Question

multiple-choice question

in a double replacement reaction

positive ions in two compounds switch places with the negative ions in two compounds
two compounds switch places
positive ions in two compounds switch places or negative ions in two compounds switch places
two elements switch places

Explanation:

Define double replacement

A double replacement reaction is a chemical process where two ionic compounds exchange ions to form two new compounds.

Analyze the options

• Option 1: "positive ions in two compounds switch places with the negative ions in two compounds" — This is incorrect because positive ions switch with other positive ions (or negative with negative), not positive with negative.
• Option 2: "two compounds switch places" — This is too vague and does not describe the ionic exchange mechanism.
• Option 3: "positive ions in two compounds switch places or negative ions in two compounds switch places" — This is correct. When the positive ions (cations) swap partners, it is equivalent to the negative ions (anions) swapping partners, resulting in the mutual exchange of ionic partners.
• Option 4: "two elements switch places" — This describes a single replacement reaction, not a double replacement reaction.

Select the correct option

The third option accurately describes the mechanism of partner swapping in a double replacement reaction.

Answer:

• positive ions in two compounds switch places with the negative ions in two compounds
• two compounds switch places
• positive ions in two compounds switch places or negative ions in two compounds switch places (Correct answer)
• two elements switch places