Question Bank: Redox Reactions | Chemistry Class 11 - NEET PDF Download

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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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