Reaction Type Detective
Five mystery reactions — one of each NCERT type. Add the right trigger (Heat, Electricity, Sunlight, or Mix) to make each reaction happen, observe the products, then classify each as Combination, Decomposition, Displacement, Double Displacement, or Oxidation-Reduction.
How It Works
Five Mystery Reactions
Tubes A, B, C, D, E each contain a different set of reactants — one of each NCERT reaction type. Identify which is which.
Add the Right Trigger
Each reaction needs a specific trigger to start: 🔥 Heat, ⚡ Electricity, ☀️ Sunlight, or 🔄 Mix. The wrong trigger does nothing — read the reactants and predict what's needed.
Observe the Products
Watch for color changes (blue→green in displacement), gas bubbles (CO₂ in decomposition), precipitates (white BaSO₄ in double displacement), or temperature changes (hot tube in combination).
Classify Each Reaction
Based on your observations, label each tube: Combination (A+B→AB), Decomposition (AB→A+B), Displacement (more reactive kicks out less reactive), Double Displacement (ion exchange), or Oxidation-Reduction (redox).
Reaction Key
Pattern: A + B → AB (two or more reactants → one product)
Often exothermic (tube gets hot)
Example: CaO + H₂O → Ca(OH)₂
Pattern: AB → A + B (one reactant → two or more products)
Requires energy input: heat / electricity / sunlight
Example: CaCO₃ →heat→ CaO + CO₂↑
Pattern: A + BC → AC + B (more reactive element displaces less reactive)
Color change + metal deposit
Example: Fe + CuSO₄ → FeSO₄ + Cu
Pattern: AB + CD → AD + CB (ion exchange between two compounds)
Usually forms a precipitate, gas, or water
Example: Na₂SO₄ + BaCl₂ → BaSO₄↓ + 2NaCl
Pattern: Simultaneous oxidation (loss of e⁻/H, gain of O) + reduction (gain of e⁻/H, loss of O)
Often a color change in a solid
Example: CuO + H₂ → Cu + H₂O