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Redox reaction

Total questions: 40

Worksheet time: 2hrs 0mins

Name
Class
Date
1.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
2.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
3.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
4.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
5.

What are the coefficients when the equation is balanced?

a)

2 + 3 --> 2 + 3 + 4

b)

1 + 3 --> 1 + 3 + 2

c)

2 + 4 --> 2 + 3 + 2

d)

1 + 1 --> 1 + 1 + 1

6.
What are the coefficients when the equation is balanced?
a)
1 + 1 + 1 --> 2 + 1 + 3
b)
2 + 2 + 2 --> 4 + 2 + 3
c)
1 + 2 + 1 --> 2 + 2 + 3
d)
1 + 1 + 1 --> 1 + 1 + 1
7.

What is the oxidation number of N in NO2-1?

a)

-3

b)

+4

c)

-2

d)

+3

8.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
9.
What is oxidation number of H in CaH2?
a)
+1
b)
-1
c)
0
d)
+2
10.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
11.

Combustion and single-replacement reactions are __________ redox reactions.

a)

always

b)

never

c)

sometimes

d)

mostly

12.

What is the oxidation number of C in SrCO3?

a)

-4

b)

+2

c)

-6

d)

+4

13.

Substance that oxidizes another substance by accepting its electrons.

a)

reducing agent

b)

oxidation number

c)

combustion

d)

oxidizing agent

14.

What is the reducing agent here: N2 + 3H2 --> 2NH3

a)

N2

b)

H2

c)

NH3

d)

2NH3

15.

Which change is an oxidation?

a)

FeO to Fe2O3

b)

Fe2O3 to FeO

c)

H2O2 to H2O

d)

H2O to H2

16.

In the reaction, Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

a)

carbon monoxide is reduced

b)

carbon monoxide is the oxidising agent

c)

iron(III) oxide is oxidised

d)

iron(III) oxide is the oxidising agent

17.
a)

A

b)

B

c)

C

d)

D

18.

The value of x and y in the following redox reaction

xCl2+6OH- ----------->ClO- +yCl-+3H2O are (CPMT 2000)

a)

x = 2, y= 4

b)

x = 5,y = 3

c)

x = 3, y = 5

d)

x = 4, y = 2

19.

The oxidation state of sulphur in the anions SO32-, S2O42-and S2O62- follow the order (PMT 2003)

a)

S2O42- < SO32- < S2O62-

b)

SO32- < S2O42- < S2O62-

c)

S2O42- < S2O62- < SO32-

d)

S2O62-< S2O42-< SO32-

20.

The decolourisation of 1 mole of KMnO4,the moles of H2O2 required is

a)

1/2

b)

3/2

c)

5/2

d)

7/2

21.

Whenever KMnO4 acts as an oxidising agent and ultimately forms MnO42-.MnO2,Mn2O3 and Mn2+,then the number of electrons transferred in each case respectively is (AIEEE 2002)

a)

4,3,1,5

b)

1.5.3,7

c)

1,3,4,5

d)

3.5.7.1

22.

Among H2O2,H2O and O2,which one is stronger oxidising agent

a)

H2O2

b)

H2O

c)

O2

d)

All are equally strong

23.

Which of the following can act oxidising as well as reducing agent

a)

HNO3

b)

H2SO4

c)

H2S

d)

SO2

24.

Which of the following can acts only as oxidising agent?

a)

SO2

b)

H2O2

c)

SnCl2

d)

KMnO4

25.

What is the oxidation number of sulphur in perdisulphuric acid (H2S2O8)

a)

+7

b)

-7

c)

-2

d)

+6

26.

What is the oxidation number of chromium in CrO5

a)

+10

b)

+6

c)

-6

d)

+5

27.

What is the oxidation number of Br in Br3O8

a)

16

b)

2

c)

16/3

d)

7

28.

Which of the following species do not show disproportionate reaction and why

a)

ClO-

b)

ClO2-

c)

ClO3-

d)

ClO4-

29.

What is the oxidation number of Fe in K4[Fe(CN)6]

a)

+2

b)

+3

c)

0

d)

+6

30.

Predict the feasibility of the following reaction

Fe3+ +Cu ------------> Fe2+ +Cu2+

standard reduction potential of Cu and ferric ion are 0.34 and 0.77V respectively.

a)

Feasible

b)

not feasible

c)

may or maynot be feasible

d)

data insufficient

31.

The electrode potential of K+.Ag+,Hg2+,Mg2+ and Cr3+ are -2.93, 0.8, 0.79, -2.37and -0.74 respectively. Which of them is the strongest reducing agent

a)

Ag+

b)

K+

c)

Mg2+

d)

Cr3+

32.

Which ordering of compound is according to the decreasing order of oxidation state of nitrogen? (IIT JEE 2012)

a)

HNO3,NO,NH4Cl,N2

b)

HNO3,NO, N2,NH4Cl

c)

HNO3,NH4Cl,NO,N2

d)

NO,HNO3,NH4Cl,N2

33.

In the reaction

2MnO4- +10Cl-+16 H+ ---------->2Mn2+ +5Cl2+8H2O (IIT JEE 2011)

a)

MnO4- is reduced

b)

Cl- is reduced

c)

MnO4- acts as reducing agent.

d)

Cl- acts as oxidising agent

34.

Predict the product of electrolysis of aquous solution of AgNO3 with silver electrode.

a)

Ag at the cathode and Ag+ ion at the anode

b)

Ag at the cathode and O2 at anode

c)

H2 gas at the cathode and O2 gas at the anode

d)

Ag at the cathode and H2 at anode

35.

Predict the product of electrolysis of aquous solution of NaCl with platinum electrode.

a)

Na at cathode and chlorine gas at anode

b)

H2 at cathode and chlorine gas at anode

c)

H2 at cathode and chlorine gas at anode

d)

Na at cathode and H2 gas at anode

36.

Which of the following pairs of ions cannot coexist in aquous solution?

a)

Cr2+ and MnO4-

b)

Fe 3+ and Cr2O72-

c)

Cr2+ and I3-

d)

Mn2+ and Cl-

37.

Which of the following is an example of redox reaction?

a)

Fe2O3+3CO-------->2Fe +3CO2

b)

CuO + H2 -------> Cu + H2O

c)

2K + F2 ------->2KF

d)

BaCl2 + H2SO4--------> BaSO4+2HCl

38.

Identify the correct statements with reference to the given reaction (NCERT Exampler)

P4+3OH-+3H2O-------->PH3 + 3H2PO2-

a)

Phosphorous is undergoing reduction only.

b)

Phosphorous is undergoing oxidation only.

c)

Phosphorous is undergoing oxidation as well as reduction only

d)

Hydrogen is undergoing oxidation

39.

Which of the following electrodes will act as an cathode, when connected to SHE ? (NCERT Exampler)

a)

Al/Al3+ , reduction potential = -1.66 V

b)

Fe/Fe2+ , reduction potential = -0.44V

c)

Zn/Zn2+ ,reduction potential = -0.76 V

d)

F2/2F- ,reduction potential = +2.87V

40.

Calculate E0cell in which the following reaction occur

Zn +2Ag+ ----> Zn2+ +2Ag

Standard reduction potential of Zn2+ and Ag+ are -0.76 V and +0.34 V respectively.

a)

1.55 V

b)

0.42V

c)

-0.42V

d)

-1.55V

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