1. A substance that speeds up the rate of a chemical reaction without undergoing any change itself is known as a _______.   cation   catalyst   counter ion   nucleus   Hint Half-n-half Clue   2. Lemon juice is _______ in nature.   metallic   acidic   basic   neutral   Half-n-half Clue   3. Acids turn blue litmus paper _______.   pink   colorless   yellow   red   Half-n-half Clue   4. Which of the following is not an acid?   H2SO4   NaOH   HNO3   HCl   Half-n-half Clue   5. The two allotropes of phosphorus are _______ and _______.   Alpha, Beta   Crystalline, Amorphous   Rhombic, Monoclinic   Red, Yellow   Half-n-half Clue   6. The lead of a pencil mainly contains _______.   carbon black   lead   graphite   plastics   Half-n-half Clue   7. Which of the following gases is green in color?   Chlorine   Neon   Hydrogen   Krypton   Half-n-half Clue