1. What gas is evolved when dilute sulphuric acid is added to Zinc?   Hydrogen   Argon   Hydrogen Peroxide   Sulphur Dioxide   Hint Half-n-half Clue   2. Catalysts often speed up certain chemical reactions.   False   True   3. Lemon juice is   Metallic   Acidic   Neutral   Basic   Half-n-half Clue   4. Which of the following is a chemical change?   Freezing of water   Rusting of iron   Boiling of water   Dissolving of salt in water   Half-n-half Clue   5. A pH of below 7 indicates   Presence of Ions   Acidity   Alkalinity   Purity of the sample   Half-n-half Clue   6. Solubility of a substance in a solvent usually increases with an increase in temperature.   True   False   7. Fill in the missing word Acid + _______ = Salt + Water   Non Metal   Metal   Oxygen   Base   Half-n-half Clue