1. Which of the following is not a physical change?   Decantation   Distillation   Oxidation   Precipitation   Hint Half-n-half Clue   2. Which of the following gases is green in color?   Chlorine   Hydrogen   Krypton   Neon   Half-n-half Clue   3. Which of the following is a chemical change?   Boiling of water   Rusting of iron   Freezing of water   Dissolving of salt in water   Half-n-half Clue   4. A substance that absorbs moisture is known as   Amorphous   Hydrophobic   Hygroscopic   Hydrophilic   Half-n-half Clue   5. Acids change a litmus paper from   Red to Purple   Blue to Red   Red to Blue   Green to White   Half-n-half Clue   6. What is the combination of any substance with oxygen known as?   Combustion   Hydrogenation   Oxidation   Reduction   Half-n-half Clue   7. Fill in the missing word Acid + _______ = Salt + Water   Base   Oxygen   Non Metal   Metal   Half-n-half Clue