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Henry Stevenson
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1 Graham s Law of Diffusion 1. Dalton s law of partial pressure is not applied for 1) N CO ) NO O 3) CO O ) O, N. vessel contains Helium and Methane in : 1 molar ratio at 0 bar pressure. Due to leakage, the mixture of gases starts effusion. So the composition of mixture effused in the initial stage 1) 8 : 1 ) : 1 3) 1 : 1 ) 1 : Hint: r M r M Consider two flasks connected by a stopcock. One flask has a volume of 50 ml and contains Neon gas at 650 torr and the other flask has a volume of 300 ml and contains O (g) at 85 torr. If the stopcock is opened so that the two gases mix, calculate the partial pressure of Neon gas 1) 95 torr ) 50 torr 3) 75 torr ) 00 torr Hint: of Neon= pxv of neon/total volume. The ratio of rate of diffusion of He and Methane gases at given temparature is 1) :1 ) 1 : 3) 1: ) :1 r Hint; 1 M r M 1 5. The principle involved in the separation of Uranium isotopes is 1) Dalton s law ) Graham s law 3) Charles s law ) oyle s law

2 6. gm of Helium diffuses through a porous membrane in certain time the mass of sulphur dioxide that diffuses through the same porous membrane in the same time under similar conditions is 1) 8gm ) 16gm 3) gm ) gm w w Hint: 1 M1 M 7. vessel contains hydrogen and oxygen in the volume ratio : 1. Due to a hole in the vessel the gas is effusing out. The volume ratio of H and O that is effusing out initially is 1) 1 : 8 ) : 1 3) 8 : 1 ) 5600 : 1 Hint: r M r M 1 1 1, p is proportional to n 8. vessel contains equal moles of Helium and sulphurdioxide. Due to a hole in the vessel half of the initial number of moles in the vessel effused out the molar ratio of helium and sulphurdioxide in the residual gas in the vessel is 1) 1 : 1 ) 1 : 3) : 1 ) 1 : r Hint: 1 M,The molar ratio of residual gases is R:R1 r M 1 9. Vapour pressure of water at 60C is 300 m.m. 1 litre of vessel contained carbon dioxide saturated with water vapour at 60C at a total pressure of 760 torrs. The contents of the vessel are completely transferred in to a lit vessel at the same temperature the partial pressure of oxygen, water vapour and the total pressure in the second vessel are respectively (in mm) 1) 30 : 150 : 380 ) 380 : 150 : 530 3) 80 : 300 : 380 ) 90 : 600 : 150

3 Hint: 1 V,aqueous tension remains same at given temparature 10. vessel contains of equal weights of He, CH, O and SO gases at ST conditions the order of partial pressure of the gases 1) 3) He CH O ) SO He CH O SO He CH O ) SO CH SO He O Hint: artial pressure number of moles 11. Equal volumes of b and He measured under the same conditions of temperature and pressure are mixed and transferred into a one litre vessel at the same temperature. Then the partial pressures of H and He are related as 1) H He He ) H 3) H Hint: artial pressures are in the ratio of their mole fractios. He H ) 1. 50ml of SO diffused through a porous membrane is 16sec under the similar conditions 500ml of an unknown gas is diffused in 8sec. The unknown gas may be 1. H ) He 3) CH ) O v1t M Hint: v t M Two vessels of identical volumes were separately filled with CH at atm and O at 1atm pressure at a constant temperature. The ratio of rates of diffusion CH to O is 1 ) 1. Mixing of two gases by diffusion is 1 He 1 3) ) 1Reversible ) Exothermic 3) Irreversible ) Endothermic

4 15. The pressure of saturated water vapour at 5C is.8 m.m. t 100C the pressure of saturated water vapour will be 19. m.m. ) 31.6 m.m. 3) 760 m.m. ) 316 m.m. 16. mong the following gaseous elements, which will have greater rate of diffusion? [Z = atomic number] 1) Z = 7 ) Z = 8 3) Z = 9 ) Z = Dalton s law of partial pressure is not applicable to 1 CO CO ) CO Cl 3) N H ) CO Cl ml of hydro carbon having the molecular weight 16 diffuses in 1.5 min. under similar conditions, the time taken by 10 ml of SO to diffuse is 1) min ) 1.5 min 3) 1 min ) 1.75 min 19. ccording to Graham s law at a given temperature the ratio of rate of diffusion 1. r r M M of gases and is given by 1/ M ) M 1/ 3) M M 0. Which one of the following gas has highest diffusion rate? 1/ ) M M 1) Fluorine (at. Wt = 19) ) Neon (at. Wt = 0) 3) Chlorine (at. Wt = 35.5) ) Oxygen (at. Wt = 16) 1. Helium diffuses twice as fast as another gas. The gas may be 1) Oxygen ) Methane 3) Neon ) SO. Which is lighter than dry air? 1) Moist air ) SO 3) Cl ) N 3. gaseous mixture contains 56g of N, g of CO and 16g ofch. If the total pressure of the mixture is 70 mm of Hg then the partial pressure of CH is 1)180 mm ) 360 mm 3) 50 mm ) 70 mm 1/

