Summary Class 10 Science NCERT Chapter 1: Chemical Reactions and Equations | Complete Reactions Cheat Sheet | CBSE 2026-27 | Last-Minute Revision Notes

NCERT Class 10 Science Chapter 1 – Chemical Reactions and Equations: Activities Chart

Activity Balanced Chemical
Observation Type of Reaction
No. Equation

Magnesium ribbon burns with a
Activity 2Mg(s) + O₂(g) →
dazzling white flame and forms white Combination Reaction
1.1 2MgO(s)
powder (magnesium oxide)

Lead nitrate decomposes on heating,
Activity 2Pb(NO₃)₂(s) → 2PbO(s)
brown fumes of NO₂ evolve, yellow Thermal Decomposition
1.2 + 4NO₂(g) + O₂(g)
solid of lead oxide forms

Activity Electrolysis of water produces hydrogen 2H₂O(l) → 2H₂(g) + Electrolytic
1.3 and oxygen gases O₂(g) Decomposition

White precipitate of barium sulphate BaCl₂(aq) + Na₂SO₄(aq)
Activity Double Displacement
forms on mixing BaCl₂ and Na₂SO₄ → BaSO₄(s)↓ +
1.4 Reaction (Precipitation)
solutions 2NaCl(aq)

Iron nail placed in copper sulphate
Activity Fe(s) + CuSO₄(aq) →
solution becomes brown, blue colour Displacement Reaction
1.5 FeSO₄(aq) + Cu(s)
fades

Zinc granules react with dilute sulphuric
Activity Zn(s) + H₂SO₄(aq) →
acid to produce hydrogen gas (bubbles Displacement Reaction
1.6 ZnSO₄(aq) + H₂(g)
seen)

Activity When copper is heated in air, black 2Cu(s) + O₂(g) →
Oxidation Reaction
1.7 coating of copper(II) oxide forms 2CuO(s)

Adding water to copper oxide and then
Activity CuO(s) + H₂(g) → Cu(s)
passing hydrogen gas reduces black Reduction Reaction
1.8 + H₂O(g)
CuO to reddish-brown Cu