At 20 ∘ C , two balloons of equal volume and porosity are filled to a pressure of 2 atm , one with 14 kg N 2 and other with 1 kg of H 2 balloon leaks to a pressure of 1 / 2 atm in 1 hr , How long will it take for H 2 balloon to reach a pressure of 1 / 2 atm ?

At constant V and T for a gas P ∝ w Thus, for N 2 : P 1 = 2 atm , P 2 = 1 2 atm , at t = 1 hr , w 1 = 14 kg w 2 = ? ∵ P 1 P 2 = w 1 w 2 ; 2 1 / 2 = 14 w 2 ∴ w 2 = 14 4 kg N 2 ∴ mass of N 2 diffused = 14 - 14 4 = 42 4 = 21 2 kg Similarly, for H 2 : P 1 = 2 atm , P 2 = 1 2 atm , at t = t hr , w 1 = 1 kg , w 2 = ? ∵ P 1 P 2 = w 1 w 2 2 1 / 2 = 1 w 2 ∴ w 2 = 1 4 kg ∴ mass of H 2 diffused = 1 - 1 4 = 3 4 kg Now r N 2 r H 2 = M H 2 M N 2 for diffusion of N 2 and H 2 , w H 2 w N 2 × t N 2 t H 2 = M H 2 M N 2 3 / 4 21 / 2 × 60 t = 2 28 ( t N 2 = 1 hour = 60 minute) ∴ t = 16 minute

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$10 ml$ of a gaseous hydrocarbon was exploded with excess of $O_{2}$ . On cooling, the reaction mixture volume was reduced by $10 ml$ , while on adding $KOH$ , the volume was reduced by $20 ml$ . Molecular formula of hydrocarbon is:

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Important Questions on States of Matter: Gases and Liquids

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 15

A mixture of methane, propane and carbon monoxide contains

36.5 %

propane by volume. If its

200 ml

are burnt in excess of

O_{2}

, the volume of

{CO}_{2}

formed is :

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 20

A spherical balloon of

21 cm

diameter is to be filled with hydrogen at NTP from a cylinder containing the gas at

20 atm

and

27 ° C

. If the cylinder can hold

2.82

litres of water at NTP, calculate the number of balloons that can be filled up.

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 22

A column of Hg of 100 mm in length is contained in the middle of a narrow tube 1 m long which is closed at both ends. Both the halves of the tube contained air at a pressure of $760 \mathrm{mm}$ of Hg. By what distance (in $\mathrm{mm}$ ) will the column of Hg lie displaced if the tube is held vertical? Assume decrease in length of mercury column to be negligible, also take the process at constant temperature (isothermal process)

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 24

Two vessels whose volumes are in the ratio

2 : 1

contain nitrogen and oxygen at

2500 mm

and

1000 mm

pressures, respectively when they are connected together what will be the pressure of the resulting mixture (in meters)?

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 25

20^{\circ} C,

two balloons of equal volume and porosity are filled to a pressure of

2 atm,

one with

14 kg N_{2}

and other with

1 kg

H_{2}

balloon leaks to a pressure of

1 / 2 atm

1 hr,

How long will it take for

H_{2}

balloon to reach a pressure of

1 / 2 atm

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 29

A gas cylinder containing cooking gas can withstand a pressure of

14.9

atmosphere. The pressure gauze of cylinder indicates

12

atmospheres at

27 ° C

. Due to sudden fire in the building, the temperature starts raising. The temperature at which cylinder will explode is

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 30

What conclusion would you draw from the following graphs for an ideal gas?

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Alpha Question Bank for Engineering: Chemistry>Chapter 3 - States of Matter: Gases and Liquids>Exercise-2>Q 31

An open-ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Initially, manometer shows no difference in mercury level in both columns as shown in the diagram. After sparking $" A "$ dissociates according to the following reaction $A (g) ⟶ B (g) + 3 C (g) .$

If pressure of Gas $" A "$ decreases to $0.9 atm .$
(Assume temperature to be constant and is $300 K$ )

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10 ml of a gaseous hydrocarbon was exploded with excess of O2. On cooling, the reaction mixture volume was reduced by 10 ml, while on adding KOH, the volume was reduced by 20 ml. Molecular formula of hydrocarbon is:

Important Questions on States of Matter: Gases and Liquids

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$10 ml$ of a gaseous hydrocarbon was exploded with excess of $O_{2}$ . On cooling, the reaction mixture volume was reduced by $10 ml$ , while on adding $KOH$ , the volume was reduced by $20 ml$ . Molecular formula of hydrocarbon is: