Q13 of 39 Page 1

Select (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)


(i) Decomposition reaction

(ii) Displacement reaction


(iii) Double displacement reaction


(iv) Combination reaction


(v) Displacement reaction


(vi) Combination reaction


(vii) Decomposition reaction


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Solid calcium oxide was taken in a container and water was added slowly to it.

(i) State two observations made in the experiment.


(ii) Write the balanced chemical equation of this reaction. (2013)


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Mention the rules for writing a chemical equation illustrating with the help of example. (2013)

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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


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Write the balanced chemical equation for the following reaction: (2014)

(i) Phosphorus burns in chlorine to form phosphorus pentachloride.


(ii) Burning of natural gas.


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