Class 10 Science common misconceptions

Common NCERT Class 10 Science misconceptions across 13 chapters, from Chemical Reactions and Equations to Our Environment: the tempting mistake, why it feels right, and a worked visual example.

How to teach Class 10 Science · Class 10 Science questions with answers

• Chapter 1: Chemical Reactions and Equations

  Can balancing change a chemical formula? — Tempting mistake: “Write NH₃ as NH₆ to account for all six hydrogen atoms.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 2: Acids, Bases and Salts

  Does one pH step mean one equal unit of acidity? — Tempting mistake: “A solution at pH 3 has twice the hydrogen ion concentration of pH 6.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 3: Metals and Non-metals

  Do all metals react with water in the same way? — Tempting mistake: “Copper reacts with cold water like sodium because both are metals.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 4: Carbon and its Compounds

  Can a double bond count as just one bond toward carbon’s valency? — Tempting mistake: “Each carbon in ethene makes only three bonds.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 5: Life Processes

  Does photosynthesis release oxygen taken from carbon dioxide? — Tempting mistake: “The oxygen gas comes from carbon dioxide because CO₂ contains oxygen.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 6: Control and Coordination

  Is a reflex a deliberate decision? — Tempting mistake: “You think about moving your hand before a withdrawal reflex.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 7: How Do Organisms Reproduce?

  Does regrowing a body part count as reproduction? — Tempting mistake: “A lizard reproduces when it regrows a lost tail.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 8: Heredity

  Does dominant mean more common? — Tempting mistake: “A dominant allele must be found in most people.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 9: Light - Reflection and Refraction

  Does a convex lens always form a real image? — Tempting mistake: “A converging lens always projects an image onto a screen.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 10: The Human Eye and the Colourful World

  Which lens corrects near-sightedness? — Tempting mistake: “Near-sightedness needs a converging lens to make distant objects clear.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 11: Electricity

  Does a larger series resistor use up more current? — Tempting mistake: “Less current flows just after a 4 Ω resistor than just after a 2 Ω resistor in the same series loop.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 12: Magnetic Effects of Electric Current

  Does reversing current reverse the magnetic field? — Tempting mistake: “The compass deflects the same way after reversing the current.”

  1 worked visual example · 8 “If your child says…” checks

• Chapter 13: Our Environment

  Does energy increase higher up a food chain? — Tempting mistake: “Top predators receive the most energy because they eat other animals.”

  1 worked visual example · 8 “If your child says…” checks