Q2 of 55 Page 169

Mention the formulas, names and physical states of the products in the following reactions:

(i) 2PbS(s) + 3O2(g)


(ii) MgCO3(s)


(iii) Fe2O3(s) + 3CO(g)


(iv) Fe2O3(s) + 2AI(s)


(v) 2AI(OH)3(s)


(vi) CaO(s) + SiO2(s)


(vii) K2O(s) + H2O(I)


(viii) Mg(s) + 2H2O(I)


(ix) Zn(s) + 2HCI(aq)


(x) Ca(s) + CI2(g)

i. 2PbS(s) + 302(g) 2PbO(s) + SO2(g)

PbO = Lead oxide


SO2 = Sulphur dioxide


ii. MgCO3(s) MgO(s) + CO2 (g)


MgO = Magnesium oxide


CO2 = Carbon dioxide


iii. Fe2O3(s) + 3CO (g) 2Fe(s) + 3CO2 (g)


Fe = Iron


CO2 = Carbon dioxide


iv. Fe2O3(s) + 2Al(s) 2Fe(l) + Al2O3(s)


Fe = Iron


Al2O3 = Alumina


v. 2Al(OH)3(s) Al2O3(s) + 3H2O(g)


Al2O3 = Alumina


H2O = Water


vi. CaO(s) + SiO2(s) CaSiO3 (l)


CaSiO3 = Calcium silicate


vii. K2O(s) + H2O (l) 2KOH (aq)


2KOH = Potassium hydroxide


vii. Mg(s) + 2H2O (l) Mg(OH)2(aq) + H2 (g)


Mg(OH)2 = Magnesium hydroxide


H2 = Hydrogen


ix. Zn(s) + 2HCl (aq) ZnCl2 (aq) + H2 (g)


ZnCl2 = Zinc chloride


H2 = Hydrogen


x. Ca(s) + Cl2 (g) CaCl2(s)


CaCl2 = Calcium chloride


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