Which of the following reactions could be termed as calcination?

CaCO₃→ CaO + CO₂

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4FeS₂ + 11O₂→ 2Fe₂O₃ + 8SO₂

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2 Al(OH)₃→ Al₂O₃ + 3H₂O

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CuS + CuSO₄→ 2Cu + 2SO₂

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Solution

The correct options are
A
CaCO₃→ CaO + CO₂

C
2 Al(OH)₃→ Al₂O₃ + 3H₂O

Metal carbonate or the metal hydroxide is getting converted to metal oxide in the limited supply of air or oxygen. This makes the ore porous and hydrated salts lose their water of crystallization. Thus the following reactions could be termed as calcination.

$C a C O_{3}$ $\to$ CaO + $C O_{2}$

$2 A l (O H)_{3}$ $\to$ $A l_{2} O_{3}$ + $3 H_{2} O$

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Similar questions

C a C O_{3} \to C a O + C O_{2}

4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}

2 A l (O H)_{3} \to A l_{2} O_{3} + 3 H_{2} O

C u_{2} S + 2 C u O \to 4 C u + S O_{2}

H_{2} S O_{4}

(F e S_{2})

4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}

2 S O_{2} + O_{2} \to 2 S O_{3}

S O_{3} + H_{2} O \to H_{2} S O_{4}

{Fe}_{2} O_{3} + 2 Al \to {Al}_{2} O_{3} + 2 Fe

What type of reactions are represented by the following equations

(a) $C a O + C O_{2} ⟶ C a C O_{3}$

(b) $2 N a + 2 H_{2} O ⟶ 2 N a O H + H_{2}$

(d) $N H_{4} N O_{2} ⟶ N_{2} + 2 H_{2} O$

(e) $C u S O_{4} + 2 N a O H ⟶ C u (O H)_{2} + N a_{2} S O_{4}$

C u S O_{4}

C u S O_{4} + 4 K I \to C u_{2} I_{2} + I_{2} + K_{2} S O_{4}

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