Question

A chloride dissolves appreciably in cold water. When placed on a platinum wire in bunsen flame, no distinctive color is noticed. The cation may be:

• A. $M{g}^{2+}$
• B. $B{a}^{2+}$
• C. $N{a}^{+}$
• D. $C{a}^{2+}$

Answer 1

The correct option is A $M{g}^{2+}$

$M{g}^{2+}$ and $B{e}^{2+}$ ions do not impart any color to the flame because electrons in them are strongly bound and therefore, can not be excited by flame. Hence, they can not give any colour to the flame.
Therefore, option A is correct.