MEDIUM

Earn 100

Define the strength of a solution. Write its formula.

Important Questions on Some Basic Concepts of Chemistry

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

8 g

NaOH

is dissolved in

18 g

H_{2} O

. Mole fraction of

NaOH

in solution and molality (in

mol {kg}^{- 1}

) of the solution respectively are:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

The weight percent of sucrose (formula weight

= 342 g m o l^{- 1}

) in an aqueous solution is

3.42

. The density of the solution is

1 g m L^{- 1},

the concentration of sucrose in the solution in

m o l L^{- 1}

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

The molality of a $10 % (v / V)$ solution of di-bromine solution in ${CCl}_{4}$ (carbon tetrachloride) is $x$ '. $x =$ $_____\times 10^{- 2} M$ . (Nearest integer)

[Given : molar mass of ${Br}_{2} = 160 g {mol}^{- 1}$

atomic mass of $C = 12 g {mol}^{- 1}$

atomic mass of $Cl = 35.5 g {mol}^{- 1}$

density of dibromine $= 3.2 g {cm}^{- 3}$

density of ${CCl}_{4} = 1.6 g {cm}^{- 3}]$

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is :

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

The

{NaNO}_{3}

weighed out to make

50 mL

of an aqueous solution containing

70.0 mg {Na}^{+}

per

mL

is_

g

. (Rounded off to the nearest integer) [Given : Atomic weight in

{gmol}^{- 1} - Na : 23; N : 14; O : 16

]

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

Which of the following is dependent on temperature?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

The density of $3 M$ solution of $NaCl$ is $1.0 g {mL}^{- 1}$ . Molality of the solution is $______\times 10^{- 2} m$ (Nearest integer).

Given: Molar mass of $Na$ and $Cl$ is $23$ and $35.5 g$ ${mol}^{- 1}$ respectively.

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

While combusting in air,

4 g

H_{2}

gas was completely converted into water. If

36 μmole

{CO}_{2}

from air is dissolved into that water, what is the concentration of

{CO}_{2}

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

$1.46 g$ of a biopolymer dissolved in a $100 mL$ water at $300 K$ exerted an osmotic pressure of $2.42 \times 10^{- 3} bar$

The molar mass of the biopolymer is $- \times 10^{4} g$ ${mol}^{- 1} .$ (Round off to the Nearest Integer)
[Use: $R = 0.083 L$ bar ${mol}^{- 1} K^{- 1}]$

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

An aqueous

KCl

solution of density

1.20 g {mL}^{- 1}

has a molality of

3.30 mol {kg}^{- 1}

. The molarity of the solution in

{molL}^{- 1}

is____.(The Nearest integer)

[

Molar mass of

KCl = 74.5 g]

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

The mole fraction of a solvent in aqueous solution of a solute is

0.8 .

The molality (in mol

{k g}^{- 1}

) of the aqueous solution is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

What is the equivalent weight of methanol if one mole of

{CH}_{3} OH

is combusted to form

CO

and

H_{2} O

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

$5.00 mL$ of $0.10 M$ oxalic acid solution taken in a conical flask is titrated against $NaOH$ from a burette using phenolphthalein indicator. The volume of $NaOH$ required for the appearance of permanent faint pink colour is tabulated below for five experiments. The concentration, in molarity, of the $NaOH$ solution is $xM$ .

Exp. No.	Vol. of $NaOH$ $(mL)$
$1$	$12.5$
$2$	$10.5$
$3$	$9.0$
$4$	$9.0$
$5$	$9.0$

What is the value of $100 x$ ?

Round of your answer to the nearest integer.

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

What is mole fraction of the solute in a

1.00

m aqueous solution?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

A gas mixture contains

25 %

He

and

75 % {CH}_{4}

by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately ___ .

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

A solution of sodium sulphate contains

92 g

{Na}^{+}

ions per kilogram of water. The molality of

{Na}^{+}

ions in that solution in

mol {kg}^{- 1}

is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

The number of water molecules in

250 m L

of water is closest to [Given, density of water is

1.0 g m L^{- 1}

; Avogadro's number

= 6.023 \times 10^{23}]

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

A commercially sold conc.

HCl

35 % HCl

by mass. If the density of this commercial acid is

1.46 g / mL

, the molarity of this solution is : (Atomic mass :

Cl = 35.5 amu, H = 1 amu

)

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

Molality

(m)

18 M H_{2} {SO}_{4}

is, approximately [

d = 1.84 g {cm}^{- 3}

, Molar mass of

H_{2} {SO}_{4} = 98 g {mol}^{- 1}

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Volumetric Calculations

What would be the molality of 20% (mass/mass) aqueous solution of

K I

? (molar mass of

K I = 166 g m o l^{- 1}

)

Define the strength of a solution. Write its formula.

Important Questions on Some Basic Concepts of Chemistry

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