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1) The process in which the solid changes directly into vapors without changing in the liquid state is called a. condensation b. evaporation c. boiling d. sublimation
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2) Conversion of a liquid to a gas at all temperatures is called a. sublimation b. evaporation c. condensation d. boiling
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3) The temperature at which the solid starts melting is called a. boiling point b. freezing point c. melting point d. sublimating point
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4) At constant pressure the average kinetic energy of gas molecules increases 2 times if a. temperature is increased by 2 times b. temperature is halved c. no change in temperature d. temperature remains constant
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5) The average kinetic energy of gas molecules is directly proportional to a. T2 b. √T c. T d. 2T
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6) The mathematical expression that describes Boyle's law is a. PV = constant b. V * constant = P c. P * constant = V d. V ⁄ P = constant
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7) For a certain reaction PV = 2 dm3 atm and volume is 4 dm3 then the corresponding pressure is a. 1 atm b. 4 atm c. 0.5 atm d. 2 atm
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8) The molecules of liquid which escape first have a. highest kinetic energy b. lowest kinetic energy c. moderate kinetic energy d. infinite kinetic energy
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9) The pressure that vapors apply on the surface of the liquid at equilibrium is called a. torr b. vapor pressure c. liquid pressure d. condensation
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10) On increasing the temperature of amorphous solid they a. melt at specific temperature b. soften gradually c. break at specific temperature d. boil at specific temperature
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