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Standard VI

Chemistry

Physical Change

On continuous...

Question

On continuous application of heat, an iron rod is converted from the solid into the liquid state. This phase transition is called ___.

Evaporation

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Condensation

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Melting

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None of the above

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Solution

The correct option is C
Melting

Melting:- The phase transition from solid to the liquid state on heating is known as melting.

On continuous application of heat, the iron rod will get softer and gradually will convert into the liquid state.

Evaporation:- It is a phase transition process in which the liquid converts into gas on heating.

Condensation:- It is a phase transition process in which the gas converts into liquid on cooling.

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Similar questions

Q. Assertion :Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Reason: Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance

Select the correct alternative:

(a) The inter-molecular force is maximum in :

(i) solids (ii) gases

(iii) liquids (iv) none of the above.

(b) The inter-molecular space is maximum in :

(i) liquids (ii) solids

(iii) gases (iv) none of the above.

(i) gases (ii) liquids

(iii) solids (iv) none of the above

(d) The molecules move only within the boundary of :

(i) liquids (ii) gases

(iii) solids (iv) none of the above

(e) The temperature at which a liquid gets converted into its vapour state is called its :

(i) melting point (ii) boiling point

(iii) dew point (iv) freezing point

(f) Rapid conversion of water into steam is are an example of:

(i) evaporation (ii) freezing

(ii) melting (iv) vaporization

(g) Evaporation takes place from the :

(i) surface of liquid

(ii) throughout the liquid

(iii) mid-portion of the liquid

(iv) bottom of the liquid

(h) Boiling takes place from:

(i) the surface of the liquid

(ii) throughout the liquid

(iii) mid-portion of liquid

(iv) none of the above

The phase transition in which a liquid turns into a solid is called _________.

Q. The temperature at which a solid is converted into liquid, is called its melting point.

Fill in the blanks:

(a) Evaporation takes place at___ temperature.

(b) ___process is just the reverse of melting.

(d) The temperature at which a solid convert into a liquid is called its___

(e) The smallest unit of matter that exists freely ni nature is called___

(f) Molecules of a substance are always in a state of___ and so they possess ___

(g) Inter-molecular space is maximum in ___less in ___and the least in ___

(h) Inter-molecular force of attraction is maximum in___less in ___and the least in ___

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