Redox Reactions NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Redox Reactions MCQ Questions


1.
What is the oxidation state of Mn in KMnO₄?
A.
2
B.
4
C.
7
D.
6
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ANSWER :
C. 7
2.
Which of the following is a redox reaction?
A.
H₂ + Cl₂ → 2HCl
B.
NaOH + HCl → NaCl + H₂O
C.
AgNO₃ + NaCl → AgCl + NaNO₃
D.
NH₃ + HCl → NH₄Cl
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ANSWER :
A. H₂ + Cl₂ → 2HCl
3.
In the reaction Zn + CuSO₄ → ZnSO₄ + Cu, which species is oxidized?
A.
Zn
B.
Cu
C.
Cu²⁺
D.
SO₄²⁻
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ANSWER :
A. Zn
4.
In redox reactions, reduction involves
A.
Gain of electrons
B.
Loss of electrons
C.
Loss of protons
D.
Gain of neutrons
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ANSWER :
A. Gain of electrons
5.
Which is a disproportionation reaction?
A.
2Na + Cl₂ → 2NaCl
B.
2H₂O₂ → 2H₂O + O₂
C.
H₂ + Cl₂ → 2HCl
D.
Ca + 2H₂O → Ca(OH)₂ + H₂
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ANSWER :
B. 2H₂O₂ → 2H₂O + O₂
6.
Which element shows variable oxidation states?
A.
Sodium
B.
Calcium
C.
Iron
D.
Neon
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ANSWER :
C. Iron