EASY
Earn 100

The melting point of ice is?

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Important Questions on Matter in our Surroundings

MEDIUM
Useful substance in preparation of freezing mixture is 
MEDIUM
Which gas boils out first during fractional distillation of air.
EASY
"Complete melting of ice cream will not happen suddenly". Explain.
MEDIUM
Which of the following curves best represents the variation in density of water with temperature?
MEDIUM

When does ice melt at the same temperature 0°C(273 Kelvin), which one of the following has more energy?

HARD
The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.
MEDIUM

Convert the following temperatures to the Kelvin scale:

a. 25°C

b. 373°C

EASY

Define the latent heat of fusion of ice. Give its value.

MEDIUM
Define the latent heat of vaporisation of water. Give its value
MEDIUM
Why is ice at 273 K more effective in cooling than water at the same temperature?
EASY
The temperature at which a solid melts to become a liquid at the atmospheric pressure is called _______.
HARD

Why is steam at 100°C a more effective heating agent than water at 100°C?

EASY
What is the physical state of water at 250oC  ?
MEDIUM
The amount of heat energy required to change 1 kg of solid into liquid at its melting point is called -
MEDIUM
When we observe the melting of ice, the melting point of ice is a constant temperature at which
HARD

Why does the temperature remain constant during the change of state?

EASY
The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as _______.