MCQ Practice – Class 6 to 10

Q1. Which reaction absorbs heat?

A. Endothermic B. Neutralisation C. Exothermic D. Combustion

Q2. Which gas turns lime water milky?

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

Q3. What is a chemical reaction?

A. A process of dissolving substances B. A process of melting solids C. A process that changes physical state only D. A process in which new substances are formed

Q4. Which reaction is used in black and white photography?

A. Reduction of silver ions B. Displacement involving silver C. Combination D. Combustion

Q5. What type of change is burning of magnesium ribbon?

A. Physical B. Both physical and chemical C. Chemical D. Neutralisation

Q6. Which metal does NOT react with cold water?

A. Sodium B. Calcium C. Iron D. Potassium

Q7. Which symbol represents evolution of gas?

A. (s) B. (g) C. (↑) D. (l)

Q8. The reaction between acid and base is called:

A. Oxidation B. Neutralisation C. Combination D. Displacement

Q9. Which reaction forms a precipitate?

A. 2Mg + CO2 → 2MgO B. Cu + O2 → CuO C. H2 + O2 → H2O D. NaCl + AgNO3 → AgCl + NaNO3

Q10. Which is a redox pair?

A. Oxidation and reduction occurring together B. Only oxidation C. Only reduction D. Neither oxidation nor reduction

Quiz – Chemical Reactions and Equations