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Redox Reactions

KMnO4 and K...

Question

$K M n O_{4}$ and $K_{2} C r_{2} O_{7}$ are _____agents and $N a_{2} S_{2} O_{7}$ is ______ agent.

A

reducing , oxydising

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B

oxydising , reducing

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C

reducing , reducing

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D

oxydising , oxydising

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Solution

The correct option is B oxydising , reducing
An oxidizing agent (oxidant, oxidizer) is a substance that has the ability to oxidize other substances (cause them to lose electrons).
${K M n O}_{4}, K_{2} {C r}_{2} O_{7}$ are oxidizing agent.
A reducing agent (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction. Since the reducing agent is losing electrons, it is said to have been oxidized.
${N a}_{2} S_{2} O_{3}$ is a reducing agent.

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Similar questions

Q. Which is better oxidising agent out of KMnO₄ and K₂Cr₂O₇ ?

Q. Three different solutions of oxidising agents, i.e.

K_{2} C r_{2} O_{7}, I_{2}

K M n O_{4}

is titrated separately with

0.19

K_{2} S_{2} O_{3}

. The molarity of each oxidising agent is

0.1 M

and the reactions are as follows:
i.

C r_{2} O_{7}^{2 -} + S_{2} O_{3}^{2 -} \to C r^{3 +} + S O_{4}^{2 -}

I_{2} + S_{2} O_{3}^{2 -} \to I^{⊝} + S_{4} O_{6}^{2 -}

M n O_{4}^{⊝} + S_{2} O_{3}^{2 -} \to M n O_{2} + S O_{4}^{2 -}

(Molecular weight of

K_{2} S_{2} O_{3} = 190, K_{2} C r_{2} O_{7} = 294, K M n O_{4} = 158,

I_{2} = 254 g

m o l^{- 1}

Which of the following statements is/are correct?

Q. If two sample of 2 mole ferrous oxalate is treated separately with
(i) Acidic KMnO4 and moles of KMnO4 used are x
(ii) Acidic K2Cr2O7 and moles of K2Cr2O7 used are y

0.5

K_{2} C r_{2} O_{7}

K M n O_{4}

is treated with excess of

K I

in acidic medium.

I_{2}

liberated requires

100

0.15 N

N a_{2} S_{2} O_{3}

solution for titration.

%

K_{2} C r_{2} O_{7}

%

K M n O_{4}

Q. An equal volume of a reducing agent is titrated separately with

1 M

K M n O_{4}

in acidic, neutral and alkaline medium. The volumes of

K M n O_{4}

20

33.3

mL in neutral and

100

mL in alkaline medium. Find out the volume of

1

K_{2} C r_{2} O_{7}

consumed if the same volume of the reducing agent is titrated in acidic medium.

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