Question

Consider the following cases:
(a) CaSO4 + Al →
(b) CuSO4 + Ca →
(c) FeSO4 + Cu →
(d) ZnSO4 + Mg →
The cases in which new products will form are –

• A. (a) and (b)
• B. (b) and (c)
• C. (c) and (d)
• D. (b) and (d)

Answer 1

Answer: (D)

(b) and (d)

Answer 2

- (b) CuSO$_4$ + Ca: Calcium displaces copper because calcium is more reactive than copper.
$\text{Ca + CuSO}_4 \, \rightarrow \, \text{CaSO}_4 \, + \, \text{Cu}.$
- (d) ZnSO$_4$ + Mg: Magnesium does not displace zinc because magnesium is less reactive.
New products form in cases (b) and (d).