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Melting Point of Ice
Melting Point of Ice
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1)
What is the melting point of ice at 1 atmospheric pressure?
273 K
373 K
231 K
100 K
2)
Which of the following is the correct method for finding the melting point of ice?
3)
What is the process by which a solid changes into a liquid?
Evaporation
Fusion
Sublimation
Condensation
4)
At room temperature (30°C) a student sets up an apparatus to determine the melting point of ice. The student takes a beaker half filled with ice and dips a mercury thermometer in it. What is the correct observation?
Mercury in the thermometer keeps on falling till it reads -1°C. It remains constant thereafter.
Temperature falls, reaches 0°C, then it remains constant even after all the ice has melted.
The temperature falls at the beginning, but starts rising as soon as the ice starts melting.
Temperature falls, reaches 0°C and remains constant only as long as both ice and water are present in it.
5)
What is the temperature at which a substance changes from the solid state to the liquid state?
Boiling point
Freezing point
Melting point
Triple point
6)
What is the effect of an increase in pressure on the melting point of ice?
Melting point decreases.
Melting point increases.
Melting point will first increase, then decrease.
Melting point first decrease, then increase.
7)
How does the presence of an impurity affect the melting point of a compound?
Increases sharply.
No change.
Slightly increases.
Decreases.
8)
Why do you stir the ice pieces using a glass rod while heating?
To reduce the temperature
To increase the temperature
To slow down the melting of ice
To keep a uniform temperature throughout
9)
The following pictures represent the determination of melting point of ice. Which one shows the correct thermometer reading?
10)
The following precautions were listed for the experiment to determine the melting point of ice. Which is the incorrect precaution?
The bulb of the thermometer should be kept surrounded with crushed ice.
Ice should be stirred regularly to keep a uniform temperature throughout.
The final temperature should be noted by keeping the eyes in line with the level of mercury.
Only the tip of the bulb of the thermometer should just touch the crushed ice.