States of matter, change of state, evaporation, latent heat, diffusion.
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Q1 · Matter in Our Surroundings · EASY
A student observes that naphthalene balls kept in a cupboard gradually decrease in size and eventually disappear without leaving any liquid. Which property of matter explains this observation?
Q2 · Matter in Our Surroundings · MEDIUM
During summer, a water cooler is kept in an open area. Water is filled in an earthen pot and it is observed that the outer surface of the pot remains moist and the water inside becomes cooler. The temperature of water inside is 5 degree Celsius lower than the surrounding temperature. What is the primary reason for this cooling effect?
Q3 · Matter in Our Surroundings · HARD
An experiment is conducted where 100 g of ice at 0 degree Celsius is converted to water at 0 degree Celsius. Later, 100 g of water at 100 degree Celsius is converted to steam at 100 degree Celsius. Given that latent heat of fusion of ice is 80 cal/g and latent heat of vaporization of water is 540 cal/g, compare the heat energy required in both processes. What is the ratio of heat required to convert ice to water to the heat required to convert water to steam?
Q4 · Matter in Our Surroundings · EASY
At what temperature does water exist in all three states of matter simultaneously under normal atmospheric pressure?
Q5 · Matter in Our Surroundings · EASY
At 100°C and 1 atm pressure, which of the following statements about water is correct?