Which of the following are non-metal displacement reactions? (A) \(\mathrm{Ca}(s)+2 \mathrm{H}_2…

Which of the following are non-metal displacement reactions? (A) \(\mathrm{Ca}(s)+2 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_2(a q)+\mathrm{H}_2(g)\) (B) \(\mathrm{V}_2 \mathrm{O}_5(s)+5 \mathrm{Ca}(s) \stackrel{\Delta}{\longrightarrow} 2 \mathrm{~V}(s)+5 \mathrm{CaO}(s)\) (C) \(2 \mathrm{Fe}(s)+3 \mathrm{H}_2 \mathrm{O}(l) \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_2 \mathrm{O}_3(s)+3 \mathrm{H}_2(g)\) (D) \(\mathrm{Cr}_2 \mathrm{O}_3(s)+2 \mathrm{Al}(s) \stackrel{\Delta}{\longrightarrow} \mathrm{Al}_2 \mathrm{O}_3(s)+2 \mathrm{Cr}(s)\)
  1. A, B, C, D
  2. B, C only
  3. C, D only
  4. A, C only

Solution

Reactions given in options (A) and (C) are hydrolysis reaction and not metal displacement reactions as in these cases there is only one metal present in the reaction. \((\mathrm{A}) \mathrm{Ca}(s)+2 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_2(a q)+\mathrm{H}_2(g)\) (C) \(2 \mathrm{Fe}(s)+3 \mathrm{H}_2 \mathrm{O}(l) \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_2 \mathrm{O}_3(s)+3 \mathrm{H}_2(g)\)

Asked in: AP EAMCET 2019 (23 Apr Shift 1)

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