Gaseous and liquid states Questions and Answers

Which will make basic buffer 2019 a 50 mL of 0 1 M NaOH 25 mL of 0 1 M CH COOH b 100 mL of 0 1 M CH COOH 100 mL of 0 1 M NaOH c 100 mL of 0 1 M HCl 200 mL of 0 1 MNH OH d 100 mL of 0 1 M HCl 100 mL of 0 1 M NaOH

A plot of volume V versus temperature T for a gas at constant pressure is a straight line passing through the origin The plots at different values of pressure are shown in figure Which of the following order of pressure is correct for this gas Volume mL P a P P P P c P P P P P P P Temperature K b P P P P

N2 3H 2NH3 1 mole of N and 4 moles of H are taken in 15 L flask at 27 C After complete conversion of N into NH3 5 litres of water is added What is the pressure set up in the flask A B G 4 926 atm 3 284 atm 1 643 atm

Determine the equilibrium constant of the following reaction CO g 2H g AH 128 kJ mol The equilibrium concentrations of CO H and CH3OH are 0 02 M 0 06 M and 0 01 M respectively CH OH CH3OH g Define the shift of the equilibrium for the following reaction in case of a Increase of temperature Explain your answer b Decrease of pressure Explain your answer

108 The volume vs temperature graph of 1 mole of an ideal gas is given below X 50 Volume L 40 30 20 100 Z 200 300 400 Y 500 Temperature K The pressure of the gas in atm at X Y and Z respectively are 0 328 0 820 0 820 b 3 28 8 20 3 28 c 0 238 0 280 0 280

Cl O gas decomposes as Cl 07 g Cl g O g A partially decomposed gaseous mixture is allowed to effuse through a pin hole and the gas com out initially was analysed The mol fraction of the O was found to be 0 6 determine the degree dissociation a 40 b 30 c 20 d 10

2 Copper forms two oxides For the same amount of copper twice as much oxygen was used to form the first oxide than to form the second one What is the ratio of the valencies of copper in the first and second Oxides Hint Assume that the oxides are Cu O and Cu O and apply Rule 6 2 1

1000 mol of ammonia is isothermally compressed from 5 to 0 5 m at 300 K Calculate the work in this process if the change of pressure with volume obeys the following equation a P RT V b V m Note a 423 3 kPa and b 0 0373 m kmol kmo Answer W 5155 86 kJ solve it using the formula W integral of P dV from interval V to Vf

The reduced volume and reduced temperature of a gas are 10 2 and 0 7 respectively If its critical pressure is 4 25 atm then its pressure will be a 0 6816 atm b 0 6618 atm d zero AMU Med c 0 8616 atm 9 NO

23 Four one litre flasks are separately filled with the gases CO F2 NH3 and He at same room temperature and pressure The ratio of total number of atoms of these gases present in the different flasks would be 1 1 1 1 1 3 3 2 4 1 2 1 2 2 3 4 2 1 3 2 16 21 26

4 One mole of ideal gas goes through process P 2V2 1 V2 Pa then change in temperature of gas when volume changes from V 1m to 2 m is 1 3 4 5R 5 K K 2R 11 2 5R 4 2K K

A gas filled weather balloon with a volume of 65 0 L is held at ground level at an atmospheric pressure of 732 mmHg and a temperature of 22 0 C The balloon is released and rises to about 18 000 m where the temperature is 4 35 C and the balloon has expanded to 852 L Calculate the pressure at the higher altitude a 61 288 torr b 61 3 mmHg c 50 885 mmHg d 10530 torr e 50 9 torr

A liquid is kept in a closed vessel If a glass plate negligible mass with a small hole is kept on top of the liquid surface then the vapour pressure of the liquid in the vessel is A More than what would be if the glass plate were removed B Same as what would be if the glass plate were removed Less than what would be if the glass plate were removed

4 Na Fe Cr Co 2 An electron in a hydrogen atom in its ground state absorbs energy equal to the ionisation energy of Li The wavelength of the emitted electron is 1 3 32 x 10 10 m 3 3 33 pm 2 1 17 4 None of these

ENGLISH Q No 55 Single Correct A A Marks 4 00 1 0 x g is the amount of a gas adsorbed by mg of a solid If multilayer adsorption is supposed to occur then which of the following statement is correct A B C D At low pressure x m increases more than proportionally to gas pressure At low pressure x m increases less than proportionally to gas pressure At moderate pressure x m increases more than proportionally to gas pressure At high pressure x m becomes independent of gas pressure

