Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

Chemistry Class 11

Class 11 : Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

The document Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev is a part of the Class 11 Course Chemistry Class 11.
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Q.1. What is the change in oxidation number of carbon in the following reaction?     (2020)
CH4(g) + 4Cl2(g) → CCl4(l) + 4HCl(g)
(a) -4 to +4
(b) 0 to -4 

(c) +4 to +4
(d) 0 to +4
Ans:
a
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

Q.2. Which of the following reactions are disproportionation reaction?    (2019)
(a) 2Cu+ → Cu2+ + Cu
(b) Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
(c) Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
(d) Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
Select the correct option from the following
A: (a) and (b) only
B: (a), (b) and (c)
C: (a), (c) and (d)
D: (a) and (d) only
Ans: 
A
Disproportionation reaction: The reaction in which same element/compound get oxidized and reduced simultaneously.
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

Q.3. The correct structure of tribromooctaoxide is    (2019)
A: Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
B: Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
C:Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
D: Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
Ans:
A
The correct structure is
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

Q.4. The correct order of N-compounds in its decreasing order of oxidation states is    (2018)
A: HNO3, NO, N2, NH4Cl
B: HNO3, NO, NH4Cl, N2
C: HNO3, NH4Cl, NO, N2
D: NH4Cl, N2, NO, HNO3
Ans:
A
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

Q.5. For the redox reaction
MnO4 + C2O42–+ H+ →Mn2+ + CO2 + H2O
the correct coefficients of the reactants for the balanced equation are        (2018)
MnO4–     C2O2–      H+
(1) 16          5               2
(2) 2           5              16
(3) 2          16              5
(4) 5          16              2
A: 1
B: 2
C: 3
D: 4
Ans:
B
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev    (1)
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev    (2)
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev

Q.6. The pair of compounds that can exist together is :    (2014)
A: 
HgCl2 ,SnCl2
B: FeCl2 ,KI
C: FeCl3,SnCl2
D:
FeCl2 ,SnCl2 
Ans: 
A
The compounds with lower oxidation number and which cannot reduce by one another can exist together. Thus, FeCl2 and SnCl2 can exist together as Fe2+ can not be reduced by Sn2+.

Q.7. In acidic medium H2O2 changes Cr2O7 to CrO5 which has two −O−O− bonds. Oxidation state of Cr in CrO5 is :    (2014)
A: +6
B: -10
C: +5
D: +3

Ans: A 
CrO5 has butterfly structure having two peroxo bonds.
Previous Year Questions (2014-20) - Redox Reactions Class 11 Notes | EduRev
Peroxo oxygen has -1 oxidation state.
Let oxidation state of Cr be 'x'
CrO: x + 4(-1) + 1 (-2) = 0 ⇒ x = + 6

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