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  4. Redox Reactions Chapter-Wise Test 13

Redox Reactions Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

In \( \ce{2K2Cr2O7 + 2H2O + 3S -> 4KOH + 2Cr2O3 + 3SO2} \), which element undergoes the largest decrease in oxidation number?

Cr (+6 in \( \ce{Cr2O7^2-} \)) to +3 in \( \ce{Cr2O3} \): -3. S (0) to +4 in \( \ce{SO2} \): +4. Cr decreases most.

Sulfur
Chromium
Oxygen
Potassium
2

In the reaction \( \ce{Mg + 2HCl -> MgCl2 + H2} \), what is the reducing agent?

The reducing agent donates electrons. \( \ce{Mg} \) (0) loses electrons to form \( \ce{Mg^2+} \) (+2), reducing \( \ce{H^+} \).

\( \ce{HCl} \)
\( \ce{Mg} \)
\( \ce{MgCl2} \)
\( \ce{H2} \)
2

What is the oxidation number of manganese in \( \ce{MnO2} \)?

Let Mn = \( x \). O = -2. Equation: \( x + 2(-2) = 0 \), \( x - 4 = 0 \), \( x = +4 \).

+2
+3
+6
+4
4

In the reaction \( \ce{3Cl2 + 6NaOH -> 5NaCl + NaClO3 + 3H2O} \), which species acts as the reducing agent?

The reducing agent is oxidized. Cl (0 in \( \ce{Cl2} \)) becomes +5 in \( \ce{NaClO3} \) and -1 in \( \ce{NaCl} \); \( \ce{Cl2} \) reduces itself.

\( \ce{NaOH} \)
\( \ce{Cl2} \)
\( \ce{NaCl} \)
\( \ce{NaClO3} \)
2

Which of the following is a redox reaction involving combination?

In \( \ce{N2 + O2 -> 2NO} \), N (0 to +2) is oxidized, and O (0 to -2) is reduced, forming one product.

\( \ce{N2 + O2 -> 2NO} \)
\( \ce{CaO + CO2 -> CaCO3} \)
\( \ce{HCl + NH3 -> NH4Cl} \)
\( \ce{NaOH + H2SO4 -> Na2SO4 + H2O} \)
1

Which reaction involves a displacement redox process?

In \( \ce{2K + ZnSO4 -> K2SO4 + Zn} \), K (0 to +1) is oxidized, and Zn (+2 to 0) is reduced, with K displacing Zn.

\( \ce{2NaCl + F2 -> 2NaF + Cl2} \)
\( \ce{CaO + H2O -> Ca(OH)2} \)
\( \ce{2K + ZnSO4 -> K2SO4 + Zn} \)
\( \ce{HCl + NaOH -> NaCl + H2O} \)
3

In the reaction \( \ce{2K + O2 -> K2O2} \), what is the oxidizing agent?

The oxidizing agent is reduced. \( \ce{O2} \) (0) gains electrons to become \( \ce{O^2-} \) (-1 in peroxide), oxidizing K.

\( \ce{O2} \)
\( \ce{K} \)
\( \ce{K2O2} \)
None of these
1

In the reaction \( \ce{2H2S + 3O2 -> 2SO2 + 2H2O} \), how many electrons are transferred per molecule of \( \ce{H2S} \)?

S (-2 in \( \ce{H2S} \)) becomes +4 in \( \ce{SO2} \). Change per S = +4 - (-2) = 6 electrons.

2
4
8
6
4

Which reaction demonstrates oxidation by the addition of oxygen to a non-metal without hydrogen involvement?

In \( \ce{P4 + 5O2 -> P4O10} \), P (0) gains oxygen to become +5 in \( \ce{P4O10} \), with no hydrogen present.

\( \ce{P4 + 5O2 -> P4O10} \)
\( \ce{CH4 + 2O2 -> CO2 + 2H2O} \)
\( \ce{2H2S + O2 -> 2S + 2H2O} \)
\( \ce{NH3 + O2 -> NO + H2O} \)
1

In \( \ce{2MnO2 + 4NaOH + O2 -> 2Na2MnO4 + 2H2O} \), what is the total number of electrons transferred per mole of \( \ce{MnO2} \)?

Mn (+4 in \( \ce{MnO2} \)) to +6 in \( \ce{Na2MnO4} \): 2 Mn atoms lose 2 × (6 - 4) = 4 electrons total. Per \( \ce{MnO2} \) = 4/2 = 2.

1
2
3
4
2

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