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chemistry igcse acapprinted 129 · PDF 129
145 pagesrevision 46934
printed 129 · PDF 129
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129
Q4. 0620_s23_qp_23
ANS: The correct answer is D, because Magnesium oxide is an ionic compound that conducts electricity
when molten, due to the free movement of ions which act as carriers of charge (option 2). Option 1 is not
correct because their size depends on the charge on the nucleus. Option 3 is incorrect because the forces of
attraction are between oppositely charged ions, not ions and delocalized electrons.
Q5. 0620_s23_qp_23
ANS: The correct answer is B, because In CH4, the central carbon atom containing four electrons, is
bonded with four hydrogen atoms, so all four of the carbon’s outer shell electrons are bonded to the four
hydrogen atoms covalently.