Redox Reaction Test

Result

Redox Reaction Test - 7

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Weekly Quiz Competition

Question 1
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Direction (Q. Nos. 1-12) This section contains 12 multiple-choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Consider the following reactions.
I. Zn + dil. H₂So₄ → ZnSO₄ + H₂
II. Zn + conc. H2SO4 → ZnSO₄ + SO₄ + H₂O
III. Zn + HNO₃ → Zn(NO₃)₂ + H₂O + NH₄NO₃
Q. Oxidation number of H changes in:

A
I, II and III

B
I and II

C
II and III

D
Only I

Solution
Question 2
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In which case change of oxidation number of V is maximum?

A

B

C

D
Equal in each case

Solution
Question 3
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In which of the following set of compounds oxidation number of oxygen is not (- 2)?

A
KO₂, OF₂, H₂O₂

B

C
CO₂, CrO₃, P₂O₃

D
HNO₂, HNO₃, N₂O

Solution

OF₂ Fluorine is most electronegative atom with oxidation number = - 1
x - 2 = 0
x = + 2
H₂O₂ 2 + 2x = 0 ⇒ x = - 1
Question 4
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Which is chlorate (I) ion?

A
ClO₂^-

B
ClO₃^-

C
ClO₄^-

D
ClO^-
Solution
ClO₃^-: A very reactive inorganic anion.
The term chlorate can also be used to describe any compound containing the chlorate ion, normally chlorate salts.
Example: Potassium chlorate, KClO₃
Question 5
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Which of the following is not an example of redox reaction?

A
BaCl₂ + H₂SO₄ ⎯→ BaSO₄ + 2HCl

B
Fe₂O₃ + 3CO ⎯→ 2Fe + 3CO₂

C
2K + F₂ ⎯→ 2KF

D
CuO + H₂ ⎯→ Cu + H₂O

Solution

a) BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl is not a redox reaction, as there is no change in the oxidation state of any element.
It is an example of double displacement reactions.
Question 6
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Which of the following atom has been assigned only single oxidation number?

A
H

B
O

C
N

D
F
Solution
Fluorine is the most electronegative element. It can gain one electron.
Thus, Oxidation number = -1
F+ e- → F^-
Due to very high (IE), it cannot lose electrons.
(a) H^- (-1), (H⁺ (+1)
(b) O^-2 in oxide, -1 in peroxide, and +2 in OF₂
(c) +3 in N₂O₃, -3 in NH₃, +3 in HNO₂, +5 in HNO₃, + 1 in N₂O
Question 7
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The oxidation number of P in Ba(H₂PO₂)₂, Ba(H₂PO₃)₂ and Ba(H₂PO₄)₂ are respectively

A
+ 1, + 2, + 3

B
+ 3, + 2, + 1

C
+ 1, + 3, + 5

D
+ 2 in all

Solution
Question 8
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the oxidation number of sulphur in S₈,S₂F₂,H₂S respectively are

A
0,+1 and -2

B
+2, +1 and -2

C
0, +1 and +2

D
-2, +1 and -2

Solution

(i) Oxidation state of element in its free state is zero.
(ii) Sum of oxidation states of all atoms in compound is zero.
O.N of S in S₈=0; O.N of S in S₂F₂=+1
O.N of S in H₂S=-2
Question 9
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In which of the following reactions oxidation number of chromium has been affected?

A

B

C

D

Solution

Oxidation number of Cr changes from +6 to +3.
Question 10
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Prussian blue is represented by KFe^x[Fe(CN)₆]. Value of x is

A
zero

B
+ 2

C
+ 3

D
- 1

Solution
Question 11
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In the following reaction, , oxidation number of

A
N changes from -2 to +2

B
N changes from -2 to 0

C
N in changes from -3 to 0 and that in changes from +3 to 0

D
N does not change
Question 12
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Select the set of compounds having fractional oxidation number in one or more atoms.

A
FeO, Fe₂O₃, Fe₃O₄, C₃O₂

B

C

D

Solution