Which one of the following is the correct sequence of the given elements in the increasing order of their reactivity?

Bromine- Iodine- Chlorine-Fluorine

Iodine -Bromine- Chlorine-Fluorine

Bromine- Iodine- Chlorine-Fluorine

Bromine- Iodine- Fluorine-Chlorine

Iodine -Bromine- Fluorine-Chlorine

The conversion of sugar C12H22O11 CO2 is

Oxidation state of phosphorus varies from

The conversion of sugar C

Oxidation state of phosphorus varies from

68 + Mcqs in Oxidation and Reduction in Chemistry Page 1 McqOptions

1.	Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation?
A.	Law of conservation of mass
B.	Law of definite proportion
C.	Law of multiple proportion
D.	Avogadro's law
Answer» C. Law of multiple proportion

Discussion

2.	Which one of the following is the correct sequence of the given elements in the increasing order of their reactivity?
A.	Iodine -Bromine- Chlorine-Fluorine
B.	Bromine- Iodine- Chlorine-Fluorine
C.	Bromine- Iodine- Fluorine-Chlorine
D.	Iodine -Bromine- Fluorine-Chlorine
Answer» B. Bromine- Iodine- Chlorine-Fluorine

Discussion

3.	The important metal used with iron to produce stainless steel is
A.	carbon
B.	tin
C.	charomium
D.	aluminium
Answer» D. aluminium

Discussion

4.	When iron is rusted, it is
A.	Oxidised
B.	Reduced
C.	Evaporated
D.	Decomposed
Answer» B. Reduced

Discussion

5.	In which one of the following situations a chemical reaction does not occur?
A.	Common salt is exposed to air
B.	Coal is burnt in air
C.	Sodium is placed in water
D.	Iron is kept in moist air
Answer» B. Coal is burnt in air

Discussion

6.	Which among the following elements (metals) pollutes the airof a city having large number of automobiles?
A.	Cadmium
B.	Lead
C.	Chromium
D.	Nickel
Answer» C. Chromium

Discussion

7.	The oxidation state of Cr in [Cr(NH₃)₄CI₂]⁺ is
A.	+3
B.	+2
C.	+1
D.	0
Answer» B. +2

Discussion

8.	The oxidation state of C in C₂H₁₂O₆ is
A.	+1
B.	+2
C.	0
D.	None
Answer» D. None

Discussion

9.

Match List-I (Oxidation number) with List-II (The element) ad select the correct answer using the code given below the list :
List-I (Oxidation number) List-II(The element)
F. 2 1. Oxidation number of Mn in MnO₂
G. 3 2. Oxidation number of S in H₂S₂O₇
H. 4 3. Oxidation number of Ca in CaO
J. 6 4. Oxidation number of Al in NaAIH₄
Codes :
F G H J
A. 3 4 1 2
B. 4 3 1 2
C. 3 4 2 1
D. 4 3 2 1

A.

B.

C.

D.

Answer» B. B.

Discussion

10.	Oxidation state of Mn in acidic KMnO₄ change from is :
A.	+7 to +3
B.	+7 to +2
C.	+7 to +6
D.	+1
Answer» C. +7 to +6

Discussion

11.	In (Ni [CO₄)] the oxidation state of Ni is
A.	4
B.	Zero
C.	2
D.	8
Answer» C. 2

Discussion

12.	The oxidation state of oxygen of OF₂ is
A.	+2
B.	-2
C.	+1
D.	-1
Answer» B. -2

Discussion

13.	Oxidation state of C in oxalic acid (H₂C₂O₄) is
A.	+4
B.	+2
C.	+3
D.	+1
Answer» D. +1

Discussion

14.	The conversion of sugar C₁₂H₂₂O₁₁ CO₂ is
A.	Oxidation state of phosphorus varies from
B.	-1 to +1
C.	-3 to +3
D.	-3 to 5
E.	-5 to +1
Answer» D. -3 to 5

Discussion

15.	Oxidation number of fluorine in F₂O is
A.	+1
B.	+2
C.	-1
D.	-2
Answer» D. -2

Discussion

16.	Select the compound in which chlorine shows oxidation state + 7 ?
A.	HCIO
B.	HCIO
C.	HCIO
D.	HCIO
Answer» B. HCIO

Discussion

17.	The oxidation state of nitrogen in N₃H is
A.	+ 1/2
B.	+3
C.	-1
D.	-1/2
Answer» E.

Discussion

18.	Consider the following statements 1. Phosphorous exhibits oxidation states of 3 and 5 2. Iron exhibits oxidation state + 2 and + 3 Which of the statement given above is/are correct ?
A.	1 only
B.	2 only
C.	Both 1 and 2
D.	Neither 1 nor 2
Answer» D. Neither 1 nor 2

Discussion

19.	Example of covalent bond is
A.	KCI
B.	BaO
C.	CHCI
D.	CaH
Answer» D. CaH

Discussion

20.	The brown ring complex compound is formulated as [Fe(H₂O)₅(NO)SO₄ the oxidation state of iron is
A.	1
B.	2
C.	3
D.	Zero
Answer» C. 3

