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chemistry igcse acapprinted 131 · PDF 131
145 pagesrevision 46934
printed 131 · PDF 131
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131
Q8. 0620_w23_qp_23
ANS: The correct answer is D, because Magnesium and oxygen combine to make the compound MgO. In
MgO, the ionic bonding means that it is made up of a positive metal ion (magnesium), and a negative non-
metal ion (oxygen). In MgO, magnesium ions have a +2 charge, as they lose two electrons, while oxygen ions
have a -2 charge, meaning they gain two electrons.
Q9. 0620_w23_qp_23
ANS: The correct answer is C, because Both diamond and silicon(IV) oxide are giant covalent structures,
and do not have any free outer shell electrons in their central atoms, making them unable to conduct
electricity.