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Class 10 Science — Chapter 1: Chemical Reactions and Equations

68 practice questions · 23 Easy · 23 Medium · 22 Hard

Free NCERT-aligned multiple-choice practice for Class 10 Science, Chapter 1 (Chemical Reactions and Equations). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 68.

Sample questions

Q1Easy

Oxidation involves:

A.Loss of hydrogen / gain of oxygen✓ correct
B.Gain of hydrogen / loss of oxygen
C.No change in atoms
D.Only addition of metals
Why

Oxidation = gain of O / loss of H (or loss of electrons in modern terms).

Q2Medium

Balance: Fe + H₂O → Fe₃O₄ + H₂. The coefficients (in order) are:

A.3, 4, 1, 4✓ correct
B.1, 4, 3, 4
C.3, 4, 1, 1
D.1, 1, 1, 1
Why

3Fe + 4H₂O → Fe₃O₄ + 4H₂. Check: 3 Fe, 8 H, 4 O on each side.

Q3Hard

In the reaction CuO + H₂ → Cu + H₂O, the substance reduced is:

A.H₂
B.CuO✓ correct
C.Cu
D.H₂O
Why

CuO loses oxygen → reduction. H₂ gains oxygen → oxidation.

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