At first tell me which one is odd one out and then why the others are similar?
55. 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

Dear Student,
Consider all the chemical equationsA) CaCO3heat CaO + CO2B) 2Al2O3 + 3C 4Al + 3CO2C) 2NaHCO3 Heat Na2CO3 + CO2 + H2OD) 2HgO heat 2Hg + O2Reaction D is different because this reaction does not liberate carbondioxide.

Regards,

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C is different
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c is odd
 
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