(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.

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Solution

(a) 2KClO₃(s) $\to_{{MnO}_{2}}^{∆}$ 2KCl (s) + 3O₂ (g) $↑$

(b) 2Mg (s) + CO₂(g) $\to$ 2MgO (s) + C (s)

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Q. Rewrite the following information in the form of a balanced chemical equation: Magnesium burns in carbon dioxide to form magnesium oxide and carbon

Q. Potassium chlorate

(K C l O_{3})

on heating gives potassium chloride and oxygen. Write a balanced for this reaction and indicate the evolution of gas.

Q. When potassium chlorate

(K C l O_{3})

is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. Represent this in the form of a balanced chemical equation.

Q. (a) What is a balanced chemical equation? Why should chemical equations be balanced?
(b) Aluminium burns in chlorine to form aluminium chloride (AlCl₃). Write a balanced chemical equation for this reaction.
(c) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a balanced chemical equation for this reaction.

Write the balanced chemical equations for the following reactions-

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.

(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide $({Cu}_{2} I_{2})$ , liberates iodine gas and also forms potassium sulphate.

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(a) 2KClO3 (s) → MnO2 ∆ 2KCl (s) + 3O2 (g)↑ (b) 2Mg (s) + CO2 (g) → 2MgO (s) + C (s)

(a) 2KClO₃(s) $\to_{{MnO}_{2}}^{∆}$ 2KCl (s) + 3O₂ (g) $↑$

(b) 2Mg (s) + CO₂(g) $\to$ 2MgO (s) + C (s)