Question

Which of the following reactions will yield products?​

• A. $\mathrm{Mg}\left(s\right)+{\mathrm{CaSO}}_4\left(\mathrm{aq}\right)\to$
• B. $\mathrm{Zn}\left(s\right)+{\mathrm{AuCl}}_4\left(\mathrm{aq}\right)\to$
• C. $\mathrm{Mg}\left(s\right)+\mathrm{KCl}\left(\mathrm{aq}\right)\to$
• D. All of these​

Answer 1

The correct option is B $\mathrm{Zn}\left(s\right)+{\mathrm{AuCl}}_4\left(\mathrm{aq}\right)\to$

Here, we have zinc and gold. Through the reactivity series, we know that gold is a less reactive metal than zinc.

So, zinc will replace gold and zinc chloride and gold are formed.