5 . 0.5 gm of H gas diffused through a porous pot in 10 minutes. Under the same conditions how many grams of oxygen will diffuse through the same pot? 1)0.15 gm ) 1 gm 3) gm ) gm 5. The ratio of rates of diffusion of SO, O and CH is 1.1 : : ) 1 : : 3) : : 1 ) 1 : : 6) 50ml of gas diffuses through a membrane in the same times as 0ml of a gas under identical pressure temperature conditions. If the molecular weight of is 6, then molecular weight of would be 1)100 ) 50 3) 00 ) xml of H gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions 1)10 seconds, He ) 0 seconds, O ) 5 seconds, CO ) 55 seconds, CO 8. Equal weights of two gases of molecular weight and 0 are mixed. The pressure of the mixture is 1.1 atm. The partial pressure of the lighter gas is this mixture is 1) 0.55 atm ) 0.11 atm 3) 1 atm ) 0.11 atm 9. lit of SO gas at 760 mm of Hg transferred to 10 lit flask containing oxygen at a particular temperature. The partial pressure of SO in the flask is 1) mm of Hg ) 15 mm of Hg 3) 760 mm of Hg ) 1330 mm of Hg 30. gm of Helium diffuses from a porous membrane in minutes. How many grams of CH would diffuse through the same membrane in same time under similar conditions 1) 8 gm ) gm 3) 16 gm ) gm

6 31. t what temperature will the rate of diffusion of N be 1.6 times the rate of diffusion of SO at 7C? 1) 336C ) 7C 3) 63C ) 50C Hint: r T M r M T In a gaseous mixture at 5 atmospheric pressure, 30% of molecules ofco, 0% of molecules of N and the rest oxygen. The partial pressure of oxygen in the mixture is 1)11.5 atmosphere ) atmosphere 3) 1. atmosphere ) 1.6 atmosphere 33. Equal volumes of two jars contain mmonia and Hydrochloric gases respectively at constant temperature and pressure. when one of the jars is inverted over another jar so that they mix up, the pressure in either of the jars is 1) Equal to ) + = 3) / ) ecomes Zero Hint: oth combine to form solid mmonium chloride 3. The pair of gases which possess same rate of diffusion 1) CO, N ) C H 6, N 3) CH, O ) CO, N 35. Dalton s law of partial pressures is applicable to a mixture of 1) NH 3 + HCl ) CH + F 3) CO + Cl ) CO + N 36. Equal weights of CH and O are present in a vessel. So their partial pressures are in the ratio 1) : 1 ) 1: 3) : 3 ) 3: 1 Hint: 1:=n1:n 37. Which of the following is not an application of Graham s law? 1) Separation of isotopes of Uranium ) Working of marsh gas alarm 3) Steam distillation ) Separation of a gaseous mixture

7 38. Which among the following is true? 1) CO diffuses 1.5 times faster than SO ) CH diffuses times faster than O 3) He diffuses times faster than CH ) H diffuses times faster than He 39. tmolysis is based upon 1) Dalton s law ) Charles s law 3) Graham s law ) oyle s law 0. Dry NH 3 and HCl gas are introduced from either side of glass tube of length 100 cm. The white fumes are formed nearly at length from NH 3 end 1) 0 cm ) 50 cm 3) 60 cm ) 80 cm 1. Molecular weights of gases are in the ratio 36: 9. Then the ratio of diffusion of their rates will be 1) 6: 7 ) 7: 6 ) 18:.5 ).5: 18. vessel contains oxygen and hydrogen in the molecular ratio of : 1 at a pressure of 30 atm. If a small leak is developed in the vessel, the composition of the gas mixture that effuses out initially (O :H ) 1) 1: ) : 1 3) 1: ) 3: 1 3. If 0 ml of SO diffuses in 5 sec under certain conditions the volume of He that will be diffused in same time under same conditions is 1) 160 ml ) 100 ml 3) 80 ml ) 0 ml

8 KEY 1) )1 3)1 )1 5) 6) 7)3 8) 9)3 10)1 11)3 1) 13)3 1)3 15)3 16) 17) 18)1 19)3 0) 1) ) 3)1 )3 5)1 6)1 7) 8)3 9) 30) 31)3 3)1 33) 3) 35) 36)1 37)3 38)3 39)3 0)3 1) )3 3)3

Under ideal conditions, the rates at which different gases diffuse (spread out) are proportional to their molar masses.

Chemistry Ms. Ye Name Date Block Graham s Law of Diffusion- Under ideal conditions, the rates at which different gases diffuse (spread out) are proportional to their molar masses. In other words, gas molecules