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Question

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

$2 M g + C O_{2} \to 2 M g O + C$

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Q. (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.

Write the balanced chemical equation for the following and identify the type of reaction in each case.

(a)Potassium bromide _(a_q₎ + Barium iodide _(aq) → Potassium iodide _(aq) +

Barium bromide_(s)

(b) Zinc carbonate ₍_s₎ → Zinc oxide ₍_s₎ + Carbon dioxide ₍_g₎

(c) Hydrogen ₍_g₎+ Chlorine ₍_g₎ → Hydrogen chloride ₍_g₎

(d) Magnesium ₍_s₎+ Hydrochloric acid ₍_aq₎→ Magnesium chloride ₍_aq₎+ Hydrogen ₍_g₎

Q. (a) Define the following in terms of gain or loss of hydrogen with one example each:
(i) oxidation (ii) reduction
(b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

Q. Write chemical equations for the following equation and balance them.
Calcium oxide + carbon dioxide

\to

Calcium carbonate

Q. Balance the equation in which, calcium carbonate decomposes, on heating, to form calcium oxide and carbon dioxide

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