Which of the following reactions occur during calcinations-i CaCO3 - CaO - CO2ii 4FeS2 - 11O2 - 2Fe2O3 - 8SO2iii 2AlOH3 - Al2O3 - 3H2Oiv Cu2S - 2CuO - 4Cu - SO2

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Calcination

Which of the ...

Question

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

(i) and (iii)

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(i) and (ii)

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(i) and (iv)

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(iii) and (iv)

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Solution

The correct option is A (i) and (iii)
Calcination is the process of heating the concentrated ore strongly in a limited supply of air or in the absence of air.

Among the given option (i) and (iii) represents calcination.

The carbonate ore gets decomposed to form the oxide of the metal.

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

The hydroxides will convert into their oxides.

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

Hence, the correct option is (A).

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Similar questions

Q. Make the correct match
A

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Which of the following are examples of combination reaction?

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

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

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Which of the following are examples of combination reactions?

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

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

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Q. How many kilograms of pure

H_{2} S O_{4}

could be obtained from 1 kg of iron pyrites

(F e S_{2})

according to the following reactions?

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}

Q. Identify the rate of reaction of given compounds in

E_{2}

reactions

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Which of the following reactions occur during calcinations?(i) CaCO3→CaO+CO2(ii) 4FeS2+11O2→2Fe2O3+8SO2(iii) 2Al(OH)3→Al2O3+3H2O(iv) Cu2S+2CuO→4Cu+SO2

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