Consider the reaction : H 2 SO 3 aq + Sn aq 4 + + H 2 O l ⁡ → Sn aq 2 + + HSO 4 aq - + 3 H aq + Which of the following statements is correct ?

H 2 SO 3 is the reducing agent because it undergoes oxidation

Sn 4 + is the oxidizing agent because it undergoes oxidation

Sn 4 + is the reducing agent because it undergoes oxidation

H 2 SO 3 is the reducing agent because it undergoes reduction

HARD

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The Plot of $pH$ -metric titration of weak base ${NH}_{4} OH$ vs strong acid $HCl$ looks like

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Important Questions on Redox Reactions and Electrochemistry

HARD

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

A compound '

X

' is a weak acid and it exhibits colour change at

pH

close to the equivalence point during neutralization of

NaOH

with

{CH}_{3} COOH

. Compound '

X

' exists in ionized form in basic medium. The compound '

X

' is

EASY

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

In the following passage there are blanks, each of which has been numbered. There are questions given below the passage and for each question, four words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

Whenever I go into a bank, I feel scared. Everybody and everything that I see there (1) ____ me. As for the manager the sight (2) ____ him simply terrifies me and (3) ____ me want to runaway (4) _____ I can. As soon as I (5) ____ the door of the bank I lose my head (6) ____ when I try to do any (7) ____ there, I behave like an idiot. I cannot explain (8) ____ for this but that is how it (9) ____ has been that is how it is (10) ____.

Select the most appropriate option for blank No. 10.

HARD

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

In base vs. Acid titration, at the end point methyl orange is present as

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

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?

HARD

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

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 Reactions and Electrochemistry>Oxidation and Reduction

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : An aqueous solution of $KOH$ when for volumetric analysis, its concentration should be checked before the use.

Reason (R) : On aging, $KOH$ solution absorbs atmospheric ${CO}_{2}$ .

In the light of the above statements, choose the correct answer from the options given below.

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

By the reaction of aqueous

{NaHCO}_{3}

, with which of the following compounds

{CO}_{2}

, is produced?

EASY

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

Consider the reaction :

H_{2} {SO}_{3 (aq)} + {Sn}_{(aq)}^{4 +} + H_{2} O_{(l)} \to {Sn}_{(aq)}^{2 +} + {HSO}_{4 (aq)}^{-} + 3 H_{(aq)}^{+}

Which of the following statements is correct ?

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

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 Reactions and Electrochemistry>Oxidation and Reduction

Given below are two statements:
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with $\mathrm{NaOH}$ phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:

EASY

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

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

EASY

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

Which among the following compounds does not act as a reducing agent?

HARD

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

$20 mL$ of $0.02 M$ hypo solution is used for the titration of $10 mL$ of copper sulphate solution, in the presence of excess of $KI$ using starch as an indicator. The molarity of ${Cu}^{2 +}$ is found to be $_____\times 10^{- 2} M$ (nearest integer)

Given : $2 {Cu}^{2 +} + 4 I^{-} \to {Cu}_{2} I_{2} + I_{2} I_{2} + 2 S_{2} O_{3}^{- 2} \to 2 I^{—} + S_{4} O_{6}^{- 2}$

EASY

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

In which of the following reactions

H_{2} O_{2}

acts as a reducing agent ?

(a) H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O

(b) H_{2} O_{2} - 2 e^{-} \to O_{2} + 2 H^{+}

(c) H_{2} O_{2} + 2 e^{-} \to 2 {OH}^{-}

(d) H_{2} O_{2} + 2 {OH}^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

For a linear plot of

\log (\frac{x}{m})

versus

\log p

in a Freundlich adsorption isotherm, which of the following statements is correct? (

k

and

n

are constants)

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

How many electrons are involved in the following redox reaction ?

{Cr}_{2} O_{7}^{2 -} + {Fe}^{2 +} + C_{2} O_{4}^{2 -} \to {Cr}^{3 +} + {Fe}^{3 +} + {CO}_{2}

(Unbalanced)

HARD

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

Number of moles of dichromate needed to oxidise one mole of

{Sn}^{2 +}

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions and Electrochemistry>Oxidation and Reduction

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 and Electrochemistry>Oxidation and Reduction

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:

The Plot of pH-metric titration of weak base NH4OH vs strong acid HCl looks like

Important Questions on Redox Reactions and Electrochemistry

Learn and Prepare for any exam you want !

The Plot of $pH$ -metric titration of weak base ${NH}_{4} OH$ vs strong acid $HCl$ looks like