A solution containing $ ext{Sn}^{2+}$ ions can reduce an acidified solution of $ ext{MnO}_4^-$ ions to form $ ext{Mn}^{2+}$ ions. In this process, the $ ext{Sn}^{2+}$ ions are oxidised into $ ext{Sn}^{4+}$ ions. How many moles of $ ext{Mn}^{2+}$ ions are produced when a solution made from $9.5\,\text{g}$ of $ ext{SnCl}_2$ ($M_r = 190$) is added to excess acidified $ ext{KMnO}_4$ solution?
- A$0.010$
- B$0.020$
- C$0.050$
- D$0.125$