Free Evaporation, Boiling Point and Vapour Pressure MCQs with Answers

• A. 100 0C
• B. 69 0C
• C. 98 0C
• D. 102 0C

Explanation: b) 69 CExplanation: This option suggests that the boiling point of water at Mount Everest is 69°C.

• A. Barometer
• B. Manometer
• C. Thermometer
• D. Sphygmometer

Explanation: A manometer is used to measure the vapor pressure of a liquid.

• A. Supply of heat in the start
• B. Supply of heat constantly
• C. Supply of heat at the end
• D. Supply of heat variably

Explanation: Boiling needs a continuous and constant heat supply. As a liquid is heated, the kinetic energy of its molecules increases, and hence the…

• A. Higher atmospheric pressure
• B. Weak hydrogen bonding
• C. No change in atmospheric pressure
• D. Lower atmospheric pressure

Explanation: Boiling point of water is lower at higher altitudes due to the decreased atmospheric pressure

• A. 817 mm of Hg
• B. 792 mm of Hg
• C. 830 mm of Hg
• D. 724 mm of Hg

Explanation: This is the following solution: Pressure in the jar =830 mm of Hg.Pressure of moisture =30 mm of Hg.Pressure of dry gas =830−30=800 mm of…

• A. Static equilibrium
• B. Dynamic equipment
• C. Dynamic equilibrium
• D. None

Explanation: A state in which the forward and reverse reactions of a chemical equation are happening at the same rate.The concentrations of the…

• A. boiling
• B. Freezing
• C. Evaporation
• D. Condensation

Explanation: This spontaneous change of a liquid into its vapours is called evaporation and it continues at all temperatures.

• A. Temperature
• B. Nature of liquid
• C. Intermolecular forces
• D. All

Explanation: Factors Of Vapor Pressure: Vapour pressure depends on : * Temperature * Nature of liquid * Intermolecular forces Temperature: * Higher…

• A. Xe
• B. Br2
• C. CH4
• D. All same

Explanation: Vapour pressure is the pressure exerted by a vapour in equilibrium with its solid or liquid form at a given temperature.

• A. CH4
• B. Br2
• C. Xe
• D. All same

Explanation: Vapour pressure is the pressure exerted by a vapour in equilibrium with its solid or liquid form at a given temperature.

• A. N pentane
• B. Isopentane
• C. Neo pentane
• D. All same

Explanation: . The intermolecular forces in n-pentane are weaker than those in isopentane and neopentane.

• A. Temperature
• B. Size of molecules
• C. Intermolecular force
• D. Surface area

Explanation: Vapour pressure is a thermodynamic property of a liquid that measures the tendency of its molecules to escape into the gas phase.

• A. Temperature
• B. Intermolecular force
• C. Surface area
• D. All

Explanation: Vapour pressure is inversely proportional to the strength of intermolecular forces.

• A. Water
• B. Ammonia
• C. Glucose
• D. All

Explanation: The boiling point of a substance is determined by the intermolecular forces between the molecules of that substance.The glucose molecules…

• A. 4.63 torr
• B. >4.630 torrs
• C. <4.73 torr
• D. 47.07

Explanation: The increase is from 527.8 torr to 760 torr when temperature changes from 90°C to 100°C.

• A. Water
• B. Glycerol
• C. Isopentane
• D. All same

Explanation: The vapor pressure of a liquid is directly proportional to the strength of the intermolecular forces between the molecules in the liquid.

• A. Mount everest
• B. Siachen
• C. K2
• D. Gwadar

Explanation: Atmospheric Pressure is directly proportional to the Boiling Point of liquid.Gwadar is at sea level so it has highest value of boiling…

• A. Surface phenomenon
• B. Continuous
• C. Exothermic
• D. Endothermic

Explanation: The opposite of evaporation is condensation, which is the process of a gas changing into a liquid.

• A. 300mmHg
• B. 350 mmHg
• C. 760mmHg
• D. 760 atm

Explanation: For water, the vapour pressure reaches the standard sea level atmospheric pressure of 760 mmHg/760torr/1atm at 100°C.

• A. Diethyl ether
• B. Ethanol
• C. Water
• D. All same

Explanation: Diethyl ether has the maximum volatility. Volatility is a measure of how easily a substance changes from a liquid to a gas.