Chemistry DPP - Daily Practice Problems PDF

DPP - Daily Practice Problems Chapter-wise Sheets Date : L.. -----l Start Time : End Time : C H E M I STRY (Ceo...

DPP - Daily Practice Problems Chapter-wise Sheets Date : L.. -----l Start Time : End Time : C H E M I STRY (Ceo SYLLABUS : States of Matter Max. Marks : 180 Marking Scheme : + 4 for correct & (-1 ) for incorrect Time : 60 min. INSTRUCTIONS : This Daily Practice Problem Sheet contains 45 MCQ's. For each question only one option is correct. Darken the correct drcle/ bubble in the Response Grid provided on each page. 1. A compOlmd exists in the gaseous state both as monomer A becomes halfand its absolute temperature 2/3rd. The amount anddimer A 2. The M. wt. ofmonomer is48. In an experiment of the gas escaped is 96 g of the compound was confined in vessel of33.6 L and (a) 213m (b) 112m (c) 114m (d) 116m heated to 273 oc. Calculate the pressure developed, if the Let the most probable velocity of hydrogen molecules at a 4. temperature oft° C be V0. When the temperature is raised compotmd exists as a dimer to the extent of50% by weight to (2t + 273)°C the new rms velocity is (suppose all the tmder the conditions molecules dissociate into atoms at latter temperatme) (a) 0.9aun (b) 4.0atm (c) 2.0atm (d) l.Oatm 2. The molecular velocities oftwo gases at the same temp atme are er (b) J6vo u1 and u2 and their masses are m 1 and m2 respectively. Which of the following expressions are correct ? (c) 5. By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled ? 3. A container contains certain gas of mass 'm' at high (a) 2.0 (b) 2.8 pressure. Some of the gas has been allowed to escape from (c) 4.0 (d) 1.4 the container and after some time the pressure of the gas RI-.SPO:\SI-. 1. ®®®@ 2. ®®®@ 3. ®®®@ 4. ®®®@ 5. ®®®@ GRID Spacefor Rough Work ------ w www ww.p phys hysiccsguruku sgurukul.cco om | w www ww.ssuccessrouter uccessrouter.cco om  DPP/ CC05 6. The correct value of the gas constant 'R' is close to : (b) 2 (PA I P8 )1 1 (MB I MA) (a) 0.082 litre-atmosphere K (b) 0.082litre-atmosphereK-1 mol-1 l/2 (c) (PA I PB )(MA I Ms ) (c) 0.082litre-atmosphere 1K mol 1 (d) 0.082 litre _, atmosphere - ' K mol (d) (P11 1 Ps )1 1 2 (M11 1 Ms ) 7. I f ! o-4 dm3 ofwater is introduced into a 1.0 dm3 flask at 15. Longest mean free path stands for : 300 K, how many moles of water are in the vapour phase (a) Hz (b) N2 (c) 02 (d) C when equilibrium is established? (Given : Vapour pressure of 0 at 300 K is 3 1 70 Pa; 16. The root mean square velocity of an ideal gas at constant R = 8.3 1 4 J K-' mol-1) pressure varies with density (d) as (a) 5.56x J0-3 2mole (b) 1.53 x t0-2 mole (a) d 2 (b) d (c) Jd (d) 11 Jd (C) 4.46 X 1 0 mole - (d) 1.27 X 10-3 mole 17. The correct order ofviscosity oftl1 e following liquids will 8. A vessel is filled with a mixture of 02 and N 2. At what be ratio ofpartial pressures will be the mass ofgases be identical (a) Water < methyl alcohol < d imethyl ether < glycerol (a) p(Oz) = 8. 75 p(N 2) (b) p(Oz) = 0. 78 p(Nz) (b) methyl alcohol < glycerol< Wdter < dimethyl ether (c) d imethyl ether< methyl alcohol < water < glycerol (c) P(o ) = 0. 