1. Rocks that are rich in metals are known as _______.   metalloids   ores   allotropes   slag   Hint Half-n-half Clue   2. Metals are obtained from their oxides by the process of _______.   oxidation   roasting   electrolytic separation   reduction   Half-n-half Clue   3. If a metal's ore is titled 'pyrites', then it most probably contains _______.   oxygen   sulfur   chlorine   nitrogen   Half-n-half Clue   4. Rust on iron is basically _______.   a sulphide   an oxide   a chloride   a nitride   Half-n-half Clue   5. Which of the following metals is often found in the pure state?   Magnesium   Gold   Iron   Aluminum   Half-n-half Clue   6. Which of the following metals is a liquid at room temperature?   Cadmium   Mercury   Sodium   Tungsten   Half-n-half Clue   7. To prevent corrosion, metals are often galvanized by covering them with a layer of _______.   tin   copper   sodium   zinc   Half-n-half Clue