Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 3

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A sample of gas at $35 ° C & 1 atm$ pressure occupies a volume of $3.75$ litres. At what temp. should the gas be kept if it is required to reduce the volume to $3$ litres at the same pressure :

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Important Questions on States of Matter: Gases and Liquids

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 4

The best vaccum so far attained in laboratory is

10^{- 10} mm

of

Hg

. The number of molecules of gas remain per

{cm}^{3}

at

20 ° C

in this vaccum is :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 5

A hydrocarbon contains

10.5 g

of carbon per

gm

of

H

. One litre vapours of hydrocarbon at

127 ° C

and

1

atm pressure weighs

2.8 g

. The molecular formula of hydrocarbon is :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 6

120 g

of an ideal gas of molecular weight

40

are confined to a volume of

20

litre at

400 K

, then the pressure of gas is :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 7

A cylinder contains acetylene gas at

27 ° C

and

4.05 MPa

. The pressure in the cylinder after half the mass of gas is used up and temperature has fallen to

12 ° C

will be :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 8

The weight of

350 mL

of a diatomic gas at

0 ° C

and

2

atm pressure is

1 g

. The weight in

g

of one atom at

NTP

is :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 9

Oxygen is present in a litre flask at a pressure of

7.6 \times 10^{- 10} mm

of

Hg

. The number of oxygen molecules in the flask at

0 ° C

is :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 10

The

r . m . s .

velocity of hydrogen at

27 ° C, R = 8.314 J {mol}^{- 1} K^{- 1}

is :

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Beta Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>EXERCISE-1>Q 11

The

R . M . S .

speed of the molecules of a gas of density

4 kg m^{- 3}

and pressure

1.2 \times 10^{5} N m^{- 2}

is: