Redox Reaction Test

Result

Redox Reaction Test - 11

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Weekly Quiz Competition

Question 1
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Direction (Q. Nos. 1-15) This section contains 15 multiple choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q. As₂S₃ (yellow precipitate) is soluble in cone. HNO₃ as given in unbalanced equation
Equivalent weight in terms of molar mass M of As₂S₃ is

A
M/2

B
M/4

C
M/28

D
M/24

Solution

Increase in oxidation number of As₂S₃, = 28 - 0 = 28
Question 2
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In the following reaction, 2H₂S(g) + SO₂(g) → 3S(S) + 2H₂O (l) One equivalent of H₂S (g)will reduce

A
1 Mole SO₂

B
0.5 Mole SO₂

C
0.25 Mole SO₂

D
2 Mole SO₂

Solution

Change in oxidation number of S of H₂S = 2 units
Change in oxidation number of S of SO₂ = 4 units
Then one mole H₂S = 2 equivalents H₂S
One mole SO₂ = 4 equivalent SO₂
One equivalent H₂3 one equivalent SO₂ = 0.25 mole SO₂
Question 3
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Which has maximum number of equivalents per mole of the oxidant?

A

B

C

D

Solution

Oxidant is the oxidising agent (which has been reduced)
Question 4
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Equivalent weight of H₃PO₂ in a reaction is found to be half of its molecular weight. It can be due to its

A
reaction of two H⁺ ion

B
oxidation of H₃PO₃

C
oxidation of H₃PO₄

D
reduction of PH₃

Solution

(a) It is monobasic acid, hence only oneH+ can be neutralised
Question 5
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KMnO4 (purple) is reduced to K₂M_nO₄ (green) by in basic medium. 1 mole of KMnO₄ is reduced by

A
1 mole of

B
moles of

C
0.5 mole of

D
1.5 mole of

Solution

Multiply by change in oxidation number
Question 6
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Equivalent weight of K₂Cr₂O₇ in the following reaction is

(M = molar mass of K₂Cr₂O₇)

A
M/3

B
M/4

C
M/5

D
M/6

Solution
Question 7
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In the following disproportionation of Cl₂ in basic medium Cl₂ + 2KOH → KCl + KClO + H₂O equivalent mass of Cl₂is

A
35.50

B
11.83

C
47.33

D
71.00

Solution

In a disproportionation reaction net, equivalent mass = E (oxidation part) + E (reduction part)
Question 8
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One mole of CaOCI₂ is dissolved in water and excess of Kl added. Hypo (Na₂S₂O₃) required to react oxidised part completely is

A
1 mole

B
1. 5 mole

C
2 mole

D
2.5 mole

Solution
Question 9
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Consider conversion of MnCI₂ into

Increasing order of equivalent weights of MnCI₂ in these conversions is

A
I < II < III < IV

B
IV < III < II < I

C
IV = III < II = I

D
equivalent weight is independent of oxidation number

Solution
Question 10
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The equivalent weight of MnSO₄ is half of its molecular weight when it converts to

A
Mn₂O₃

B
MnO₂

C

D

Solution
Question 11
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The number of moles of KMnO₄ that will be needed to react with one mole of ferrous sulphite in acidic solution is

A
0.4

B
0.6

C
0.8

D
1.0

Solution
Question 12
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The number of moles of K₂Cr₂O₇ that will be needed to react completely with one mole of ferric sulphite in acidic medium is

A
0.4

B
0.6

C
0.8

D
1.0

Solution
Question 13
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Photosynthesis of carbohydrates in plants takes place as
6CO₂ +12H₂O C₆H₁₂O₆ + 6O₂ + 6H₂O

Equivalent weight of CO₂ and C₆H₁₂O₆ respectively are

A
11,7.5

B
44, 180

C
22, 15

D
44, 90

Solution

Change in oxidation number = 24 units
Question 14
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Equivalent weight of C₆H₅CHO is equal to molar mass in the following reaction.
Thus, species {A) is

A

B

C

D

Solution
Question 15
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Equivalent w eight of KMnO₄ and its reduced species in different mediums are given

A
a

B
b

C
c

D
d

Solution