10TH CBSE SCIENCE Chemical Reactions - QUIZ 2

🧪 Chemical Reactions & Equations

Different Set – 10 MCQs

Correct answers will be displayed only after submission.

1. Which substance is added during saponification to favour precipitation of soap?

A. Sodium chloride B. Calcium carbonate C. Copper sulphate D. Sodium bicarbonate

2. Which gas produces brown fumes when lead nitrate is thermally decomposed?

A. Oxygen B. Nitrogen dioxide C. Hydrogen D. Sulphur dioxide

3. Which sequence correctly represents the steps for determining water absorbed by raisins?

A. Soak → weigh dry → wipe → weigh soaked B. Weigh dry → soak → wipe → weigh soaked C. Weigh dry → wipe → soak → weigh soaked D. Soak → wipe → weigh dry → weigh soaked

4. Which pair of gases can be used to store fresh oil for a long time because they are inert?

A. Oxygen and carbon dioxide B. Nitrogen and oxygen C. Helium and nitrogen D. Hydrogen and oxygen

5. Which substance is decomposed by sunlight to form silver and chlorine?

A. Sodium chloride B. Silver chloride C. Potassium chloride D. Copper chloride

6. Which metal cannot displace magnesium from magnesium sulphate solution?

A. Aluminium B. Zinc C. Potassium D. Calcium

7. In the reaction 2FeCl₂ + Cl₂ → 2FeCl₃, chlorine acts as:

A. Reducing agent B. Oxidising agent C. Catalyst D. Inert medium

8. What is the ratio of hydrogen to oxygen by volume in water?

A. 1 : 2 B. 1 : 1 C. 2 : 1 D. 1 : 8

9. Which process does NOT involve a chemical reaction?

A. Digestion of food B. Respiration C. Burning of candle wax D. Melting of candle wax

10. Which of the following is the correct equation for magnesium burning in oxygen?

A. Mg + O₂ → MgO B. 2Mg + O₂ → 2MgO C. Mg + 2O₂ → MgO D. 2Mg + 2O₂ → MgO

Correct Answers

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