HARD

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$30 mL$ of a sample containing $H_{2} (g)$ , ${CH}_{4} (g)$ and $C (g)$ required $35 mL$ of $O_{2}$ , for complete combustion. There was a contraction of $20 mL$ when the mixture was treated with $KOH$ . What is the composition of ${CH}_{4} (g)$ and $H_{2} (g)$ respectively in original mixture?

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Important Questions on States of Matter : Gases and Liquids

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

300 K

and

1 atm

15 mL

of a gaseous hydrocarbon requires

375 mL

air containing

20 % O_{2}

by volume, for complete combustion. After combustion, the gases occupy

345 mL

. Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure, the formula of the hydrocarbon is:
(Assume complete combustion of reactant)

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

16 mL

of a gaseous aliphatic compound

C_{n} H_{3 n} O_{m}

was mixed with

60 {mLO}_{2}

and sparked. The gas mixture on cooling occupied

44 mL

. After treatment with

KOH

solution the volume of gas remaining was

12 mL

. Deduce the formula of compound

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

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:

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

20 mL

of a mixture containing

C_{2} H_{2}

and

CO

was exploded along with

30 mL

of oxygen. The gases after the reaction had a volume of

34 mL

. On treatment with

KOH, 8 mL

of oxygen remained. Calculate the composition of the mixture.

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

10 ml

of gaseous hydrocarbon is exploded with

100 ml O_{2}

. The residual gas on cooling is found to measure

95 ml

of which

20 ml

is abosorbed by

KOH

and the reminder by alkaline pyrogallol. The formula of the hydrocarbon is:

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

The explosion of a mixture containing one volume of a gas being studied and

1

volume of

H_{2}

yielded

1

volume of water vapor and

1

volume of

N_{2}

, with the volumes measured under identical conditions. Find the formula of the gas under study.

MEDIUM

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

40 ml

of a mixture of

H_{2}

and

O_{2}

18 ° C

and

1 atm

pressure was sparked so that the formation of water was complete. The remaining pure gas had a volume of

10 ml

18 ° C

and

1 atm

pressure. If the remaining gas was

H_{2}

, the mole fraction of

H_{2}

in the

40 ml

mixture is:

MEDIUM

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

MEDIUM

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

0.2 mol

sample of hydrocarbon

C_{X} H_{Y}

yields, after complete combustion, with excess

O_{2}

gas,

0.8 mol {CO}_{2}

and

0.1 mol H_{2} O

. Hence, hydrocarbon is:

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

280 mL

of sulphur vapour at normal temperature and pressure weighs

3.2 g

. Determine the molecular formula of the sulphur vapour.

EASY

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

When $100 mL$ of an $O_{2} - O_{3}$ mixture was passed through turpentine, there was a reduction in volume by $20 mL$ . If $100 mL$ of such a mixture is heated, what will be the increase in volume (in ml) ?

[Hint: $O_{3}$ is absorbed by turpentine]

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

A mixture of oxygen and hydrogen is analysed by passing it over hot copper oxide through a drying tube. Hydrogen reduces $CuO$ according to the equation, $CuO + H_{2} \to Cu + H_{2} O$ ; the copper formed is then oxidised by oxygen as:

$Cu + \frac{1}{2} O_{2} \to CuO$
$100 {cm}^{3}$ of the mixture measured at $25 ° C$ and $750 mm$ yields $84.5 {cm}^{3}$ of dry oxygen measured at $25 ° C$ and $750 mm$ , after passing over $CuO$ and a drying agent. What is the mole per cent of $H_{2}$ in the mixture?

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

When 10 ml mixture of N₂, CO₂ and CO with mole %, 30 %, 40 % and 30 % respectively is combusted in Eudiometer tube and when resulting mixture is pass through Turpentine oil, contraction of 30 ml is observed and when remaining mixture is pass through KOH solution then contraction of x ml is observed, what is the value of x ?

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

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 :

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

Ten millilitres of a gaseous hydrocarbon was burnt completely in $80 mL$ of $O_{2}$ at $STP$ . The volume of the remaining gas is $70 mL$ . The volume became $50 mL$ on treatment with $NaOH$ . The formula of the hydrocarbon is:

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

$5.22 \times 10^{- 4} mol$ of a gas containing $H_{2}, O_{2}$ and $N_{2}$ exerted a pressure of $67.4 mm$ in a certain standard volume. The gas was passed over a hot platinum filament which combined $H_{2}$ and $O_{2}$ into $H_{2} O$ which was frozen out. When the gas was returned to the same volume, the pressure was $14.3 mm$ . Extra oxygen was added to increase the pressure to $44.3 mm$ . The combustion was repeated, after which the pressure read $32.9 mm$ . What was the mole fraction of $H_{2}, O_{2}$ and $N_{2}$ in the gas sample?

[Hint: $2$ volumes of $H_{2}$ combine with $1$ volume of $O_{2}$ . In the first combustion, $H_{2}$ is in excess, while in the second one, $O_{2}$ is in excess]

HARD

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

On passing

25 mL

of a gaseous mixture of

N_{2}

and

NO

over heated copper,

20 mL

of the gas remained. Calculate the percentage of each gases in the mixture.

EASY

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

Cotyledons are also called-

MEDIUM

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

25 ml

O_{2}

contracts to

20 m l

when subjected to silent electric discharge in an ozoniser. What further contraction would be observed if the partially ozonised oxygen is treated with oil of cinnamon (which absorbs ozone)? All volumes are reported at the same temperature and pressure.

MEDIUM

Chemistry>Physical Chemistry>States of Matter : Gases and Liquids>Eudiometry

For complete combustion of 5 L of an alkane, 25 L of oxygen is required. Which of the following is this alkane, if all volumes are measured at constant temperature and pressure?

30 mL of a sample containing H2(g), CH4(g) and C(g) required 35 mL of O2, for complete combustion. There was a contraction of 20 mL when the mixture was treated with KOH . What is the composition of CH4(g) and H2(g) respectively in original mixture?

Important Questions on States of Matter : Gases and Liquids

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$30 mL$ of a sample containing $H_{2} (g)$ , ${CH}_{4} (g)$ and $C (g)$ required $35 mL$ of $O_{2}$ , for complete combustion. There was a contraction of $20 mL$ when the mixture was treated with $KOH$ . What is the composition of ${CH}_{4} (g)$ and $H_{2} (g)$ respectively in original mixture?