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Q3. The resistivity of a conductor depends on:
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16%
Length
35%
Cross-sectional area
40%
Material and temperature
10%
Current through it
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Which reaction is a redox reaction?
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31%
HCl + NaOH → NaCl + H₂O
27%
AgNO₃ + NaCl → AgCl + NaNO₃
32%
Zn + CuSO₄ → ZnSO₄ + Cu
10%
BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl
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In a redox reaction, oxidation involves:
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34%
Gain of electrons
50%
Loss of electrons
11%
Gain of protons
4%
Loss of neutrons
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Reduction is defined as:
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24%
Addition of oxygen
28%
Loss of hydrogen
41%
Gain of electrons
7%
Increase in oxidation number
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Oxidizing agent is a substance that:
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29%
Gains electrons
38%
Loses electrons
13%
Is reduced
20%
Both A and C
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Which of the following represents oxidation?
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21%
Cl₂ → 2Cl⁻
49%
Fe²⁺ → Fe³⁺
24%
Cu²⁺ → Cu
6%
H₂ → 2H⁺
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In the reaction: Zn + H₂SO₄ → ZnSO₄ + H₂, the reducing agent is:
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32%
Zn
39%
H₂SO₄
23%
H⁺
6%
SO₄²⁻
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Which of the following has the highest oxidation number?
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46%
Mn in KMnO₄
42%
Cr in Cr₂O₇²⁻
8%
N in NH₃
3%
Cl in Cl₂
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Which of the following is both oxidized and reduced in the same reaction (disproportionation)?
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26%
Cl₂
30%
Fe
29%
H₂S
14%
NH₃
Which element undergoes reduction in the reaction: CuO + H₂ → Cu + H₂O?
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53%
Cu
23%
H
13%
O
12%
CuO