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Earn 100

An aqueous solution of ${FeCl}_{3}$ obtained, when an etched copper circuit board was washed, required $40 mL$ of $0.1 M$ hydrazine hydrochloride for its reduction to ${Fe}^{2 +}$ . During this process hydrazine gets converted to $N_{2}$ . How many $mL$ of $\frac{2}{3} M$ nitric acid is required for the re-oxidation of ${Fe}^{2 +}$ to ${Fe}^{3 +}$ ?

[Given: Nitric acid gets reduced to $NO$ during this process]

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Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

100 g

of propane is completely reacted with

1000 g

of oxygen. The mole fraction of carbon dioxide in the resulting mixture is

x \times 10^{- 2}

. The value of

x

is (Nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

If a

6.5 M

solution of

KOH

in water contains

30 %

by mass of

KOH .

then find the density of given solution. (Atomic masses:

K \to 39, 0 \to 16, H \to 1

)

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Calculate the mole fraction of

{CH}_{3} OH

5

molal aqueous solution of

{CH}_{3} OH .

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

100 mL

brandy contains

40 mL

ethanol, The mole fraction of water is

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Calculate the mass percentage of

3 g

of solute

A

dissolved in

18 g

of water.

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The volume of

' 10 vol'

H_{2} O_{2}

required to liberate

500 mL O_{2}

NTP

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

At STP if a mixture of Methane

({CH}_{4})

and Argon

(Ar)

has a density of

1.5 g \cdot L^{- 1},

then the mole fraction of methane in the mixture is [Given atomic mass of

Ar = 40

]

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

A solution is obtained by mixing 300g of 25% solution and 400g of 40% solution by mass. Calculate the mass percentage (w/w) of water in solution.

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

A mixture has

18 g

of water and

414 g

of ethanol. The mole fraction of water in the mixture is (assume ideal behaviour of the mixture)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Density of

3 M

solution of

NaCl

1.25 g / mL .

The mass of the solvent in the solution is;

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Define the following term :

Mole fraction

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Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

100 m L

of a water sample contains

0.81 g

of calcium bicarbonate and

0.73

g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of

C a C O_{3}

is:
(molar mass of calcium bicarbonate is

162 g m m o l^{- 1}

and magnesium bicarbonate is

146 g m o l^{- 1})

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Name two concentration terms which have no effect on temperature change.

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Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

If the density of a

2 M

solution of ethylene glycol in water is

1.11 g / ml,

the molality (in

m

) of the solution is approximately

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Calculate the mole fraction of ethylene glycol

(C_{2} H_{6} O_{2})

if 20% by mass of

(C_{2} H_{6} O_{2})

is present in that solution.

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Explain mole fraction.

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

What is the concentration of solution in ppm when $5.0 \times 10^{- 5} g {CO}_{2}$ is dissolved in $100 mL$ solution.

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The mole fraction of a solute in a $100$ molal aqueous solution ________ $\times 10^{- 2} .$

(Round off to the Nearest Integer).

[Given : Atomic masses: $H : 1.0 u, O : 16.0 u$ ]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

5.2

molal aqueous solution of methyl alcohol,

{CH}_{3} OH

, is supplied. What is the mole fraction of methyl alcohol in the solution?

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Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The mass percentage of nitrogen in histamine is ________

Important Questions on Solutions

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