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LEARNERS HABITAT
1] A, B and C are three elements forming a part of compound in oxidation states of +2, +5
and  –2 respectively. What could be the compound?
a) A
2
(BC)
2
b) A
2
(BC
4
)
3
c) A
3
(BC
4
)
2
d) AB
2] Equivalent mass of oxidising agent in the reaction, SO
2
 + 2H
2
S ? 3S + 2H
2
O is
a) 32 b) 64 c) 16 d) 8
3] In which of the following compound, iodine is in its highest oxidation state?
a) KI b) KIO
4
c) KI
3
d) IF
5
4] (NH
4
)
2
Cr
2
O
7 
? Cr
2
O
3 
+ N
2
 + 4H
2
O
In the above reaction the oxidation state of  N and chromium changes respectively as
a) – 3 to 0 and + 6 to + 3 b) + 3 to 0 and + 3 to 6
c) – 4 to 0 and + 6 to 2 d) unpredictable
5] Which of the following reaction is not a redox reaction?
a) SO
2
 + 2H
2
S ? 2H
2
O + S b) Na + O
2
 ? Na
2
O
2
c) Na
2
O + H
2
SO
4
 ? Na
2
SO
4
 + H
2
O d) 4KClO3 ? 3KClO
4
 + KCl
6] The correct oxidation number of phosphorus in magnesium pyrophosphate [Mg
2
P
2
O
7
]
is
a) +2 b) +3 c) –3 d) +5
7] In which one of the following compounds the oxidation number of oxygen is positive
a) H
2
O
2
b) Na
2
O
2
c) OF
2
d) H
2
O.
8] The change in the oxidation number of Pb and Cl in the reaction,
PbO
2
 + Cl
-
? ClO
-
 + Pb
3
( ) OH
?
respectively are
a) +2, +2 b) -2, +2 c) +2, -1 d) -2, +1
9] Which of the following elements has least oxidation number?
a) Ni(CN)
4
b) Ni(CO)
4
c) Fe
2
O
3
d) SF
6
REDOX REACTION
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FAQs on Question Bank: Redox Reactions - Chemistry Class 11 - NEET

1. What is a redox reaction?
Ans. A redox reaction is a chemical reaction involving the transfer of electrons between two chemical species, where one species is oxidized (loses electrons) and the other is reduced (gains electrons).
2. What are some common examples of redox reactions?
Ans. Some common examples of redox reactions include the combustion of fuels (such as gasoline), the rusting of iron, and the reaction of bleach with hydrogen peroxide.
3. How can you identify a redox reaction?
Ans. One way to identify a redox reaction is to look for changes in the oxidation states of the elements involved. If an element's oxidation state increases, it is being oxidized, while if its oxidation state decreases, it is being reduced.
4. What is the importance of redox reactions in biological systems?
Ans. Redox reactions play a crucial role in biological systems, including photosynthesis, respiration, and the metabolism of nutrients. These reactions are essential for producing ATP, the energy currency of cells, and for maintaining the balance of ions and molecules inside and outside of cells.
5. How are redox reactions used in industry?
Ans. Redox reactions are used in a variety of industrial processes, including the production of metals (such as aluminum) and the synthesis of chemicals (such as fertilizers and pharmaceuticals). They are also used in batteries and fuel cells to generate electricity.
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