Why is ice at 273 K more effective in cooling than water at the
same temperature?
Give two reasons to justify—
(a) water at room temperature is a liquid.
(b) an iron almirah is a solid at room temperature.
Arrange the following substances in increasing order of forces
of attraction between the particles— water, sugar, oxygen.
Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving
any solid.
(b) We can get the smell of perfume sitting several metres
away.
Convert the following temperatures to the kelvin scale.
(a) 25°C
(b) 373°C
Convert the following temperatures to the celsius scale.
(a) 293 K (b) 470 K
Why are we able to sip hot tea or
milk faster from a saucer rather
than a cup?
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