875 P(N2) (d) P(o2 ) = 1 1.4 P(N2) 2 (d) glycerol < dimethyl ether< water< methyl alcohol 9. Helium has the van der Waal's constant b = 24 mL mol -1 18. The molecular velocity ofany gas is The molecular diameter ofbelium will be (a) inversely proportional to absolute temperature. (a) 267pm (b) directly (c) d irectlyproportional proportionaltotosquare squareroot of temperature. oftemperature. (b) 133.5pm (d) inversely proportional to the square root oftemperature. (c) 26.7pm 19. Which of the following volume (V) - temperature (T) plots (d) Data not sufficient for calculation the diameter. represents the behaviour ofone mole of an ideal gas at one 10. A bubble ofthe gas released at the bottom ofa lake increases atmospheric pressure ? to eight times the original volume when it reaches at the V(L) V(L) surface. Assuming that the atmospheric pressure is (36.8 L (26.8 L equivalent to pressure exerted by a column of water 10 m (22.4 L 373 K) (22.4 L 373 K) 273K) 273K) high, what is the depth of the lake (a) 80m (b) Wm (c) 10m (d) 70m 11. Air at sea level is dense. This is a practical application of (a) Boyle's law (b) Charle'slaw (a) T(K) T(K) (b) (c) Kelvin'slaw (d) Brown'slaw V(L) V(L) 12. Which of the following represents Gay Lussac's law ? (30.6L p (22.4 L 373 K) (22.4 L I. - = constant U. P T2= P2T 273K) 273K) T 1 1 (14.2 L ill. P1V1 = P2V2 373 K) Choose the correct option. T{K) (d) T(K} (a) I, II and III (b) U and Ill (c) (c) IandUI (d) Iandll 20. Match the columns Column-1 Column-ll l 13. A bubble of air is underwater at temperature ! 5°C and the A. Boyle's law V oc n at constant T and P ll. pressure 1.5 bar. Ifthe bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will B. Charle's law Ptotal = P1+ P2+ p3+ ···· happen to the volume ofthe bubble ? at constant T, V (a) Volume will become greater by a factor of 1.6. V P Constant (b) Volume will become greater by a factor of 1. 1. c. Dalton's law m. T (c) Volume will become smaller by a factor ofO. 70. D. Avogadro law IV V oc T at constant n and p (d) Volume will become greater by a factor of2.5. I 14. When r, P and M represent rate of diffusion, pressure and V P at constant n and T V molecular mass, respectively, then the ratio of the rates of (a) A - V; B - IV; C - II; D - I diffi.1sion (rA I r8 ) oftwo gases A and B, is given as : (b) A - IV; B - 11; C - I; D - V (c) A - Ill; B - V; C - II; D - I (a) (PA I P8 ) ( MB I M,d12 (d) A - V; B - II; C - IV; D - III RI-. SPO:\Sl-. 6. ®®@@ 7. ®®@@ 8. ®®@@ 9. ®®@@ 10. ®®@@ GRID 1 1. @@@@ 12. @@@@ 13. ®®@@ 14. ®®@@ 15. ®®@@ 16.@@@@ 17.@@ @@ 18. @@@@ 19. @@@@ 20. ®®@@ Spacefor Rough Work ------- w www ww.p phys hysiccsguruku sgurukul.cco om | w www ww.ssuccessrouter uccessrouter.cco om 21. The rms velocity of hydrogen is J7 times the rms (a) 4 (b) 2 (c) 1 (d) 1/4 velocity of nitrogen. If T is the temperature of the gas, 28. Positive deviation from ideal behaviour takes place because then of (a) T( )=T(N2) (b) T( )> T(N2) (a) Molecular interaction between atoms and PV/nRT> I (d) T ) = J7 T(N2) (b) Molecular interaction between atoms and PV/nRT < I (c) T( )< T(N2) (c) Finite size ofatoms and PV/nRT> 1 22. lfZ is a compressibility factor, van der Waals equation at (d) Finite size ofatoms and PV/n.RT < 1 low pressure can be written as: 29. Equal masses ofmethane and oxygen are mixed in an empty container at 25°C. The fraction ofthe total pressure exerted RT 0- by oxygen is (a) Z = l + - (b) Z = l - - Pb Pb VRT Pb (a) 1/2 (b) 2/3 (c) 1 273 -x- 3 298 (d) 1/3. (c) z = 1 - RT (d) z = I + RT 30. The rate of diffusion ofS02, C02 , PC13 and