1. Metals are usually good conductors of heat and electricity.   True   False   2. Rust on iron is basically _______.   an oxide   a nitride   a chloride   a sulphide   Hint Half-n-half Clue   3. Brass is _______.   an alloy   a compound   an element   a mixture   Half-n-half Clue   4. Which metal is extracted from the ore 'bauxite'?   Gold   Iron   Tungsten   Aluminum   Half-n-half Clue   5. Which of the following does not belong to this group?   Sodium   Oxygen   Iron   Lead   Half-n-half Clue   6. Rocks that are rich in metals are known as _______.   metalloids   ores   allotropes   slag   Half-n-half Clue   7. Which of the following metals is often found in the pure state?   Aluminum   Gold   Magnesium   Iron   Half-n-half Clue