1. Which of the following does not belong to this group?   Oxygen   Sodium   Lead   Iron   Hint Half-n-half Clue   2. With which metal does oxygen combine to form rust?   Silver   Gold   Platinum   Iron   Half-n-half Clue   3. Iron is magnetic in nature.   True   False   4. An alloy is _______.   a mixture of three elements   a compound of three elements   a solid solution of two or more metals   an element in the impure form   Half-n-half Clue   5. If a metal's ore is titled 'pyrites', then it most probably contains _______.   oxygen   nitrogen   chlorine   sulfur   Half-n-half Clue   6. Which metal is extracted from the ore 'hematite'?   Aluminum   Manganese   Tin   Iron   Half-n-half Clue   7. To prevent corrosion, metals are often galvanized by covering them with a layer of _______.   zinc   tin   copper   sodium   Half-n-half Clue