Question

Addition of solution of oxalate to an aqueous. solution of mixture of $B{a}^{2+}$, $S{r}^{2+}$, and $C{a}^{2+}$ will precipitate :

• A. $C{a}^{2+}$
• B. $C{a}^{2+}$ and $S{r}^{2+}$
• C. $B{a}^{2+}$ and $S{r}^{2+}$
• D. All the three

Answer 1

The correct option is D All the three

Option (D) is correct.
Addition of solution of oxalate to an aqueous. solution of mixture of $B{a}^{2+}$, $S{r}^{2+}$, and $C{a}^{2+}$ will precipitate all of them.
Oxalate of these metals are insoluble.
Solution of the fifth group precipitate in acetic acid gives a white precipitatewith ammonium oxalate solution.
For ex : $CaC{O}_3+2C{H}_{3}COOH⟶(C{H}_{3}COO{)}_{2}Ca+H_{2}O+C{O}_2$
$(C{H}_{3}COO{)}_{2}Ca+(N{H}_4{)}_2{C}_2{O}_4⟶(COO{)}_{2}Ca+2C{H}_{3}COON{H}_4$