Find the number of reaction from the given reactions which can show calcination process-i CaCO3-MgCO3 CaO - MgO - CO2ii CuCO3-CuOH2 2CuO - H2O - CO2iii Al2O3-2H2O Al2O3 - 2H2Oiv 2Cu2S - 3O2 2Cu2O - 2SO2

Following three reactions can show calcination process.(i) CaCO_3.MgCO_3 CaO + MgO + CO_2 (ii) CuCO_3.Cu(OH)_2 nbsp; 2CuO + H_2O + CO_2 (iii) Al ...

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Calcination

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Question

Find the number of reaction from the given reactions which can show calcination process:
(i) $C a C O_{3} . M g C O_{3} Δ - \to C a O + M g O + C O_{2}$
(ii) $C u C O_{3} . C u (O H)_{2} Δ - \to 2 C u O + H_{2} O + C O_{2}$
(iii) $A l_{2} O_{3} .2 H_{2} O Δ - \to A l_{2} O_{3} + 2 H_{2} O$
(iv) $2 C u_{2} S + 3 O_{2} Δ - \to 2 C u_{2} O + 2 S O_{2}$

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S_{8} + 8 O_{2} Δ - \to 8 S O_{2} ↑

P_{4} + 5 O_{2} Δ - \to P_{4} O_{10} ↑

4 A s + 3 O_{2} Δ - \to 2 A s_{2} O_{3} ↑

2 Z n S + 3 O_{2} Δ - \to 2 Z n O + 2 S O_{2} ↑

Z n C O_{3} Δ - \to Z n O + C O_{2} ↑

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}

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?