EASY

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In acidic medium, dichromatic ion oxidises ferrous ion to 'ferric ion. If the gram molecular weight of potassium dichromate is294g, its gram equivalent weight (in grams) is

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Important Questions on Redox Reactions

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The volume, in

mL

, of

0.02 {MK}_{2} {Cr}_{2} O_{7}

, solution required to react with

0.288 g

of ferrous oxalate in acidic medium is

\dots \dots \dots \dots

(Molar mass of

Fe = 56 {gmol}^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The number of moles of electron required to reduce

0.2

mole of

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

{Cr}^{+ 3}

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The volume (in

mL

) of

0.1 N NaOH

required to neutralise

10 mL of 0.1 N

phosphinic acid is ____________.

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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 Reactions>Equivalent Concept

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

HARD

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

$5.00 mL$ 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 Reactions>Equivalent Concept

A $20.0 mL$ solution containing $0.2 g$ impure $H_{2} O_{2}$ reacts completely with $0.316 g$ of ${KMnO}_{4}$ in acid solution. The purity of $H_{2} O_{2}$ (in $%$ ) is______ (mol. wt. of $H_{2} O_{2} = 34$ ; mol. wt. of ${KMnO}_{4} = 158$ )

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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)

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The amount of

{Na}_{2} S_{2} O_{3} \cdot 5 H_{2} O

required to completely reduce 100 mL of 0.25 N iodine solution, is

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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 Reactions>Equivalent Concept

0.45 g

acid of molecular mass

90

was neutralise by

20

ml

0.5 N KOH

. The basicity of the acid is

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The number of electron required to reduce chromium completely in

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

C r^{3 +}

in acidic medium, is

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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 Reactions>Equivalent Concept

A $100 mL$ solution was made by adding $1.43 g$ of ${Na}_{2} {CO}_{3} . {xH}_{2} O .$ The normality of the solution is $0.1 N$ . The value of $x$ is _______

(The atomic mass of $Na$ is $23 g / mol$ )

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

How much

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

(molecular weight

= 294.19

) is required to prepare one litre of

0.1 N

solution ?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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)

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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 Reactions>Equivalent Concept

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 Reactions>Equivalent Concept

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 Reactions>Equivalent Concept

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

{CO}_{2}

is:

In acidic medium, dichromatic ion oxidises ferrous ion to 'ferric ion. If the gram molecular weight of potassium dichromate is294g, its gram equivalent weight (in grams) is

Important Questions on Redox Reactions

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