For a strong electrolyte the difference between molar conductivity Am and limiting molar conductivity A is equal to A Ac B Ac C Acalleol D Ac 2 where A is a constant and c represents concentration

au Find the temperature at which 3 moles of SO will occupy 3 O 1510 1 a volume of 10 litres at a pressure of 15 atms a 6 71 atm lit mol 2 b 0 0564 lit mol 1 350 5724 C 2 250 5724 C 3 150 5724 C m 3 P 1504 V 1024 273 4 450 5724 C The ability of an ion to bring about coagulation of a given 2 267 PARA a 6 71 atm lit mol 2 b 0 0564 lit mol 1 1 350 5724 C 2 2 250 5724 C 3 150 5724 C 4 450 5724 C 1 PVC MRT X5 X 80 x 3 x 3X25 Hafan find PCBZ 1 to 3 z

The product of PV is plotted against P at two temperatures T and T2 and the result is shown in the figure What is correct about T and T PV A B C D P bar T1 T2 T2 T1 T1 T T T2 1 T T

P Two identical bulbs containing ideal gases A and B are taken 67 A Density of A is twice that of B Mol wt of A is half that of B If the two gases are at the same temperature the ratio of pressure of A and B is 1 1 2 2 1 4 3 4 1 4 2 1 P PA PB SRR MW 21 IXA B B 1 1 2 2 1 4 lass XIII Spartan A 25 3 4 1 4 2 1 The gas phase reaction 2NO g N O g is an 68 taff N MB B S MB

fritt fo 62 If P V M T and R are pressure volume molar mass 62 P V M TUR 23 314 CR 504414 temperature and gas contant respectively then for an ideal gas the density is given by 3 1 2 3 RT PM 4 RT E 87 5 87 5 g 375 6 195x 7000XX 76562 1 2 RT RT 3 V P SRT MW PM RT 50 251 2 3016 80 32 2048x2 PM RT RT The rate constant for a first order reaction at 300 C 63 300 C f fe at 3711 af E 35 KCal for WE

Half liter each of three samples of H O labeled as 10 vol 15 vol and 20 vol are mixed and then each diluted with further half liter of water The volume strength of resultant H O solution is 1 5 5 2 6 5 3 7 5 85

4 2 marks At 400 K the reaction 1 N g 3H g 2NH3 g has A G 11 92 kJ mol Starting with a mixture of 1 0 moles of N 3 0 mole

Density of H g at 27 C at 0 25 gm lit If Vander waal s gas constant b for H is 0 5 lit mol the for H g A Compressibility factor Z 1 067 B Molar volume V 4 litre mole C Compressibility factor Z 1 26 D Molar volume V 8 litre mole

1 A solution containing 10 2 g glycerine per isotonic with a 2 solution of glucose What is the molecular mass of glycerine a 91 8 g b 1198 g c 83 9 g d 890 3 g nls exerted

35 A container of volume 2 24 L can withstand a maximum pressure of 2 atm at 298 K before exploding The maximum amount of nitrogen in g that can be safely put in this container at this temperature is closest to 26 a 2 8 c 1 4 b 5 6 d 4 2 und shown holow

A gas vessel is attached to an open end manometer filled with a non volatile liquid of density 0 993 g mL as shown below The difference in heights of the liquid in the two sides of the manometer is 32 3 mm when the atmospheric pressure is 765 mm Hg Given that the density of mercury is 13 6 g mL the pressure of the enclosed gas is atm Select one a 1 04 X b 0 993 c 1 05 d 1 08 e 1 01

PROBLEM 42 A careless student while determining the molecular weight of chloroform CHC13 found that 0 1008 g of the liquid displaced 19 00 mL of air at 16 5 C and 707 5 mm pressure Calculate the percentage error aq tension at 16 5 C 13 5 mm Ans 15 5

Which of the following statements is are correct At constant volume there will be no effect of changing T or P on mean free path Collision number increases on increasing temperature at constant volume If diffusion coefficient is proportional to mean free path and mean speed then on increasing absolute temperature of an ideal gas by four times and pre by two times diffusion coefficient of gas increases four times According to kinetic theory of gases between two successive colloisions a gas molecule travels in straight line path

For the ideal gas find the missing parameter in each part among P V T and n i P 0 8314 Pa V 6000 m T 300 K ii P 5 atm V 8 21 L T 200 K iii P 831 4 Pa V 5000 L T 250 K iv V 8 21 L T 500 K n 10 3 v V 100 m T 300 K n 3 vi P 831 4 Pa V 1000 L n 0 1 vii P 22 4 atm T 273 K 3 viii V 45 4 m T 2730 K TITUT n 5

A mixture containing 1 12 litre D and 2 24 litre of H at NTP is taken inside a bulb connected to another bulb through a stop cock with a small opening The second bulb is fully evacuated The stop cock is opened for a certain time and then closed The first bulb is now found to contain 0 10 g of D Determine the by weight of the gases in second bulb 41 66 58 33

