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ENTRANCE TEST – 2011 :: Discussion
| 18. | When elements of group II-A (alkaline earth metals) are exposed to air, they quickly become coated with a layer of oxide. What is the purpose of this oxide layer? | |
| A. | The oxide layer exposes the metal to Atmospheric attack | |
| B. | The oxide layer increases the reactivity of metal | |
| C. | The oxide layer protects the metal from further atmospheric attack | |
| D. | The oxide layer gives the metal a shiny silvery appearance | |
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