Multiple Choice
Consider the reaction: Zn + Cu^{2+} → Zn^{2+} + Cu. What is being reduced in this reaction?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Hydrogen peroxide can decompose in the presence of which of the following substances?
A
Sodium chloride (NaCl)
B
Calcium carbonate (CaCO_3)
C
Manganese dioxide (MnO_2)
D
Glucose (C_6H_{12}O_6)
Verified step by step guidance1
Understand that hydrogen peroxide (H_2O_2) decomposes into water and oxygen gas, but this reaction is usually slow without a catalyst.
Recognize that a catalyst is a substance that speeds up a chemical reaction without being consumed in the process.
Identify which substances among the options are known catalysts for the decomposition of hydrogen peroxide. Manganese dioxide (MnO_2) is a well-known catalyst that accelerates this reaction.
Note that sodium chloride (NaCl), calcium carbonate (CaCO_3), and glucose (C_6H_{12}O_6) do not act as catalysts for this decomposition and therefore do not speed up the reaction.
Conclude that the presence of manganese dioxide (MnO_2) facilitates the rapid decomposition of hydrogen peroxide by providing an alternative reaction pathway with lower activation energy.
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