Q1. Assertion: Sodium hydroxide is a strong base.
Reason: It completely dissociates in water.

Q2. Assertion: Hydrochloric acid reacts with sodium carbonate to produce carbon dioxide.
Reason: Reaction produces a salt, water, and CO₂ gas.

Q3. Assertion: In ionic compounds, metals lose electrons.
Reason: Metals form cations by losing electrons to achieve stable electronic configuration.

Q4. Assertion: Acids turn blue litmus red.
Reason: Acids release OH⁻ ions in solution.

Q5. Assertion: Water of crystallization is part of the chemical formula.
Reason: It is chemically bonded in the compound.

Q6. Assertion: Carbon dioxide is acidic in nature.
Reason: CO₂ reacts with water to form carbonic acid.

Q7. Assertion: Hydrogen gas is liberated when zinc reacts with hydrochloric acid.
Reason: Zinc displaces hydrogen from the acid.

Q8. Assertion: Atomic number represents the number of protons.
Reason: Proton number defines the element’s identity.

Q9. Assertion: Acids react with metals to release hydrogen gas.
Reason: Hydrogen is displaced by the metal from the acid.

Q10. Assertion: Calcium carbonate decomposes on heating.
Reason: Heating releases CO₂ from CaCO₃.