Chemistry Class-11: Chapter –5. States of Matter Part – 3

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Question: 13

How does the surface tension of a liquid vary with increase in temperature?

(i) Remains same

(ii) Decreases

(iii) Increases

(iv) No regular pattern is followed

Answer: (ii)

II. Multiple Choice Questions (Type-II)

In the following questions two or more options may be correct.

Question: 14

With regard to the gaseous state of matter which of the following statements are correct?

(i) Complete order of molecules

(ii) Complete disorder of molecules

(iii) Random motion of molecules

(iv) Fixed position of molecules

Answer: (ii), (iii)

Question: 15

Which of the following figures does not represent 1 mole of dioxygen gas at STP?

(i) grams of gas

(ii) litres of gas

(iii) dioxygen molecules

(iv)

Answer: (i), (iv)

Question: 16

Under which of the following two conditions applied together, a gas deviates most from the ideal behaviour?

(i) Low pressure

(ii) High pressure

(iii) Low temperature

(iv) High temperature

Answer: (ii), (iii)

Question: 17

Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?

(i) Decreasing the quantity of water

(ii) Adding salt to water

(iii) Decreasing the volume of the vessel to one-half

(iv) Decreasing the temperature of water

Answer: (ii), (iv)

III. Short Answer Type

Question: 18

If 1 gram of each of the following gases are taken at STP, which of the gases will occupy (a) greatest volume and (b) smallest volume?

Answer:

Question: 19

Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states?

Answer:

Remains the same i.e., .

Question: 20

The behaviour of matter in different states is governed by various physical laws. According to you what are the factors that determine the state of matter?

Answer:

Pressure, temperature, mass and volume

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