CBSE Class 12 Biology Sample Paper 2025-26 with Detailed Solutions
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Which reaction is a redox reaction?
Anonymous Quiz
30%
HCl + NaOH → NaCl + H₂O
27%
AgNO₃ + NaCl → AgCl + NaNO₃
33%
Zn + CuSO₄ → ZnSO₄ + Cu
10%
BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl
❤4
In a redox reaction, oxidation involves:
Anonymous Quiz
33%
Gain of electrons
52%
Loss of electrons
11%
Gain of protons
4%
Loss of neutrons
❤4
Reduction is defined as:
Anonymous Quiz
24%
Addition of oxygen
28%
Loss of hydrogen
42%
Gain of electrons
6%
Increase in oxidation number
🤗2
Oxidizing agent is a substance that:
Anonymous Quiz
29%
Gains electrons
38%
Loses electrons
12%
Is reduced
21%
Both A and C
❤3
Which of the following represents oxidation?
Anonymous Quiz
19%
Cl₂ → 2Cl⁻
52%
Fe²⁺ → Fe³⁺
23%
Cu²⁺ → Cu
6%
H₂ → 2H⁺
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In the reaction: Zn + H₂SO₄ → ZnSO₄ + H₂, the reducing agent is:
Anonymous Quiz
32%
Zn
41%
H₂SO₄
21%
H⁺
6%
SO₄²⁻
❤2
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❤1
Which of the following has the highest oxidation number?
Anonymous Quiz
48%
Mn in KMnO₄
42%
Cr in Cr₂O₇²⁻
8%
N in NH₃
3%
Cl in Cl₂
👍2❤1🔥1🥰1🏆1
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🤗1
Which of the following is both oxidized and reduced in the same reaction (disproportionation)?
Anonymous Quiz
27%
Cl₂
29%
Fe
31%
H₂S
14%
NH₃
Which element undergoes reduction in the reaction: CuO + H₂ → Cu + H₂O?
Anonymous Quiz
53%
Cu
21%
H
14%
O
13%
CuO
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