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8. Why is it important to polish the surfaces of alkaline earth metals before using them in experiments?

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To remove the oxygen on it


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.
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To prevent them from reacting with air
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To remove the oxide layer on it

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To remove the oxide layer formed when they react with oxygen
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To remove the oxide layer formed when they react with oxygen
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To remove the oxide layer

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To remove their metal oxides
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In order to remove the oxide layer formed when alkaline earth metals react with oxygen 
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In order to remove the oxide layer


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