Boiling Point of Water (Viva Voce) : Class 9 : Chemistry : Amrita Online Lab

Boiling Point of Water

	1)	What is the boiling point of water at one atmospheric pressure?
		99°C 100°C 104°C 110°C

	2)	How does the presence of impurities affect the boiling point of water?
		Increases it. Remains the same. Decreases it slowly. Decreases it rapidly.

	3)	What is the temperature called at which vapour pressure becomes equal to atmospheric pressure?
		Freezing point Boiling point Melting point Sublimation temperature

	4)	What is the boiling point of water at altitudes above sea level?
		100°C >100°C less than 100°C >150°C

	5)	What is the effect of decrease of pressure on the boiling point of water?
		Boiling point decreases. Boiling point increases. Boiling point remains the same. Boiling point first increases, then decreases.

	6)	Boiling chips are added to the liquid while boiling. This is to………………..
		Increase the boiling point of the liquid Decrease the boiling point of the liquid Prevent bumping of liquid Save time

	7)	Evaporation causes which of the following?
		Heating. Cooling. Both heating and cooling. Nothing.

	8)	Water is boiled at three different places- A, B & C, whose altitudes are in the order of 500(ft), 1000(ft) & 4000(ft) above the sea level. Which among the following is the correct observation?
		Boiling point of water will be highest at place A. Boiling point of water will be highest at place B. Boiling point of water will be highest at place C. Boiling point of water will be the same at all the three places.

	9)	What does the boiling point of a liquid depend upon?
		Room temperature. Atmospheric pressure. Solubility in water. Colour.

10)

Which one of the following experimental arrangements is correct for the determination of boiling point of water?

Developed by Amrita Vishwa Vidyapeetham & CDAC Mumbai. Funded by MeitY (Ministry of Electronics & Information Technology)