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11. An alloy containing mercury is called what a. amalgam b. alum c.carnallite d. buffer.
12. The most active non-metal is a. sulphur b. carbon c. fluorine d. oxygen.’
13. Hydrogen is used for filling balloons because it a. rekindles a glowing splint b. is a product of water and oxygen c. is lighter than air d. can be prepared in the laboratory.
14. The oxides of these metals are soluble in water to form alkalis except one a. Iron (fe) b. calcium (ca) c. sodium (na) d.potassium(r).
15. Another name for eardrum is a. perilymp b. stapes c. external auditory meatus d. tympanic membrane.
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