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Free Balancing Redox Equations MCQs with Answers

9 Balancing Redox Equations MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Redox equations are balanced by tracking electron loss and gain through oxidation numbers or the ion-electron method. Work includes identifying oxidizing and reducing agents, balancing atoms and charge in acidic or basic medium, and ensuring that electrons lost equal electrons gained.

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9 questions

1. When balancing a redox equation by the ion electron method, the two half equations must be multiplied so that

  • A. the number of atoms of oxygen is the same in both
  • B. the number of electrons lost equals the number gained
  • C. the charges on both sides are zero
  • D. the coefficients are all whole numbers greater than one

Explanation: Electrons cannot appear in the final equation, so the two half equations are scaled until the electrons cancel exactly on addition, which…

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Correct answer: the number of electrons lost equals the number gained

2. In balancing a redox equation in acidic medium, oxygen atoms are balanced by adding

  • A. hydroxide ions
  • B. oxygen gas
  • C. water molecules to the side deficient in oxygen
  • D. hydrogen gas

Explanation: Water supplies the missing oxygen, and hydrogen ions are then added to the opposite side to balance the hydrogen introduced, which is…

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Correct answer: water molecules to the side deficient in oxygen

3. In acidic medium, ____ is used to balance oxygen atoms in an ionic equation.

  • A. H+
  • B. OH-
  • C. H2O
  • D. O

Explanation: In the half-reaction method in acidic medium, H2O is added to the side deficient in oxygen atoms, and H+ is then used to balance hydrogen…

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Correct answer: H2O

4. The easy way of balancing the chemical equation is_________?

  • A. according to atom's atomic number.
  • B. According to atom's atomic mass.
  • C. First we balance Metal than non-metal than Hydrogen than Oxygen.
  • D. None of the above

Explanation: For many ordinary equations, a convenient inspection order is to balance metals first, then other nonmetals, followed by hydrogen and…

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Correct answer: First we balance Metal than non-metal than Hydrogen than Oxygen.

5. Consider the following redox reaction. Zn+dil HNO3? Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is__________________?

  • A. 6
  • B. 8
  • C. 10
  • D. 4

Explanation: Let the equation be aZn + bHNO3 → aZn(NO3)2 + cN2O + dH2O. Hydrogen gives d = b/2, nitrogen gives b = 2a + 2c, and oxygen then gives 3b =…

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Correct answer: 10

6. If we balanced the following reaction, what is the net ionic charge on the right side of the equation? H+ + MnO4- + Fe2+ →Mn2+ + Fe3+ + H2O

  • A. +5
  • B. +7
  • C. +10
  • D. +17

Explanation: To solve this problem, we must balance the redox reaction by ensuring that both mass and charge are conserved.

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Correct answer: +17

7. In ion electron method of balancing, equations are:

  • A. Written with oxidation numbers of constituents
  • B. Split into two half reactions
  • C. Only oxidation part is written
  • D. Only reducing part is written

Explanation: The ion-electron method, or the half-reaction method, is a systematic approach to balancing redox reactions.

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Correct answer: Split into two half reactions

8. Number of electrons added on both sides of oxidation and reduction half reactions are balanced _.

  • A. At the start of procedure
  • B. Somewhere in the middle of balancing
  • C. After adding two half reactions
  • D. Before adding two half reactions

Explanation: A redox equation can be balanced using the following stepwise procedure: (1) Divide the equation into two half-reactions.

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Correct answer: Before adding two half reactions

9. -OH is added when the reaction is in_?

  • A. Acidic Medium
  • B. Basic Medium
  • C. Neutral solution
  • D. All of these

Explanation: The addition of OH⁻ ions can happen in all three scenarios - acidic, basic, and neutral solutions.

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Correct answer: All of these
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Balancing Redox Equations MCQs: common questions

Are these Balancing Redox Equations MCQs free?

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There are 9 Balancing Redox Equations MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.

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