Q27 of 152 Page 19

Potassium chlorate (KC103) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.

2KClO3 (s) 2KCl (s) + 302 (g)

Here oxygen will be released in the form of O2 gas.



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25 Write the balanced equations for the following reactions, and add the state symbols :

(a) Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.


(b) Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.

 26 Carbon monoxide reacts with hydrogen under certain conditions to form methanol (CH30H). Write a balanced chemical equation for this reaction indicating the physical states of reactants and product as well as the conditions under which this reaction takes place. 27 (b) Rewrite the following information in the form of a balanced chemical equation : Magnesium burns in carbon dioxide to form magnesium oxide and carbon. 28 Substitute formulae for names and balance the following equation :

Calcium carbonate reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide gas.