Q7 / 160 · AP EAMCET 2019 (23 Apr Shift 1) · Chemistry
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) \(\mathrm{Cr}_2 \mathrm{O}_3(s)+2 \mathrm{Al}(s) \stackrel{\Delta}{\longrightarrow} \mathrm{Al}_2 \mathrm{O}_3(s)+2 \mathrm{Cr}(s)\)
- AA, B, C, D
- BB, C only
- CC, D only
- Correct answerDA, 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) \(2 \mathrm{Fe}(s)+3 \mathrm{H}_2 \mathrm{O}(l) \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_2 \mathrm{O}_3(s)+3 \mathrm{H}_2(g)\)
Hence, the correct answer is option: 'D'.