Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ is ________.

$$\mathrm{Cu}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{NH}_4^{+}, \mathrm{Mg}^{2+}, \mathrm{Zn}^{2+}$$

The number of white coloured salts, among the following is

(a) $\mathrm{SrSO}_4$

(b) $\mathrm{Mg}\left(\mathrm{NH}_4\right) \mathrm{PO}_4$

(c) $\mathrm{BaCrO}_4$

(d) $\mathrm{Mn}(\mathrm{OH})_2$

(e) $\mathrm{PbSO}_4$

(f) $\mathrm{PbCrO}_4$

(g) $\mathrm{AgBr}$

(h) $\mathrm{PbI}_2$

(i) $\mathrm{CaC}_2 \mathrm{O}_4$

(j) $\left[\mathrm{Fe}(\mathrm{OH})_2\left(\mathrm{CH}_3 \mathrm{COO}\right)\right]$

Number of metal ions characterized by flame test among the following is ________.

$$\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Co}^{2+}, \mathrm{Fe}^{2+}$$