S03 are in the Refer to the fig·ure given : following order 23................. is wrong? (a) PCI3 > S03 > S02 >C02 ··· Which of the following statements t ······ ·/ 1 gas C (b) C0 > S02> PC > S03 2. gas A (c) S02 > S03 > PC > C02 ······· cd) C02 > so2 > so3 > PCt3 zI ·····-······----1---- ideal gas The van der Waal's equation for n = I mole may be expressed ( RT)v2 31. / --:::: :...:........:::::.:/ ·············· ·· ···· as y3 - b + + aV _ ab = 0 ·· · ·· gas B p p p Where V is the molar volume of the gas. Which of the following is correct? (a) For a temperature less than Tc, V has three real roots P -- (a) For gas A, a= 0 and Z will linearly depend on pressure (b) For a temperature more than T , V has one real and two.. c (b) For gas B, b = 0 and Z will linearly depend on pressure 1magmary roots (c) Gas C is a real gas and we can find 'a' and 'b' if (c) For a temperature equal toTe all three roots ofV are real and identical intersection data is given (d) All ofthese (d) All van der Waal gases will behave like gas C and give 32. By how many folds the temperature ofa gas would increase positive slope at high pressure Equal masses of ,02 and methane:::have been taken in a when the root mean square velocity ofthe gas molecules in 24. container of volume V at temperature 27°C in identical a container of fixed volume is increased from 5 x 1 04 cm/s conditions. The ratio of the volumes of gases H2 : 02 : toiO x I 04 cm/s ? methane would be: (a) Two (b) Three (c) Six (d) Four (a) 8 : 16 : 1 (b) 16 : 8 : 1 (c) 16 : 1 : 2 (d) 8 : 1 : 2 33. The density ofneon will be highest at 25. Which one of the following statements is NOT true about (a) S.T.P. (b) 0°C,2 atm the effect of an increase in temperature on the distribution (c) 273 OC, 1 atm. (d) 273 °C, 2 atm. ofmolecular speeds in a gas? 34. Above Boyle point, real gases show X from (a) The area under the distribution curve remains the same ideality and Z values are Y than one. as tmder the lower temperature (a) X= Negative deviation, Y = Less (b) The distribution becomes broader (b) X = Negative deviation, Y =Greater (c) The fraction of the molecules with the most probable (c) X= Positive deviation, Y = Less speed increases (d) X = Positive deviation, Y =Greater (d) The most probable speed increases 35. Induced dipole moment depend upon the 26. As the temperature is raised from 20°C to 40°C, the average I. dipole moment present in the permanent dipole. kinetic energy ofneon atoms changes by a factor of which n polarisability ofthe electrically neutral molecules. ofthe following ? Identify the correct option. (a) 313/293 (b) (313/293) (a) I is correct but II is wrong (c) I /2 (d) 2 (b) I is wrong and II is correct 27. The ratio between the root mean square speed of at 50 K (c) Both 1 and II are wrong and that of02 at 800 K is, (d) Both T and II are correct RI-. SPO:\Sl-. 21.®® 0@ 22.®® 0@ 23. ®®0@ 24. ®®0@ 25. ®®0@ GRID 26.®®0@ 27.®®0@ 28.®®0@ 29.®®0@ 30. ®®0@ 3 1. ®®0@ 32.®®0@ 33. ®®0@ 34. ®®0@ 35. ®®0@ Spacefor Rough Work ------ w www ww.p phys hysiccsguruku sgurukul.cco om | w www ww.ssuccessrouter uccessrouter.cco om  DPP/ CC05 36. Following table represents critical temperature of some gases. Arrange these gases in their increasing order of liquification. B. n. p vs. V Gas Tc / K H2 33.2 N2 He 5.3 126 1 c m. p vs. 02 154.3 V < &< < (a) A - III; B - I; C - 11