Question

# Is burning of coal a combination reaction?

# Write down the chemical equation for burning of natural gas.

# Magnesium is burnt in air.
# Calcium carbonate is heated.​

Answer 1

Answer:

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Explanation:

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Answer 2

• Is burning of coal a chemical reaction?

$\bf{Answer:-}$ Yes, burning of coal is a chemical reaction.

$\bf{C(s)}$ $\bf{ +}$ O₂ (g) → CO₂ (g)

(carbon) (oxygen) (carbon dioxide)

• Write down the chemical equation for burning of natural gas.

$\bf{Answer:-}$ The chemical equation of burning of natural gas is—

$\bf{CH₄(g)}$ $\bf{+}$ $\bf{2O₂(g)}$ $\bf{→}$ $\bf{CO₂ (g)}$ $\bf{+}$$\bf{2H₂O (g)}$

• Magnesium is burnt in air.

$\bf{Answer:-}$ Magnesium does not react with air at room temperature. But when heated, it burns in air with a brilliant flame and produces magnesium oxide.

$\bf{2Mg (s) + O₂ (g) —heat—> 2MgO (s) }$

(Magnesium) (oxygen) (Magnesium oxide)

• Calcium carbonate is heated.

$\bf{Answer:-}$ When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

$\bf{CaCO₃ (s) —heat—> CaO (s) + CO₂ (g)}$

(calcium carbonate) (calcium oxide) (carbon dioxide)