Discussion

21.	The conversion of Fe⁺⁺ to Fe⁺⁺⁺ is
A.	oxidation
B.	reduction
C.	ionisation
D.	nuclear reaction
Answer» B. reduction

Discussion

22.	Oxidation number of 'S' in Na₂S₄O₆ is
A.	+ 0.5
B.	2.5
C.	+4
D.	+6
Answer» C. +4

Discussion

23.	The oxidation state of Cr in K₂Cr₇ is
A.	+7
B.	+6
C.	+3
D.	+2
Answer» C. +3

Discussion

24.	The oxidation number of Fe in K₄[Fe(CN₆)] is
A.	+6
B.	+4
C.	+3
D.	+2
Answer» E.

Discussion

25.	The oxidation number and covalency of sulphur in S₈ is
A.	+2, 0
B.	0, 2
C.	0, 8
D.	6, 2
Answer» C. 0, 8

Discussion

26.	The value of n in the following equation is Cr₂O^2-₇ + 14H⁺ + ne 2 Cr³⁺ + 7H₂O⁺
A.	6
B.	2
C.	3
D.	4
Answer» B. 2

Discussion

27.	The oxidation number of iron in Fe₃O₄ is
A.	+2
B.	+3
C.	8/3
D.	2/3
Answer» D. 2/3

Discussion

28.	The oxidation number of nitrogen is NO^-₃ is
A.	-1
B.	+2
C.	+3
D.	+5
Answer» E.

Discussion

29.	Oxidation number of N in NH₄NO₃ is
A.	-3
B.	+5
C.	-3 and +5
D.	+3 and -5
Answer» D. +3 and -5

Discussion

30.	The redox reaction, Na₂S₂O₃ changes to Na₂S₄O₆ What is the equivalent-weight of Na₂S₃O₃ ?
A.	Same as its molecular weight
B.	1/2 x its molecular weight
C.	1/3 x its molecular weight
D.	1/4 x its molecular weight
Answer» B. 1/2 x its molecular weight

Discussion

31.	What is the oxidation number of sulphur in SO^2-₄ ion
A.	-2
B.	+2
C.	+6
D.	8
Answer» D. 8

Discussion

32.	Oxidation state of Mn in acidic KMnO
A.	+7 to +3
B.	+7 to +2
C.	+7 to +6
D.	+1
Answer» C. +7 to +6

Discussion

33.	Molten NaCI is good conductor of electricity is due to
A.	free electron
B.	free ions
C.	free molecules
D.	none
Answer» C. free molecules

Discussion

34.	During electrolysis the reaction at anode is
A.	Oxidation
B.	Reduction
C.	Decomposition
D.	None of these
Answer» B. Reduction

Discussion

35.	The brown ring complex compound is formulated as [Fe(H
A.	1
B.	2
C.	3
D.	Zero
Answer» C. 3

Discussion

36.	The oxidation number of cholrine in HCI is
A.	-1
B.	Zero
C.	+1
D.	+2
Answer» D. +2

Discussion

37.	Of the following elements, which one has the same oxidation state in all of its compounds ?
A.	Hydrogen
B.	Fluorine
C.	Carbon
D.	Oxygen
Answer» C. Carbon

Discussion

38.	The oxidation state of oxygen of OF
A.	+2
B.	-2
C.	+1
D.	-1
Answer» B. -2

Discussion

39.	Oxidation state of C in oxalic acid (H
A.	+4
B.	+2
C.	+3
D.	+1
Answer» D. +1

Discussion

40.	The oxidation state of Cr in [Cr(NH
A.	+3
B.	+2
C.	+1
D.	0
Answer» B. +2

Discussion

41.	The common oxidation state of alkali metals in the combined state is
A.	+1
B.	+2
C.	-1
D.	-2
Answer» B. +2

Discussion

42.	In an electrolytic cell, the electrode at which the electron enters the solution is known as cathode while the change takes place at this electrode is known as
A.	reduction
B.	oxidation
C.	ionisation
D.	None of these
Answer» B. oxidation

Discussion

43.	The oxidation number and covalency of sulphur in S
A.	+2, 0
B.	0, 2
C.	0, 8
D.	6, 2
Answer» C. 0, 8

Discussion

44.	In (Ni [CO
A.	4
B.	Zero
C.	2
D.	8
Answer» C. 2

Discussion

45.	Oxidation number of fluorine in F
A.	+1
B.	+2
C.	-1
D.	-2
Answer» D. -2

Discussion

46.	The oxidation of two Cl atoms in bleaching powder Ca(OCI) CI is
A.	-1, -1
B.	+1, -1
C.	+1, +1
D.	0, -1
Answer» C. +1, +1

Discussion

47.	The conversion of sugar C
A.	Oxidation state of phosphorus varies from
B.	-1 to +1
C.	-3 to +3
D.	-3 to 5
E.	-5 to +1
Answer» D. -3 to 5

Discussion

48.	The oxidation state of C in C
A.	+1
B.	+2
C.	0
D.	None
Answer» D. None

Discussion

49.	Match List-I (Oxidation number) with List-II (The element) ad select the correct answer using the code given below the list :
A.	A.
B.	B.
C.	C.
D.	D.
Answer» B. B.

