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White silver chloride turns grey in sunlight. Photochemical Decomposition
\[\ce{2AgCl ->[Sunlight] 2Ag(s) + Cl2}\]
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Ferrous sulphate crystals decompose to ferric oxide, suphur dioxide, and sulphur trioxide. Thermal Decomposition
\[\ce{ { \color{#46e246}\ce{2FeSO4.7H2O}}->[\Delta]\underset{7H2O}{\underset{+}{2FeSO4}}->[\Delta]Fe2O3(s) + SO2(g) + SO3(g)}\]
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Heating lead nitrate produces lead oxide, nitrogen dioxide, and oxygen. Thermal Decomposition
\[\ce{2Pb(NO3)2(s)->[\Delta]{\color{#d6bd00} \ce{2PbO(s)}} + {\color{brown}\ce{4NO2(g)}} + O2(g)}\]
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Electrolysis of water. Electrolytic Decomposition
\[\ce{2H2O(l) -> 2H2(g) + O2(g)}\]
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Calcium carbonate (Limestone) decomposes to calcium oxide (quicklime) and cargon dioxide. Thermal Decomposition
\[\ce{CaCO3(s) ->[\Delta] CaO(s) + CO2(g)}\]
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Zinc displaces hydrogen from sulphuric acid to produce zinc sulphate. Displacement reaction
\[\ce{Zn + \text{dil.} H2SO4 -> ZnSO4 + H2}\]
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Zinc reacts with sodium hydroxide to form sodium zincate \(\ce{(Na2ZnO2)}\) and hydrogen gas. Displacement reaction.
\[\ce{\underset{(Zinc)}{Zn(s)} + \underset{(Sodium Hydroxide)}{2NaOH(aq)} -> \underset{(Sodium Zincate)}{2Na2ZnO2(aq)} + \underset{(Hydrogen)}{H2(g)}}\]
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Sodium sulphate and barium chloride exchange ions to form barium sulphate and sodium chloride. Double displacement reaction
\[\ce{\underset{(Sodium sulphate)}{Na2SO4(aq)} + \underset{(Barium chloride)}{BaCl2(aq)} -> \underset{(Barium sulphate)}{BaSO4(s)} + \underset{(Sodium chloride)}{2NaCl(aq)}}\]
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Zinc displaces hydrogen from hydrochloric acid to form zinc chloride. Displacement reaction
\[\ce{Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g)}\]
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Calcium oxide combines with carbon dioxide to form calcium carbonate. Combination reaction
\[\ce{CaO + CO2 -> CaCO3}\]
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Aluminium displaces iron from ferric oxide (Iron (III) oxide) to form aluminium oxide. Displacement reaction
\[\ce{2Al2(s) + Fe2O3(s) -> Al2O3(s) + 2Fe(s)}\]
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The combustion of methane produces carbon dioxide, water and large amounts of heat.
\[\ce{CH4 + 2O2 -> CO2 + 2H2O}\]
