Multiple Choice
A reaction that involves the transfer of electrons from one molecule to another is referred to as:
108
views
6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Which of the following reactions is a redox reaction?
A
2Na + Cl_2 → 2NaCl
B
AgNO_3 + NaCl → AgCl + NaNO_3
C
HCl + NaOH → NaCl + H_2O
D
CaCO_3 → CaO + CO_2
Verified step by step guidance1
Understand that a redox reaction involves the transfer of electrons, which means there is a change in oxidation states of elements between reactants and products.
Examine the first reaction: \(2Na + Cl_2 \rightarrow 2NaCl\). Assign oxidation states: Na goes from 0 (elemental form) to +1 in NaCl, and Cl goes from 0 in \(Cl_2\) to -1 in NaCl. Since both oxidation states change, this is a redox reaction.
Look at the second reaction: \(AgNO_3 + NaCl \rightarrow AgCl + NaNO_3\). This is a double displacement reaction where ions exchange partners but oxidation states remain the same, so it is not a redox reaction.
Check the third reaction: \(HCl + NaOH \rightarrow NaCl + H_2O\). This is an acid-base neutralization with no change in oxidation states, so it is not a redox reaction.
Analyze the fourth reaction: \(CaCO_3 \rightarrow CaO + CO_2\). This is a decomposition reaction where calcium carbonate breaks down, but oxidation states of elements do not change, so it is not a redox reaction.
Related Videos
Related Practice
