HARD

Earn 100

150 mL of H₂O₂ sample was divided into two parts. First part was treated with KI and formed KOH required 200 mL of M/2 H₂SO₄ for neutralisation. Other part was treated with KMnO₄ yielding 6.74 litre of O₂ at 1 atm and 273 K. Using % yield indicated, the volume strength of H₂O₂ sample used is: $\begin{matrix} H_{2} O_{2} + 2KI & \overset{40% yield}{\to} & I_{2} + 2 KOH \\ H_{2} O_{2} + 2 {KMnO}_{4} + 3 H_{2} {SO}_{4} & \overset{50% yield}{\to} & K_{2} {SO}_{4} + 2 {MnSO}_{4} + 3 O_{2} + 4 H_{2} O \end{matrix}$

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Important Questions on Redox Reactions

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 moles of electron required to reduce

0.2

mole of

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

{Cr}^{+ 3}

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

$50 mL$ of $0.2 N HCl$ is titrated against $0.1 N NaOH$ solution. The titration is discontinued after adding $50 mL$ of $NaOH$ solution. The remaining titration is completed by adding $0.5 N KOH$ solution. What is the volume of $KOH$ solution required for completing the titration ?

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 :

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 ?

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The strengths of

5.6

volume hydrogen peroxide (of density

1 g / mL

) in terms of mass percentage and molarity

(M)

respectively, are: (Take molar mass of hydrogen peroxide as

34 g / mol

)

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 ____________.

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The strength of $11.2$ volume solution of $H_{2} O_{2}$ is

[Given that, the molar mass of $H = 1 g m o l^{- 1}$ and $O = 16 g m o l^{- 1}$ ]

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

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})

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

Calculate normality of the solution obtained by mixing

100 ml

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

and

200 ml

0.1 M HCl

solutions.

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

What is the hardness of a water sample

(

in terms of equivalents of

{CaCO}_{3})

containing

10^{- 3} M {CaSO}_{4}

(

Molar mass of

{CaSO}_{4} = 136 g {mol}^{- 1})

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

A fuel cell generates electricity by using methanol as fuel and

O_{2}

as the oxidant. Calculate the equivalent weight of methanol.

EASY

Chemistry>Physical Chemistry>Redox Reactions>Equivalent Concept

The volume strength of

8.9 M H_{2} O_{2}

solution calculated at

273 K

and 1 atm is

........ (R = 0 .0821 L atm K^{- 1} {mol}^{- 1})

(rounded off to the nearest integer)

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 $23 g / mol$ )

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

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

The volume strength of

1 M H_{2} O_{2}

is:

(Molar mass of

H_{2} O_{2} = 34 g mol^{- 1}

)

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:

Important Questions on Redox Reactions

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