MP Board · Class 10 · Science · Chemical Reactions and EquationsWhat is the coefficient of H₂O in the balanced equation: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O?
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Total Attempts: 31
Accuracy Rate: 54.8%
Step-by-Step Solution
Step 1: Write the un‑balanced equation
Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
Step 2: Count atoms on each side
- Calcium (Ca): 1 on both sides – already balanced.
- Carbon (C): 1 on both sides – already balanced.
- Oxygen (O): Left side = 2 (from OH) + 2 (from CO₂) = 4. Right side = 3 (in CaCO₃) + 1 (in H₂O) = 4.
- Hydrogen (H): Left side = 2 (from OH). Right side = 2 (in H₂O). All atoms are balanced with the coefficients shown.
Step 3: Identify the coefficient of H₂O
Since the equation is already balanced, the coefficient in front of H₂O is 1.
Correct option: B
Detailed Options Breakdown
Option : 2
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Reactions and Equations.
Option 1: 1 (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 2: 3
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Reactions and Equations.
Option 3: 4
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Reactions and Equations.
💡 Study Guide: This question tests core syllabus concepts from Chemical Reactions and Equations. For formulas, key summaries, and mock exam reference guides, read the full Chemical Reactions and Equations Revision Notes.