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11. An alloy containing mercury is called what a. amalgam b. alum c.carnallite d. buffer.
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12. The most active non-metal is a. sulphur b. carbon c. fluorine d. oxygen.’
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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.
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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).
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15. Another name for eardrum is a. perilymp b. stapes c. external auditory meatus d. tympanic membrane.
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