1. What gas is evolved when dilute sulphuric acid is added to Zinc?   Sulphur Dioxide   Argon   Hydrogen   Hydrogen Peroxide   Hint Half-n-half Clue   2. Catalysts often speed up certain chemical reactions.   False   True   3. Solubility of a substance in a solvent usually increases with an increase in temperature.   True   False   4. If no more solute can be dissolved in a solvent at a given temperature then that solution is called   A Dispersed Solution   A Saturated Solution   An Unstable Solution   A Real Solution   Half-n-half Clue   5. A substance that absorbs moisture is known as   Hygroscopic   Hydrophilic   Hydrophobic   Amorphous   Half-n-half Clue   6. Lemon juice is   Neutral   Basic   Metallic   Acidic   Half-n-half Clue   7. Which of the following is a chemical change?   Boiling of water   Dissolving of salt in water   Rusting of iron   Freezing of water   Half-n-half Clue