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Gases Solutions - Chemistry Questions asked by Filo students

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What will be the percentage of dimerization of

61 g

. of benzoic acid in

1000 g

. of a solvent and producing a depression in freezing point of

2^{\circ} C

K_{1}

to be 6 . (J \& K CET 2018)

$72%$
$67%$
$43%$
$28%$

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1.0

molal solution with the lowest freezing point is that of :

$FeCl_{3}$
$KCl$
$HCl$
$MgCl_{2}$ .

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60 g

of non-electrolyte \&p non - volatile solecte is added to

180 g

of pure water due to tuis v.p. reduce from

300 mm

290 mm

m

massof solute. sol

\frac{300 - 290}{300} = \frac{n}{n + 10}

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A

B

have vapour pressure in the ratio

P_{A}^{\circ} : P_{B}^{\circ} = 1 : 3

at a certain temperature. Assume

A

B

form an ideal solution and the ratio of mole fractions of

A

B

in the vapour phase is

4 : 3

. Then the mole fraction of

B

in the solution at the same temperature is :

$\frac{1}{5}$
$\frac{2}{3}$
$\frac{4}{5}$
$\frac{1}{4}$

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pressure of benzene at

2 0^{\circ} C

for a solution containiag स

_{4}, w_{1} = 10

46 g

of toluene in torr is

$53.5$
$37.5$
25
50

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The vapour pressure of two liquids '

P

Q

' ate भe and 60 torr, respectively. The total vapour pressure 4 solution obtained by mixing 3 mole of

P

and 2 mole of 2 . would be

72 torr
140 torr

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- Which of the following liquid pairs shows a positive

20 torr

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4) a) A 10\% solition (by moss) of suense in water has a freereng. point of

269.15 K

calculate the freezeng point of

10%

of glacose of the freezeng point of pure water is

273 + 5 k

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30 g

(m = 60 g mol^{- 1})

is dissolved in

846 g

of water. Calculate the rapour pressure of water for this solution if vapove pressure of plire water at

248 k

23.8 mm Hg

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Question 10

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50 ml

of hydrogen diffuses out through a small hole of a vessel, in 20 minutes. The time taken by

40 ml

of oxygen to diffuse out is :

32 minutes
64 minutes
8 minutes
12 minutes

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Question 11

Views: 6,032

2.2

Calculate the mole fraction of benzene in solution containing

30%

by mass in carbon tetrachloride. Soln

30%

ω / w)

Igm of solution.

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Question 12

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Q1) find the pormality of

0.321 gm

. 250 modium Carbo son.

^{2}

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Question 13

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0.1

molal aqueovs Solition of a weak acid

4 X

30%

R_{f}

1.86 c / m

, the freering point of the Solution

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Question 14

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Gases are generally collected over water and therefore are moist. Pressure of dry gas can be calculated by subtracting vapour pressure of water from the total pressure of the moist gas which contains water vapours also. Pressure exerted by saturated water vapour is called aqueous tension. Aqueous tension of water at different temperatures is given in Table 5.3.

p_{Dry gas} = p_{Total}

- Aqueous tension (5.24)

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Question 15

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18 g

of glucose is present in

1000 g

of solvent, the solution is said to be :

(180.156)

1 molar
$0.1$ molar
$0.5$ molar
$0.1$ molal

Topic:

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Question 16

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The molarity of a solution of sodium chloride (mol wt.

= 58.5)

in water containing

5.85 g

of sodium chloride in

500 mL

of solution is :-

025

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Question 17

Views: 5,388

Q.1 ASolution prepared by dissceluing

8, 95 mg

of gene fragment in

35 ml

of water has an tespatic presswe of

0, 33 ster

2 S^{'} C

assuming that gene fragment isa neen-electralyet Calculate the malecular mass of gene fragment.

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Question 18

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2.4 Dapour Liquid solutions are formed whe

D_{ressure of : a gas, a liquid or a solid. Solut}

Liquid been discussed in Section 2.3.2 Solutions one or more volatile components one or more volatile components. of only binary solutions, tha components, namely, the solutio in liquids. 2.4.1 Vapour Let us consider a binary solutio Pressure of two components as 1 and 2. W Liquid-

components would evaporate a Liquid established between vapour ph Solutions vapour pressure at this stage vapour pressures of the two co partial pressures are related to components 1 and 2 respective The French chemişt, Fra quantitative relationship betwe the Raoult's law which states

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Question 19

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The depression of freezing point for

1 M

1 M

1 M

sodium chloride are in the ratio :

1 M

ถูดิอเ,

1 M ตรอยร

$1 : 2 : 3$
$3 : 2 : 2$
$1 : 1 : 2$
$2 : 2 : 3$

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Question 20

Views: 5,705

2. The rate of diffusion of methane at a given temperature is twice that of a gas

X

. The molecular weight of

X

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