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 Multiple Choice QuestionsShort Answer Type

71.

Why mercury is generally used as a liquid in barometer?

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 Multiple Choice QuestionsLong Answer Type

72.

State Boyle's law. How this law is expressed mathematically?

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73.

How will you represent the Boyle's law graphically in different ways?


This law can be represented in three ways:

(i) Graph between P (pressure) and V (volume):

If a graph is plotted between P and V of gas at a particular temperature, a curve of the form of the regular hyperbola is obtained. This shows that volume is inversely proportional to pressure. 

(ii) Graph between P (pressure) and  : (1/volume):

If a graph is plotted between P and 
a straight line is obtained which shows that pressure and volume are inversely related to each other. 

(iii) Graph between P(pressure) and PV (Product of pressure and volume):

If a graph is plotted between P and PV, a horizontal straight line is obtained. This illustrates the relationship
PV = constant.
These curves plotted at particular temperature are known as isotherms.

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 Multiple Choice QuestionsShort Answer Type

74.

Why does the volume of a gas decrease on increasing pressure?

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75.

A weather balloon has a volume of 175 L when filled with hydrogen at a pressure of 1.00 bars. Calculate the volume of the balloon when it rises to a height of 2000m, where the atmospheric pressure is 0.80 bar. Assume that the temperature is constant ?

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76.

A balloon is filled with hydrogen at room temperature. It will burst if the pressure exceeds 0.2 bar. If at 1 bar pressure, the gas occupies 2.27 L volume, up to what volume can the balloon be expanded?

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77.

What will be the minimum pressure required to compress 500 dm3 of air at 1 bar to 200 dm3 at 30C?

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 Multiple Choice QuestionsLong Answer Type

78.

A vessel of 120 mL capacity contains a certain amount of gas at 35°C and 1·2 bar pressure. The gas is transferred to another vessel of volume 180 mL at 35°C. What would be its pressure ?

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 Multiple Choice QuestionsShort Answer Type

79.

A gas occupies a volume of 300 mL at 740 mm Hg at 20°C. What additional pressure is required to reduce the gas volume to 250 ml at 20°C?

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80.

What pressure must be applied to a given sample of a gas in order to compress it to three-fourth of its original volume ?

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