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  4. Redox Reactions Chapter-Wise Test 9

Redox Reactions Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the oxidation number of iodine in \( \ce{IF7} \)?

Let I = \( x \). F = -1. Equation: \( x + 7(-1) = 0 \), \( x - 7 = 0 \), \( x = +7 \).

+5
+3
+1
+7
4

In \( \ce{2Tl + I2 -> 2TlI} \), which species undergoes oxidation?

Tl (0) becomes +1 in \( \ce{TlI} \), losing electrons, while I (0 to -1) is reduced.

\( \ce{Tl} \)
\( \ce{I2} \)
\( \ce{TlI} \)
None of these
1

In the reaction \( \ce{2MnO2 + 4KOH + O2 -> 2K2MnO4 + 2H2O} \), how many electrons are transferred per Mn atom?

Mn (+4 in \( \ce{MnO2} \)) becomes +6 in \( \ce{K2MnO4} \). Change = +6 - (+4) = 2 electrons per Mn.

1
3
4
2
4

What is the oxidation number of phosphorus in \( \ce{P2O5} \)?

Let P = \( x \). O = -2. Equation: \( 2x + 5(-2) = 0 \), \( 2x - 10 = 0 \), \( x = +5 \).

+5
+3
+2
-5
1

In \( \ce{2KMnO4 + 16H2SO4 + 10NaBr -> 5Br2 + 2MnSO4 + 8H2O + 5Na2SO4 + K2SO4} \), how many electrons are transferred?

Mn (+7 to +2): 2 Mn gain 10 electrons. Br (-1 to 0): 10 Br lose 10 electrons. Total = 10.

8
12
6
10
4

Which of the following is a decomposition redox reaction?

In \( \ce{2HgO -> 2Hg + O2} \), Hg (+2 to 0) is reduced, and O (-2 to 0) is oxidized.

\( \ce{CaCO3 -> CaO + CO2} \)
\( \ce{2NaCl -> 2Na + Cl2} \)
\( \ce{KClO3 -> KCl + O2} \)
\( \ce{2HgO -> 2Hg + O2} \)
4

Which element shows fractional oxidation state in \( \ce{Fe3O4} \)?

In \( \ce{Fe3O4} \) (mixed oxide of FeO and \( \ce{Fe2O3} \)), Fe has states +2 and +3, averaging to +8/3.

Oxygen
Hydrogen
Sulfur
Iron
4

In the reaction \( \ce{2FeSO4 -> Fe2O3 + SO2 + SO3} \), which element is oxidized?

S (+6 in \( \ce{FeSO4} \)) becomes +4 in \( \ce{SO2} \) and +6 in \( \ce{SO3} \), but Fe (+2 to +3) is oxidized.

Sulfur
Oxygen
Iron
None of these
3

Which of the following reactions demonstrates the addition of oxygen, indicating an oxidation process?

Oxidation involves oxygen gain. In \( \ce{2Cu + O2 -> 2CuO} \), Cu (0) gains oxygen to become Cu (+2), indicating oxidation.

\( \ce{2Cu + O2 -> 2CuO} \)
\( \ce{2H2O -> 2H2 + O2} \)
\( \ce{FeSO4 + H2 -> Fe + H2SO4} \)
\( \ce{PbS + O3 -> PbSO4} \)
1

Which of the following reactions is not a redox reaction?

In \( \ce{FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl} \), no element changes oxidation state (Fe: +3, Na: +1, Cl: -1, O: -2, H: +1).

\( \ce{2H2 + O2 -> 2H2O} \)
\( \ce{Zn + 2HCl -> ZnCl2 + H2} \)
\( \ce{FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl} \)
\( \ce{2Cu + O2 -> 2CuO} \)
3

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