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Which of the following can not be a primary standard solution?

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Important Questions on Redox Reactions

EASY

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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}]

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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 ___ .

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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}

HARD

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

To measure the quantity of

{MnCl}_{2}

dissolved in an aqueous solution, it was completely converted to

{KMnO}_{4}

using the reaction,

{MnCl}_{2} + K_{2} S_{2} O_{8} + H_{2} O \to {KMnO}_{4} + H_{2} {SO}_{4} + HCl

(equation not balanced). Few drops of concentrated

HCl

were added to this solution and gently warmed. Further, oxalic acid

(225 mg)

) was added in portions till the colour of the permanganate ion disappeared. What is the quantity of

{MnCl}_{2}

(in mg) present in the initial solution? (Atomic weights in

g {mol}^{- 1} : Mn = 55, Cl = 35 .5

)

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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 :

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Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

50 mL

0 .5 M

oxalic acid is needed to neutralize

25 mL

of sodium hydroxide solution. What is the amount of

NaOH

50 mL

of the given sodium hydroxide solution?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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}

EASY

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

While titration dilute

HCl

solution with aqueous

NaOH

, which of the following will not be required ?

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Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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>Redox Reactions>Principles of Volumetric Analysis

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}

)

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

For standardizing

NaOH

solution, which of the following is used as a primary standard?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

What is mole fraction of the solute in a

1.00

m aqueous solution?

HARD

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

In a complexometric titration of metal ion with ligand

M (M e t a l i o n) + L (L i g a n d) \to C (C o m p l e x)

end point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs then the titration plot between absorbed light

(A)

versus volume of ligand 'L'

(V)

would look like:

EASY

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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:

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

An alkali is titrated against acid with methyl orange as an indicator, which of the following is a correct combination?

HARD

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

0.4 g

mixture of

NaOH, {Na}_{2} {CO}_{3}

and some inert impurities was first titrated with

\frac{N}{10} HCl

using phenolphthalein as an indicator,

17.5 mL

HCl

was required at the end point. After this methyl orange was added and titrated.

1.5 mL

of same

HCl

was required for the next end point. The weight percentage of

{Na}_{2} {CO}_{3}

in the mixture is (Rounded-off to the nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

2 {KMnO}_{4} + 3 H_{2} {SO}_{4} + 5 H_{2} O_{2} \to K_{2} {SO}_{4} + 2 {MnSO}_{4} + 8 H_{2} O + 5 O_{2}

Find the nonnality of

H_{2} O_{2}

solution, if

20 mL

of it is required to react completely with

16 mL

0.02 {MKMnO}_{4}

solution. ( Molar mass of

{KMnO}_{4} = 158 g {mol}^{- 1}

)

HARD

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

$5.00 mL$ 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>Redox Reactions>Principles of Volumetric Analysis

Which of the following is dependent on temperature?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Principles of Volumetric Analysis

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:

Which of the following can not be a primary standard solution?

Important Questions on Redox Reactions

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