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question_answer1) Out of \[C{{O}_{2}}\] and \[N{{H}_{3}}\] gases, which is expected to show more deviation from the ideal gas behaviour?
question_answer2) Can we apply Dalton's law of partial pressures to a mixture of carbon monoxide and oxygen?
question_answer3) Out of dry air and wet air, which is heavier?
question_answer4) Carbon dioxide is heavier than oxygen and nitrogen but it does not form the lower layer of the atmosphere. Explain.
question_answer5) Ammonia and hydrochloric acid gases are prepared at the two extreme corners in the laboratory. Which gas will reach first to a person in the centre of the laboratory?
question_answer6) Both \[{{N}_{2}}O\] and \[C{{O}_{2}}\] have similar rates of diffusion under same conditions of temperature and pressure. Explain.
question_answer7) The molecular speeds of gaseous molecules are analogous to those of rifle bullets ; why is then odour of the gaseous molecules not detected so fast?
question_answer8) Why are aerated water bottles kept under water during summer?
question_answer9) Liquid ammonia bottle is cooled before opening the seal. Explain.
question_answer10) Why are tyres of automobiles inflated to lesser pressure in summer than in winter?
question_answer11) The size of the weather balloon becomes larger and larger as it ascends up into higher altitude. Assign reason.
question_answer12) What would have happened to the molecular motion in a gas if the molecular collisions were not elastic?
question_answer13) Under what conditions do real gases show maximum deviation from ideal gas behaviour?
question_answer14) If the value of 'a' for a gas is zero, can it be liquefied?
question_answer15) Gases like \[C{{O}_{2}}\] and \[C{{H}_{4}}\] show more deviation from the ideal gas behaviour as compared to gases like \[{{H}_{2}}\] and He. Explain.
question_answer16) How will you justify that the collisions among the gas molecules are perfectly elastic?
question_answer17) What is the basic difference between boiling and evaporation?
question_answer18) Why does the boiling point of liquid rise on increasing pressure?
question_answer19) Drop of liquid assumes spherical shape. Why?
question_answer20) The level of mercury in a capillary tube is lower than the level outside when the capillary is inserted in mercury. Explain.
question_answer21) Water meniscus in a glass tube is concave while that of mercury is convex. Why?
question_answer22) Liquids like ether and acetone are kept in cool places.
question_answer23) Tea or coffee is sipped from a saucer when it is hot.
question_answer24) What is the effect of temperature on : (a) Density (b) Surface tension (c) Viscosity and (d) Vapour pressure of a liquid?
question_answer25) Name the liquid with higher vapour pressure in the following pairs: (a) Alcohol, glycerine (b) Petrol, kerosene (c) mercury, water.
question_answer26) If alcohol evaporates on your palm, it becomes cold. Why?
question_answer27) Arrange solid, liquid and gas in order of energy, giving reasons.
question_answer28) Why liquids have a definite volume but no definite shape?
question_answer29) Which type of intermolecular forces exist among the following molecules? (i)\[{{H}_{2}}S\]molecules (ii) \[{{H}_{2}}O\] molecules (iii) \[C{{l}_{2}}\] and \[CC{{l}_{4}}\] molecules (iv) \[Si{{H}_{4}}\] molecules (v) Helium atoms (vi) He atoms and \[HCl\] molecules
question_answer30) A gas is filled into a bulb connected to an open limb manometer. The level of mercury in the open arm is 24 cm lower than that in the other arm of the manometer. The atmospheric pressure is 740 mm. What is the pressure of the gas?
question_answer31) How do you convert (a) pressure in atmospheres into SI units? (b) temperature in °C to temperature in °F?
question_answer32) \[C{{O}_{2}}\] is heavier than \[{{O}_{2}}\] and \[{{N}_{2}}\] gases present in the air but it does not form the lower layer of the atmosphere. Why?
question_answer33) What type of graph will you get when PV is plotted against P at constant temperature.
question_answer34) At a certain altitude, the density of air is 1/10th of the density of the earth's atmosphere and temperature is -10°C. What is the pressure at that altitude? Assume that air behaves like an ideal gas, has uniform composition and is at S.T.P. at the earth's surface.
question_answer35) How is the partial pressure of a gas in a mixture related to the total pressure of the gaseous mixture?
question_answer36) Compare the rates of diffusion of \[^{235}U{{F}_{6}}\]and\[^{238}U{{F}_{6}}\].
question_answer37) \[{{N}_{2}}O\] and \[C{{O}_{2}}\] have the same rate of diffusion under same conditions of temperature and pressure. Why?
question_answer38) What would have happened to the gas if the molecular collisions were not elastic?
question_answer39) Represent the relative values of most probable speedy average speed and root mean square speed on Maxwell's distribution curve for speeds.
question_answer40) What is the relationship between average kinetic energy and the temperature of a gas?
question_answer41) What is the ratio of average kinetic energy of oxygen molecules to that of ozone molecules at 27°C?
question_answer42) What is the difference between total kinetic energy and translational kinetic energy? For what type of molecules, the two are equal?
question_answer43) Why in case of hydrogen and helium, the compressibility factor is always greater than 1 and increases with increase of pressure?
question_answer44) The van der Waals constants for two gases are as follows : Gas \[a\,(atm\,{{L}^{2}}\,mo{{l}^{-2}})\] \[b\,(L\,mo{{l}^{-1}})\] X 1.39 0.0391 Y 3.59 0.0427 Which of them is more easily liquefiable and which has greater molecular size?
question_answer45) Out of \[{{N}_{2}}\] and \[N{{H}_{3}},\] which one will have greater value for van der Waals constant 'a' and which one will have greater value for van der Waals constant 'b'?
question_answer46) At a particular temperature, why vapour pressure of acetone is less than that of ether?
question_answer47) A liquid is transferred from a smaller vessel to a bigger vessel at the same temperature. What will be the effect on the vapour pressure?
question_answer48) Why vegetables are cooked with difficulty at a hill station?
question_answer49) What is the difference between normal boiling pint and standard boiling point?
question_answer50) Explain why temperature of a boiling liquid remains constant?
question_answer51) What happens if a liquid is heated to the critical temperature of its vapours?
question_answer52) Why liquids diffuse slowly as compared to gases?
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