Question

Which of the following is not present in 2nd group ?

• A. Cadmium ion
• B. Arsenic ion
• C. Copper ion
• D. Chromium ion

Answer 1

The correct option is D Chromium ion

Second analytical group of cations consist, $B{i}^{+3},C{d}^{2+},C{u}^{2+},A{s}^{3+},A{s}^{5+},S{b}^{+3},S{b}^{+5},S{n}^{+2},S{n}^{+4},H{g}^{+2}$ and $P{b}^{+2}$

Thus, $chromium$ ion is not included in $2^{nd}$ $group$, it is included in third analytical group of cation as $C{r}^{+3}.$