Question

(a) Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.
(b) Rewrite the following information in the form of a balanced chemical equation
Magnesium burns in carbon dioxide to form magnesium oxide and carbon.

Answer 1

Answer:

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Answer 2

Explanation:

(a) Balanced chemical reaction:

$2 K C l O_{3(s)} \stackrel{\Delta\left(M n O_{2}\right)}{\longrightarrow} 2 K C l_{(s)}+3 O_{2(g)}$

• The Potassium chlorate in presence of heat undergoes decomposition to form potassium chloride and oxygen gas is evolved.
• This reaction takes place in the presence of manganese dioxide which is a catalyst. This is a decomposition reaction as single reactant is decomposed to give two products.

(b) Balanced chemical reaction:

$2 M g_{(s)}+C O_{2(g)} \rightarrow 2 M g O_{(s)}+C_{(s)}$

• Magnesium oxide is the major product formed in the above reaction. This a combustion (magnesium burns) and oxidation (oxide of magnesium is released) reaction.