Which of the following reactions are examples of calcination?

${CaCO}_{3} (s) \to CaO (s) + {CO}_{2} (g)$

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4 {FeS}_{2} (s) + 11 O_{2} (g) \to 2 {Fe}_{2} O_{3} (s) + 8 {SO}_{2} (g)

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$2 Al {(OH)}_{3} (s) \to {Al}_{2} O_{3} (s) + 3 H_{2} O (g) ()$

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$CuS (s) + {CuSO}_{4} (aq) \to 2 Cu (s) + 2 {SO}_{2} (g) ()$

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Solution

The correct options are
A
${CaCO}_{3} (s) \to CaO (s) + {CO}_{2} (g)$

C
$2 Al {(OH)}_{3} (s) \to {Al}_{2} O_{3} (s) + 3 H_{2} O (g) ()$

Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It involves the thermal decomposition of the ores. This process is mainly used for carbonate and hydroxide ores.
Examples of reaction undergoing calcination among the given are:

${CaCO}_{3} (s) \to CaO (s) + {CO}_{2} (g)$

$2 Al {(OH)}_{3} (s) \to {Al}_{2} O_{3} (s) + 3 H_{2} O (g)$

Suggest Corrections

Similar questions

Q. Which of the following reactions occur during calcinations?

(i)

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

(ii)

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

(iii)

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

(iv)

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

Q. Question 2

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

The above reaction is an example of a:

Q. Which of the following reactions will have a negative value of

△ S

2 Z n S (s) + 3 O_{2} (g) h e a t - - \to 2 Z n O (s) + 2 S O_{2} (g)

is an example of which type of reaction?

Which of the following reactions will not occur ? Why not?
(a) $M g S O_{4} (a q) + C u (s) ⟶ C u S O_{4} (a q) + M g (s)$
(b) $C u S O_{4} (a q) + F e (s) ⟶ F e S O_{4} (a q) + C u (s)$
(c) $M g S O_{4} (a q) + F e (s) ⟶ F e S O_{4} (a q) + M g (s)$

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