REDOX REACTIONS 1.
Equation H 2S H 2 O 2
2.
S 2H 2 O represents
(a) Acidic nature of H 2 O 2
(b) Basic nature of H 2 O 2
(c) Oxidising nature of H 2 O 2
(d) Reducing nature of H 2 O 2
In the reaction C 2 O 24
MnO 4
H
Mn 2
CO 2
H 2O
the reductant is (a) C 2 O 24 3.
(c) Mn 2
(b) MnO 4
(d) H
A reducing agent is a substance which can (a) Accept electron (b) Donate electrons (c) Accept protons (d) Donate protons Which of the following is the most powerful oxidizing agent (a) F2 (b) Cl 2 (c) Br2 (d) I 2
4. 5.
Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is (a) HClO 4 (b) HClO 3 (c) HClO 2 (d) HOCl
6.
Identify the correct statement about
7.
(a) It acts as reducing agent only (b) It acts as both oxidising and reducing agent (c) It is neither an oxidiser nor reducer (d) It acts as oxidising agent only Several blocks of magnesium are fixed to the bottom of a ship to (a) Keep away the sharks (b) Make the ship lighter (c) Prevent action of water and salt (d) Prevent puncturing by under-sea rocks Which of the following behaves as both oxidising and reducing agents (a) H 2SO 4 (b) SO 2 (c) H 2S (d) HNO 3
8.
The reaction H 2S H 2 O 2
9.
10. 11.
H 2 O2
2H 2 O S shows
(a) Oxidizing action of H 2 O 2
(b) Reducing action of H 2 O 2
(c) Alkaline nature of H 2 O 2
(d) Acidic nature of H 2 O 2
Which of the following is not a reducing agent (a) NaNO 2 (b) NaNO 3 (c) HI
(d) SnCl 2
Which of the following cannot work as oxidising agent (a) O 2 (b) KMnO 4 (c) I 2
(d) None of these
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12.
H 2 O 2 is used as (b) A reductant only (d) An oxidant, a reductant and an acid
13.
(a) An oxidant only (c) An acid only In C H 2 O CO H 2 , H 2 O acts as
(c) (a) and (b) both
14.
(a) Oxidising agent (b) Reducing agent Strongest reducing agent is
15.
16. 17. 18.
(a) F (b) Cl (c) Br (d) I A solution of sulphur dioxide in water reacts with H 2 S precipitating sulphur. Here sulphur dioxide acts as (a) As oxidising agent (b) A reducing agent (c) An acid (d) A catalyst The oxidation number of sulphur in H 2SO 4 is (a) – 2 (b) + 2 (c) + 4 Oxidation state of chlorine in perchloric acid is (a) – 1 (b) 0 (c) – 7
(d) + 7
(b) + 3.5
(c) – 3, +5
(d) + 5
(c) + 6
(d) + 5
1
The oxidation number of Mn in MnO 4 is (a) + 7
20.
(d) + 6
Oxidation number of N in HNO 3 is (a) – 3.5
19.
(d) None of these
(b) – 5
21.
Sn loses two electrons in a reaction. What will be the oxidation number of tin after the reaction (a) + 2 (b) Zero (c) + 4 (d) – 2 The oxidation state of Mn in K 2 MnO 4
22.
(a) + 2 (b) + 7 (c) – 2 Oxidation number of oxygen in O 2 molecule is
23. 24. 25. 26.
(d) + 6
(a) + 1 (b) 0 (c) + 2 (d) – 2 Maximum oxidation state of Cr is (a) 3 (b) 4(c) 6 (d) 7 In which of the following compound transition metal has zero oxidation state (a) CrO5 (b) NH 2 .NH 2 (c) NOClO 4 (d) [Fe(CO ) 5 ] Carbon is in the lowest oxidation state in (a) CH 4 (b) CCl 4
(c) CF4
(d) CO 2
(c) + 2
(d) – 2
Oxidation number of carbon in H 2 C 2 O 4 is (a) + 4
(b) + 3
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27.
The oxidation number of Pt in [Pt(C 2 H 4 ) Cl 3 ] is (a) + 1
28. 29. 30.
(b) + 2
(c) + 3
(d) + 4
The oxidation number of carbon in CH 2 Cl 2 is (a) 0 (b) + 2 (c) 2 (d) + 4 The oxidation states of phosphorus vary from (a) – 3 to +5 (b) – 1 to +1 (c) – 3 to +3 (d) – 5 to +1 The process in which oxidation number increases is known as (a) Oxidation (b) Reduction (c) Auto-oxidation (d) None of the above
EQUILIBRIUM 1
c
2
a
3
b
4
a
5
d
6
b
7
c
8
b
9
a
10
b
11
c
12
d
13
a
14
d
15
a
16
d
17
d
18
d
19
a
20
c
21
d
22
b
23
c
24
d
25
a
26
b
27
b
28
a
29
a
30
a
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