Chemistry Class 9th

341: The rate of evaporation is ______ of temperature.

A) Directly proportional

B) Indirectly proportional

C) Both

D) None

342: Evaporation is a _____ process.

A) Cooling

B) Heating

C) Both

D) None

343: At high temperature rate of evaporation is ______?

A) Low

B) High

C) Normal

D) None

344: The number of molecule evaporating will be equal to the molecule coming back to ____?

A) Liquid

B) Solid

C) Gases

D) Plasma

345: Vapour pressure depends upon the ______?

A) Nature of liquid

B) Nature of gas

C) Nature of solid

D) Nature of plasma

346: Water has less vapour pressure than that of ____ at the same temperature.

A) Ethanol

B) Alcohol

C) Mercury

D) None

347: Small sized molecule can easily evaporate than _____?

A) Normal sized

B) Big sized

C) Both

D) None

348: At high temperature vapour pressure is ____ than at low temperature?

A) Lower

B) Higher

C) Normal

D) None

349: When a liquid is heated, its molecule ____ energy

A) Lose

B) Gain

C) Decrease

D) Increase

350: At 250C the vapour pressure of water is ______?

A) 18 mm of Hg

B) 30 mm of Hg

C) 40 mm of Hg

D) 50 mm of Hg

351: At 250C the vapour pressure of chloroform is ______?

A) 25 mm of Hg

B) 80 mm of Hg

C) 127 mm of Hg

D) 170 mm of Hg

352: Boiling point depends upon ____ pressure.

A) External

B) Internal

C) Both

D) None

353: When liquids are cooled vapour pressure of a liquid is _______?

A) Decrease

B) Increase

C) Less

D) More

354: Temperature of liquid and solids are coexist in dynamic equilibrium is called _____?

A) Freezing point

B) Boiling point

C) Melting point

D) None

355: Freezing point of water is _____?

A) 0.0

B) 100

C) 16.6

D) -116

356: The rate of diffusion of liquid is _____?

A) High

B) Low

C) Slow

D) Fast

357: Big sized molecule diffuse ______?

A) Slowly

B) Rapidly

C) Fastly

D) none

358: Liquids cannot expand ______?

A) Closely

B) Freely

C) Slowly

D) Rapidly

359: _____ is the third state of mater.

A) Increases

B) Decreases

C) Both

D) None

360: The ionic and covalent solids make network structure to form ____?

A) Micro molecules

B) Macro molecules

C) Both

D) None