🧪 Chemical Reactions and Equations – MCQs (Class 10)
- What is the chemical formula of quick lime?
A. Ca(OH)₂
B. CaCO₃
C. CaO
D. CaCl₂
- Which of the following is a displacement reaction?
A. Zn + H₂SO₄ → ZnSO₄ + H₂
B. NaOH + HCl → NaCl + H₂O
C. CaCO₃ → CaO + CO₂
D. AgNO₃ + NaCl → AgCl + NaNO₃
- Rusting of iron is an example of:
A. Combination reaction
B. Decomposition reaction
C. Oxidation reaction
D. Displacement reaction
- What is observed when calcium oxide is added to water?
A. A red solution is formed
B. A hissing sound and heat are produced
C. No change
D. Blue solution forms
- The reaction in which heat is absorbed is called:
A. Exothermic
B. Endothermic
C. Thermal
D. Neutralisation
- Which gas is evolved when zinc reacts with dilute sulphuric acid?
A. Oxygen
B. Hydrogen
C. Carbon dioxide
D. Nitrogen
- Which of the following reactions is a decomposition reaction?
A. Fe + CuSO₄ → FeSO₄ + Cu
B. CaO + CO₂ → CaCO₃
C. 2H₂O → 2H₂ + O₂
D. NaOH + HCl → NaCl + H₂O
- Which of the following is not a physical change?
A. Melting of ice
B. Boiling of water
C. Burning of paper
D. Dissolving salt in water
- The brown colour of iron turning reddish-brown is due to:
A. Burning
B. Corrosion
C. Reduction
D. Neutralisation
- A reaction in which two or more substances combine to form a single product is called:
A. Combination reaction
B. Displacement reaction
C. Decomposition reaction
D. Redox reaction
- Which of the following is used in black and white photography?
A. AgNO₃
B. AgBr
C. CuSO₄
D. NaCl
- Which type of reaction is:
2KClO₃ → 2KCl + 3O₂
A. Displacement
B. Decomposition
C. Combination
D. Double displacement
- Which of the following is a chemical change?
A. Boiling water
B. Cutting paper
C. Rusting of iron
D. Freezing of water
- What type of chemical reaction takes place when electricity is passed through water?
A. Combination
B. Displacement
C. Decomposition
D. Neutralisation
- Which metal does not react with dilute HCl?
A. Magnesium
B. Aluminium
C. Copper
D. Zinc
- What is the colour of ferrous sulphate crystals?
A. White
B. Green
C. Blue
D. Pink
- Which reaction is known as a redox reaction?
A. Only oxidation
B. Only reduction
C. Both oxidation and reduction occur
D. Acid-base reaction
- The white precipitate formed when AgNO₃ reacts with NaCl is:
A. Ag
B. AgCl
C. NaNO₃
D. NaCl₂
- Which of the following is an example of an exothermic reaction?
A. Electrolysis of water
B. Melting of ice
C. Burning of magnesium ribbon
D. Photosynthesis
- Which process is used to prevent rusting of iron?
A. Oxidation
B. Galvanization
C. Decomposition
D. Sublimation
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