Question

The reaction that differs from the rest of the reactions given is
(A) Formation of calcium oxide from limestone
(B) Formation of aluminium from aluminium oxide
(C) Formation of sodium carbonate from sodium hydrogen carbonate
(D) Formation of mercury from mercuric oxide

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Answer 1

Answer:

(B) Formation of aluminium from aluminium oxide

Explanation:

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Answer 2

Option (B) Formation of aluminium from aluminium oxide is different from the rest of the reaction as it is a redox reaction

Explanation:

(A) Formation of calcium oxide from limestone

$CaCO3 ------- CaO +CO2$

this is a decomposition reaction

(B) Formation of aluminium from aluminium oxide

$Al2O3 ------2Al + 3/2 O2$

This is a redox reaction

(C) Formation of sodium carbonate from sodium hydrogen carbonate

$2NaHCO3 ------ Na2CO3 + H2O + CO2$

this is a decomposition reaction

(D) Formation of mercury from mercuric oxide

$HgO ----- Hg + 1/2 O2$

this is a decomposition reaction

Option (B) Formation of aluminium from aluminium oxide is different from the rest of the reaction as it is a redox reaction