EASY

Earn 100

Find the valency factor of sodium sulphate.

Important Questions on Redox Reaction

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>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?

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

0.45 g

acid of molecular mass

90

was neutralise by

20

ml

0.5 N KOH

. The basicity of the acid is

EASY

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

When

10 mL

of an aqueous solution of

{Fe}^{2 +}

ions was titrated in the presence of dil

H_{2} {SO}_{4}

using diphenylamine indicator,

15 mL

0.02 M

solution of

K_{2} {Cr}_{2} O_{7}

was required to get the end point. The molarity of the solution containing

{Fe}^{2 +}

ions is

x \times 10^{- 2} M

. The value of

x

is ______. (Nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

The strength of an aqueous

N a O H

solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

1 mol

F e S O_{4}

(a t o m i c w e i g h t o f F e i s 55.84 g m o l^{- 1})

is oxidized to

F e_{2} {(S O_{4})}_{3}

. Calculate the equivalent weight of ferrous ion

EASY

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

The volume of 0.1 M strong dibasic acid sufficient to neutralize 1g of a base that furnishes 0.04 mole of

O H^{-}

in aqueous solution is :

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

A fuel cell generates electricity by using methanol as fuel and

O_{2}

as the oxidant. Calculate the equivalent weight of methanol.

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

In basic medium

{CrO}_{4}^{2 -}

oxidises

S_{2} O_{3}^{2 -}

to form

{SO}_{4}^{2 -}

and itself changes into

Cr {(OH)}_{4}^{-}

.The volume of

0.154 {MCrO}_{4}^{2 -}

required to react with

40 mL

0.25 {MS}_{2} {O_{3}}^{2 -}

is _____

mL .

(Rounded-off to the nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

In order to oxidize a mixture of one mole of each of

F e C_{2} O_{4}, F e_{2} {(C_{2} O_{4})}_{3}, F e S O_{4}

and

F e_{2} {(S O_{4})}_{3}

in acidic medium, the number of moles of

K M n O_{4}

is:

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

The number of moles of electron required to reduce

0.2

mole of

{Cr}_{2} O_{7}^{- 2}

{Cr}^{+ 3}

HARD

Chemistry>Physical Chemistry>Redox Reaction>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.

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

The number of electron required to reduce chromium completely in

{Cr}_{2} O_{7}^{2 -}

C r^{3 +}

in acidic medium, is

EASY

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

How much

K_{2} {Cr}_{2} O_{7}

(molecular weight

= 294.19

) is required to prepare one litre of

0.1 N

solution ?

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>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 Reaction>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)

EASY

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

15 mL

of aqueous solution of

{Fe}^{2 +}

in acidic medium completely reacted with

20 mL

0.03 M

aqueous

{Cr}_{2} {O_{7}}^{2 -} .

The molarity of the

{Fe}^{2 +}

solution is _______

\times 10^{- 2} M

(Round off to the Nearest Integer).

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula

{[Ag {({NH}_{3})}_{2}]}^{+}

per aldehyde group to form silver mirror is ___.(Round off to the Nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

4 g

of copper was dissolved in

conc . {HNO}_{3}

. The copper nitrate thus obtained gave

5 g

of its oxide on strong heating the equivalent weight of copper is

MEDIUM

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

Complete reaction of 2.0 g of calcium (at wt. = 40) with excess

H C l

produces

1.125 L o f H_{2}

gas. Complete reaction of the same quantity of another metal "M" with excess

H C l

produces

1.85 L o f H_{2}

gas under identical conditions. The equivalent weight of "M" is closest to:

HARD

Chemistry>Physical Chemistry>Redox Reaction>Volumetric Analysis

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of

{CO}_{2}

is:

Find the valency factor of sodium sulphate.

Important Questions on Redox Reaction

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