Q. 14
State the kind of chemical reactions in the following examples: (2014)
(i) Digestion of food in stomach
(ii) Combustion of coal in air
(iii) Heating of limestone
Answer :
(i) Digestion of food in stomach: During digestion, the complex food is broken into simpler form.
Therefore, it is a type of decomposition reaction.
(ii) Combustion of coal is air: During combustion the coal burns in air to form CO2, H2O along with the evolution of heat. Thus, it is a type of exothermic decomposition reaction.
(ii) Heating of limestone: When limestone is heated strongly, it breaks into CO2 and lime. Thus it is a type of thermal decomposition reaction.
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PREVIOUSSelect (i) combination reaction (ii) decomposition reaction and (iii) displacement reaction from the following chemical equations: (2014)(i) ZnCO3 (s) → ZnO (s) + CO2 (g)(ii) Pb (s) + CuCl2 (aq) → PbCl2 (aq) + Cu (s)(iii) NaBr (aq) + AgNO3 (aq) → AgBr (s) + NaNO3 (aq)(iv) H2 (g) + Cl2 (g) → 2 HCl (g)(v) Fe2O3 + 2Al → Al2O3 + 2Fe(vi) 3H2 (g) + N2 (g) → 2NH3 (g)(vii) CaCO3 (s) CaO (s) + CO2 (g)NEXTWrite the balanced chemical equation for the following reaction: (2014)(i) Phosphorus burns in chlorine to form phosphorus pentachloride.(ii) Burning of natural gas.(iii) The process of respiration.
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