(i) 2HgO → 2Hg + O2
(iii) 4Al + 3MnO2→ 2Al2O3 + 3Mn
(iv) FeO3 + 2Al → 2Fe + Al2O3
(v) ZnCO3→ ZnO + CO2
Mg + Cl2→ MgCl2
(II) Ionic compounds: are formed when atoms of different charges (i.e. positive and negative ions) come together and transfer electron. These ionic bonds are typically very strong due to the high attractive forces holding the positively and negatively charged ions together (called electrostatic forces of attraction).
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