1. Rust on iron is basically _______.   a nitride   a sulphide   a chloride   an oxide   Hint Half-n-half Clue   2. To prevent corrosion, metals are often galvanized by covering them with a layer of _______.   sodium   copper   zinc   tin   Half-n-half Clue   3. Iron is magnetic in nature.   True   False   4. Which of the following metals is a liquid at room temperature?   Mercury   Sodium   Tungsten   Cadmium   Half-n-half Clue   5. If a metal's ore is titled 'pyrites', then it most probably contains _______.   nitrogen   oxygen   chlorine   sulfur   Half-n-half Clue   6. With which metal does oxygen combine to form rust?   Platinum   Silver   Iron   Gold   Half-n-half Clue   7. Metals are obtained from their oxides by the process of _______.   reduction   oxidation   electrolytic separation   roasting   Half-n-half Clue