QQuestionChemistry
QuestionChemistry
Which of the following is an example of a double replacement reaction?
(a) 3Fe+ 2O 2→Fe^3O^4
(b) BaCl^2 +K^2CO^3→BaCO^3 + 2KCl
(c) NiCO^3→NiO+CO^2
(d) Cl^2 + 2NaBr→2NaCl+Br^2
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Answer
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Step 1:I'll solve this step by step using the specified formatting guidelines:
Step 2:: Understand Double Replacement Reactions
AB + CD \rightarrow AD + CB
A double replacement reaction (also called double displacement) involves two compounds exchanging ions to form two new compounds. The general form is:
Step 3:: Analyze Each Option
(d) $$Cl_2 + 2NaBr \rightarrow 2NaCl + Br_2
Let's examine each reaction carefully: • This is a synthesis (combination) reaction, not a double replacement • Involves elements combining to form a compound • Barium and potassium switch partners • Meets the criteria of a double replacement reaction • This is a decomposition reaction • Single compound breaks down into two simpler substances • This is a single displacement reaction • Chlorine displaces bromine from sodium bromide
Step 4:: Identify the Correct Answer
The only double replacement reaction is option (b).
Final Answer
(b) BaCl_2 + K_2 CO_3 \rightarrow BaCO_3 + 2KCl
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