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Calcination

Which of the ...

Question

Which of the following reactions occur during calcination?

A

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

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B

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

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C

A l_{2} O_{3} . x H_{2} O \to A l_{2} O_{3} + x H_{2} O

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D

Z n S + \frac{3}{2} O_{2} \to Z n O + S O_{2}

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Solution

The correct options are
A $C a C O_{3} \to C a O + C O_{2}$
C $A l_{2} O_{3} . x H_{2} O \to A l_{2} O_{3} + x H_{2} O$
In calcination the ore is heated below its melting point in the absence of air or limited supply of air. Oxygen containing ores like oxides, hydroxide and carbonates are calcined. Therefore, following reactions occur during calcination.

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

$A l_{2} O_{3} . x H_{2} O \to A l_{2} O_{3} + x H_{2} O$

Hence, the correct options are (A) and (C).

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Similar questions

Classify the following oxides into three types and name the types.

CaO, MgO, CO₂ , SO₃, Na₂O, ZnO, Al₂O₃ , Fe₂O₃

Q. Which of the following reactions occur during calcinations?

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}

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A l_{2} O_{3} . x H_{2} O

A l_{2} O_{3} . x H_{2} O

O H^{-} (a q)

A l_{2} O_{3} . x H_{2} O

H_{2} O (l)

A l_{2} O_{3} . x H_{2} O

H^{+} (a q)

A l_{2} O_{3} . x H_{2} O

N H_{3} (a q)

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F e_{2} O_{3}

Zn is the oxidant in the following reaction

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