Answer the following questions: (i) (1) Why does the density of transition elements increase from…

Answer the following questions: (i) (1) Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29) (2) Why is zinc not regarded as a transition element? (at. no. Zn = 30) (ii) Identify the compounds A, B, C and D: $\text{CH}_3\text{CN} \xrightarrow{\text{H}_2\text{O}/\text{H}^+} \text{A} \xrightarrow{\text{NH}_3} \text{B} \xrightarrow{\text{heat}} \text{C} \xrightarrow{\text{Br}_2/\text{KOH}} \text{D}$ (iii) Calculate the osmotic pressure of a solution prepared by dissolving $0\cdot025\text{ g}$ of $\text{K}_2\text{SO}_4$ in $2\cdot0\text{ litres}$ of water at $25^\circ\text{C}$ assuming that $\text{K}_2\text{SO}_4$ is completely dissociated. (mol. wt. of $\text{K}_2\text{SO}_4 = 174\text{ g mol}^{-1}$) (iv) What type of isomerism is shown by the following coordination compounds: $[\text{PtCl}_2(\text{NH}_3)_4]\text{Br}_2$ and $[\text{PtBr}_2(\text{NH}_3)_4]\text{Cl}_2$ Write their IUPAC names.