Class 10 · Science · 11 experiments
Pick an experiment to enter the virtual lab.
Hunt down the Acid & Base among 2 mystery solutions using ALL 10 NCERT Class 10 indicators — Litmus, Turmeric, China Rose, PhPh, MO, UI, Onion, Vanilla & Clove Oil.
NCERT Activity 2.1: Test dilute HCl, dilute H₂SO₄, and vinegar (CH₃COOH) with blue litmus paper. All three turn RED — they are all acids.
NCERT Activity 2.2: Test NaOH, KOH, and Ca(OH)₂ (limewater) with red litmus paper. All three turn BLUE — they are all bases.
NCERT Activity 2.3: Drop Mg, Zn, and Fe in dilute HCl. All release H₂ gas (rate: Mg > Zn > Fe). Pop test confirms H₂. Displacement reaction.
NCERT Activity 2.4: 2NaOH + Zn → Na₂ZnO₂ + H₂. Zinc (amphoteric) reacts with NaOH on warming. Pop test confirms H₂. Most metals do NOT react with bases.
NCERT Activity 2.5: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂↑. CO₂ turns lime water milky. Same reaction as baking soda + vinegar.
NCERT Activity 2.6: CuO + 2HCl → CuCl₂ + H₂O. Black CuO dissolves in HCl, solution turns blue-green. Basic oxide + acid = neutralisation.
NCERT Activity 2.7: 2NaOH + CO₂ → Na₂CO₃ + H₂O. CO₂ is an acidic oxide — it neutralises NaOH. Phenolphthalein pink → colourless. Mirror of Activity 2.6.
NCERT Activity 2.8: Add Universal Indicator to 6 mystery solutions (HCl, lemon, water, baking soda, milk of magnesia, NaOH). Match each colour to the pH scale 1-14.
NCERT Activity 2.9: Heat CuSO₄·5H₂O (blue) → CuSO₄ (white) + 5H₂O. Add water back → blue again. Reversible reaction. Concept: water of crystallization.
NCERT Activity 2.10: Heat gypsum (CaSO₄·2H₂O) at 373 K → Plaster of Paris (CaSO₄·½H₂O). Add water → sets back to hard gypsum. Used in casts & moulds.