The flask was then filled with oxygen at the same temperature and pressure The mass of vapors would be about (a) the same as that of the oxygen (b) one fifth as heavy as oxygen (c) five times as heavy as oxygen (d) twice as heavy as oxygen Solution: (c) As the pressure, temperature and volumes remain constant therefore of moles CCI4 and O2 will be same But the molar mass of CCL4 is nearly 5 times than that of O2 2 A real gas at a very high pressure occupies (a)more volume that that of an ideal gas under identical conditions (b)less volume that that of an ideal gas under identical conditions (c) Same volume that that of an ideal gas under identical conditions (d)depends on the nature of the ideal gas under identical conditions Solution: (a) When the pressure is high, volume would be small So the van der Waal s equation reduces to P(V-b) =RT PV-Pb=RT ie 3 A large cylinder of helium filled at 2000 mm of pressure had a small orifice through which helium escaped into evacuated space at the rate of 64 moles /hour How long would it take for 10 moles of CO to leak through a similar orifice if the CO were confined at the same pressure? 21 hours (b) 42 hours (c) 56 hours (d) 112 hours

2 Solution: Ans: (b) 4 Pressure of 1 g of an ideal gas A in a flask at 27 0 C is found to be 2 bar When 2 g of another ideal gas B is introduced in the same flask at same temperature, the pressure becomes 3 bar What is the ratio of (molecular mass of A: molecular mass of B)? (a) 1:1 (b) 2:1 (c) 1:2 (d) 1:4 Solution : (d) Suppose molecular masses of A and B are MA and MB respectively Then their number of moles will be, Nb = PA=2bar, Pa+PB=3bar ie PB=1bar, Applying the relation PV=nRT Or 5 The van der waal s constants for two gases are as follows: Gas a b X Y Then which of the following statement is correct: (a) X is more easily liquefiable and has greater molecular size (b) Y is more easily liquefiable and has greater molecular size (c) X is more easily liquefiable and Y has greater molecular size (d) Y is more easily liquefiable and X has greater molecular size

3 Solution: (B) Greater the value of a, more easily the gas is liquefiable Similarly, greater the value of b greater is the molecular size Hence, gas Y will be more easily liquefiable and will have greater molecular size 6 A gaseous hydrocarbon requires 6 times its own volume of O2 for complete oxidation and produces 4 times its volume of CO2 What are the respective values of if the formula of the hydrocarbon is (a) 3,3 (b) 2,4 (c) 4,6 (d) 4,8 Solution: (D) The balanced equation for combustion is O2 volume Or Again is 4 time that of hydrocarbon Formula or hydrocarbon C4H8 7 Match list I with II and select the correct answers: List I List II A critical temperature B Boyle temperature C Inversion temperature D: Reduced temperature A B C D A B C D (a) (b) (c) (d) Ans: (D)

4 For questions 7 & 8, refer to the graph showing the graph for CO 7 Near the point A, compressibility factor Z is: (a) (b) (c) (d) Ans: (d) 8 Near the point B, compressibility factor Z is about: (a) (b) 1 (c) (d) 9 I, II, III are three isotherms respectively at, temperature will be in order: (a) (b) (c) (d) Ans: (C) 10 At the same temperature and pressure which of the following gas will have highest KE per mol? (a) (b) (c) (d) all gases will have the same KE Ans: (d)

5 11 The ratio of van der Waals constants, has the dimension of: (a) (b) (c) (d) Ans: (b) 12 To liquefy gaseous substances whose critical temperature are below room temperature requires: (a) High pressure and lowering of temperature (b) Low pressure and raising of temperature (c) High pressure and raising of temperature (d) Low pressure and lowering of temperature 13 gas is liquified more easily than hence (a) van der Waals constants a and b of (b) van der Waals constants a and b of (c) (d) Ans: (C) 14 The correct order of bond length is (a) C C C C C C (b) C C C C C C (c) C C C C C C (d) C C C C C C Ans: (b) 15 Mustard gas is (a) CH 4 (b) C 2 H 4 (c) CH 2Cl CH 2 S CH 2 CH 2Cl (d) Mix of

6 16 C H ) is chlorination forms only one type of C H Cl( ) Hence, A can be 8 18 ( A 8 17 B (a) (b) (c) (d) Ans: (d) D O Mg/ ether 2 17 R Br A CH CH D, R Br by Wurtz reaction forms 3 2 (a) CH 3CH 3 (b) CH 3 CH 3, CH 3CH 3 (c) CH 3 CH 3, CH 3CH 3, CH 2 CH 2 (d) CH 3 CH 3, CH 2 CH 2 18 Ethylene reacts with bromine to form (a) Br CH 2 CH 3 (b) CH 3 CBr3 (c) Br CH 2 CH 2Br (d) CHBr 3 19 The decreasing order of boiling points is (a) n-pentane > iso-pentane > neo-pentane (b) iso-pentane > n-pentane > neo-pentane (c)neo-pentane > iso-pentane > n-pentane (d) n-pentane > neo-pentane > iso-pentane 20 Condition for maximum yield of C 2 H 5 Cl is (a) (c) UV light C 2 H6`(excess) Cl2 (b) UV light C Dark 2 H 6 Cl 2 Room temp UV light C 2 H 6 Cl 2 (excess) (d) C 2 H6 Cl2 21 The treatment of C2H5MgI with water produces (A) Methane (B) Ethane (C) Ethanal (D) Ethanol Ans: (B) 22 The order of reactivity of halogens towards halogenation of alkanes is (A) F2 > Br2 > Cl2 (B) F2 > Cl2 > Br2 (C) Cl2 > F2 > Br2 (D) Cl2 > Br2 > F2 Ans: (B) 23 The chlorination of alkane involves (A) Cl free radicals (C) Cl species Ans: (A) (B) Cl + species (D) CH3 free radicals 24 Select the wrong alternate for Corey-House reaction (a) An organometal (b) A nucleophilic substitutions (c) a nucleophilic addition (d) formation of C C bond

7 25 The most strained cycloalkane is: (a) Cyclobutane (b) Cyclopropane (c) Cyclopentane (d) Cyclohexane Ans: (b) 26 x & y are: (a) (b) (c) Both are true (d) None of these 27 n-hexane can be converted in to benzene by the treatment with (a) Alk KMnO 4 (b) alc KOH (c) Cr 2 O 3 at 770K (d) LiAlH 4 28 Marsh gas mainly contains (a) (b) (c) (d) Solution: (b) Methane is the principal product of organic decay in swamps and marshes, the gas being set free by the action of bacteria, this method of formation in nature ahs given rise to the name marsh gas for methane 29 Which of the following conformers is the most stable form of butane: (a) Fully eclipsed (b) Partially eclipsed (c) Gauche (d) Staggered 30 on reaction with produces (a) (b) (c) (d) Solution: (a)

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