9 A sample of nitrogen gas is bubbled through liquid water at 25 C and then collected in a volume of 750 cc The total pressure of the gas which is saturated with water vapour is found to be 740 mm at 25 C The vapour pressure of water at this temperature is 24 mm How many moles of nitrogen are in the sample 0 028

Answers bracketed with questions 1 1 g of helium gas is confined in a two litre flask under a pressure of 2 05 atm What is its temperature 200 K The density of H 01701

5 1 0 g of magnesium is burnt with 0 56 g O in a closed vessel Which reactant is left in excess and how much At wt Mg 24 0 16 1 Mg 0 16 g 2 02 0 16 g 3 Mg 0 44 g 4 0 0 28 g WOS LOVE LIR

Which of the following equations represent standard heat of formation of CH4 A C diamond 2H2 g CH4 g B C D C graphite 2H g CH4 g C diamond 4H2 g CH4 g C graphite 4H2 g CH4 g

0 0 g of gaseous ammonia and 6 50 g of oxygen gas are introduced into a previously evacuated 11 0 L vessel If the ammonia and oxygen then react to yield NO gas and water vapor what is the final ga pressure inside the vessel at 23 C I 1 84 atm IV 1 23 atm II 4 42 atm V 3 67 atm III 2 21 atm 22 49

4 none of these 102 At 298 K assuming ideal behaviour the average kinetic energy of a deuterium molecule is 1 Two times that of a hydrogen molecule 2 Four times that of a hydrogen molecule 3 Half of that of a hydrogen molecule 4 Same as that of a hydrogen molecule 105 TH tha 1 2 3 4 106

Consider the following compounds in the liquid form O2 HF H O NH3 H O2 CC14 CHCl3 C6H6 C6H5Cl When a charged comb is brought near their flowing stream how many of them show deflection a per the following figure

3 Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas AIEEE 2005 a The area under the distribution curve remains the same as under the lower temperature b The distribution becomes broader c The fraction of the molecules with the most probable speed increases d The most probable speed increases

Na Process Na Naj A In 1 energy released II energy absorbed In both I and II energy is released B In both 1 and II energy is absorbed D In 1 energy absorbed II energy released

From the given equation for a gas at 300 K 4 0 02P 0 001 P Calculate the molecular weight of gas in gm mole at very low pressur where P Pressure is in atm d density is in gm lit Given R 0 08 atm lit mol K

A bubble of air is underwater at temperature 15 C and the pressure 1 5 bar If the bubble rises to the surface where the temperature is 25 C and the pressure is 1 0 bar what will happen to the volume of the bubble AIPMT Mains 2011 1 Volume will become smaller by a factor of 0 70 2 Volume will become greater by a factor of 2 5 3 Volume will become greater by a factor of 1 6 4 Volume will become greater by a factor of 1 1

If 21 3 mg of metal B was used in the reaction 30 12 mL of H2 gas was produced The pressure of the H2 gas was 650 2 mm Hg Molar mass of metal B 20 9 g mol Determine the temperature of the gas at the time of the reaction in units of K

9 In van der Waals equation at constant temperature 300 K if a 1 4 atm L mol V 100 mL n 1 mole then what is the pressure of the gas a 42 atm c 500 atm b 210 atm d 106 atm 2018

131 A 200 ml flask having oxygen at 220 mm and a 300 mL flask having nitrogen at 100 mm are connected in such a way that O and N may combine in their volumes if temperature is kept constant Find the total pressure of the gaseous mixture 1 158 mm 2 138 mm 3 148 mm 4 168 mm

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively The molecular mass of A is 49 u Molecular mass of B will be AIPMT Prelims 2011 1 25 00 u 2 50 00 u

es of an ideal gas at 200 K is compressed reversibly and adiabatically untill final temperature reaches 250 K If molas nstant volume is 27 cal mol K find work 3050 cal 3550 cal 4050 cal

The volume of 2 8 g of carbon monoxide at 27 C and 0 821 atm pressure is R 0 0821 lit atm K mol 0 3 litre 1 5 litre 3 litre CORRECT ANSWER PI

s of an ideal gas at 200 K is compressed reversibly and adiabatically untill final temperature reaches 250 K If molar heat capacity at constant e is 27 cal mol K find work 50 cal 550 cal 050 cal

Which of the following statements about an ideal gas is incorrect The average kinetic energy of an ideal gas decreases when temperature increases O The pressure of an ideal gas will decrease when the volume is increased at constant temperature The molecules in an ideal gas are in constant random motion O The volume of an ideal gas will increase when the temperature is increased at constant pressure O A gas behaves ideally when the distance between gas molecules is large compared to the size of the molecule

ion 4 A flask of 2 dm capacity contains O at 101 325 kPa and 300 K The gas pressure is reduced to 0 1 Pa Assuming ideal behaviour answer the following i What will be the volume of the gas which is left behind ii What amount of O and the corresponding number of molecules are left behind in the