Question

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Q . 1for any substance, why cloes the temperature
remains constant during the change of state ?
Q.2 Suggest the method to liquefy atmospheric
gases.
Q.3 Naphthalene ball disappears with time without
leaving any solid . Give reason.
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Answer 1

1. Temperature of any substance remains constant because the heat supplied to increase the temperature is utilised in changing the state of matter. this is because of latent heat. The Brainliest Answer! Since the heat is used to overcome the force of attraction, the temperature of the substance does not change.
2. The gases can be converted into liquids by bringing its particles closer so atmospheric gases can be liquefied either by decreasing temperature or by increasing pressure.

    3.Naphthalene balls disappear with time without leaving any solid because                       they  undergo sublimation i.e., they directly change into vapour without passing through the liquid state. ... The perfumes contain solvent which carries pleasant smelling vapour.

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Answer 2

Answer:

Q3: Napthalene balls disappear with time without leaving any residue due to sublimation

Explanation:

Q2. The method to liquefy atmospheric gases is by highly compressed by decreasing temperature. The gases will change in liquid form and then we can separate them according to their boiling point.

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