Discussion

50.	The oxidation state of nitrogen in N
A.	+ 1/2
B.	+3
C.	-1
D.	-1/2
Answer» E.

Discussion

Explore topic-wise MCQs in Chemistry.

Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation?

Which one of the following is the correct sequence of the given elements in the increasing order of their reactivity?

The important metal used with iron to produce stainless steel is

When iron is rusted, it is

In which one of the following situations a chemical reaction does not occur?

Which among the following elements (metals) pollutes the airof a city having large number of automobiles?

The oxidation state of Cr in [Cr(NH3)4CI2]+ is

The oxidation state of C in C2H12O6 is

Oxidation state of Mn in acidic KMnO4 change from is :

In (Ni [CO4)] the oxidation state of Ni is

The oxidation state of oxygen of OF2 is

Oxidation state of C in oxalic acid (H2C2O4) is

The conversion of sugar C12H22O11 CO2 is

Oxidation number of fluorine in F2O is

Select the compound in which chlorine shows oxidation state + 7 ?

The oxidation state of nitrogen in N3H is

Consider the following statements1. Phosphorous exhibits oxidation states of 3 and 52. Iron exhibits oxidation state + 2 and + 3Which of the statement given above is/are correct ?

Example of covalent bond is

The brown ring complex compound is formulated as [Fe(H2O)5(NO)SO4 the oxidation state of iron is

The conversion of Fe++ to Fe+++ is

Oxidation number of 'S' in Na2S4O6 is

The oxidation state of Cr in K2Cr7 is

The oxidation number of Fe in K4[Fe(CN6)] is

The oxidation number and covalency of sulphur in S8 is

The value of n in the following equation is Cr2O2-7 + 14H+ + ne 2 Cr3+ + 7H2O+

The oxidation number of iron in Fe3O4 is

The oxidation number of nitrogen is NO-3 is

Oxidation number of N in NH4NO3 is

The redox reaction, Na2S2O3 changes to Na2S4O6 What is the equivalent-weight of Na2S3O3 ?

What is the oxidation number of sulphur in SO2-4 ion

Oxidation state of Mn in acidic KMnO

Molten NaCI is good conductor of electricity is due to

During electrolysis the reaction at anode is

The brown ring complex compound is formulated as [Fe(H

The oxidation number of cholrine in HCI is

Of the following elements, which one has the same oxidation state in all of its compounds ?

The oxidation state of oxygen of OF

Oxidation state of C in oxalic acid (H

The oxidation state of Cr in [Cr(NH

The common oxidation state of alkali metals in the combined state is

In an electrolytic cell, the electrode at which the electron enters the solution is known as cathode while the change takes place at this electrode is known as

The oxidation number and covalency of sulphur in S

In (Ni [CO

Oxidation number of fluorine in F

The oxidation of two Cl atoms in bleaching powder Ca(OCI) CI is

The conversion of sugar C

The oxidation state of C in C

Match List-I (Oxidation number) with List-II (The element) ad select the correct answer using the code given below the list :

The oxidation state of nitrogen in N

The oxidation state of Cr in [Cr(NH₃)₄CI₂]⁺ is

The oxidation state of C in C₂H₁₂O₆ is

Oxidation state of Mn in acidic KMnO₄ change from is :

In (Ni [CO₄)] the oxidation state of Ni is

The oxidation state of oxygen of OF₂ is

Oxidation state of C in oxalic acid (H₂C₂O₄) is

The conversion of sugar C₁₂H₂₂O₁₁ CO₂ is

Oxidation number of fluorine in F₂O is

The oxidation state of nitrogen in N₃H is

Consider the following statements
1. Phosphorous exhibits oxidation states of 3 and 5
2. Iron exhibits oxidation state + 2 and + 3
Which of the statement given above is/are correct ?

The brown ring complex compound is formulated as [Fe(H₂O)₅(NO)SO₄ the oxidation state of iron is

The conversion of Fe⁺⁺ to Fe⁺⁺⁺ is

Oxidation number of 'S' in Na₂S₄O₆ is

The oxidation state of Cr in K₂Cr₇ is

The oxidation number of Fe in K₄[Fe(CN₆)] is

The oxidation number and covalency of sulphur in S₈ is

The value of n in the following equation is Cr₂O^2-₇ + 14H⁺ + ne 2 Cr³⁺ + 7H₂O⁺

The oxidation number of iron in Fe₃O₄ is

The oxidation number of nitrogen is NO^-₃ is

Oxidation number of N in NH₄NO₃ is

The redox reaction, Na₂S₂O₃ changes to Na₂S₄O₆
What is the equivalent-weight of Na₂S₃O₃ ?

What is the oxidation number of sulphur in SO^2-₄ ion