John was playing with ice cubes and he infer that the ice can be changed into water and he concluded that matter around us change state from solid to liquid and from liquid to gas on application of heat but he notices that over a period of time naphthalene balls kept in the cupboard are disappeared and size of the camphor cubes are reduced without changing into liquid state.
(a) Why naphthalene balls kept in the cupboard disappear
i) due to moth ii) due to clothes iii) due to change in temperature iv) None of these
(b) Name two sublimes from the passage.
i) water and naphthalene ii) naphthalene and ice iii) Ice and camphor iv) naphthalene and camphor
(c) Matter around us change from solid to liquid and from liquid to gas on application of heat due to
i) increase in kinetic energy of particles of matter ii) increase in intermolecular space between particles of matter iii) decrease in force of attraction between particles of matter iv) All of the above
Answers
Answer:
(a) iii) due to change in temperature (b) iv. napthalene and camphor (c) iv) all of the above
Answer:
Ans a.) iii) due to change in temperature.
➙ Naphthalene balls kept in the cupboard disappear because on heating naphthalene balls goes under the process of sublimation. So, eventually when the temperature inside the cupboard increase or they are exposed to open air, they sublimate.
Ans b.) iv.) Naphthalene and camphor are the two sublimes from the passage.
Ans c.) iv) All of the above.
➙ We know that Matter around us change from solid to liquid and from liquid to gas, which means it changes from one form to another. The reason can be among the following either kinetic energy of particles has increased, or due to increase in intermolecular spaces and eventually decrease in intermolecular spaces between the particles.
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