Answer the following questions: (i) (1) Which trivalent ion has maximum size in the Lanthanoid…

Answer the following questions: (i) (1) Which trivalent ion has maximum size in the Lanthanoid series i.e. Lanthanum ion ($\text{La}^{3+}$) to Lutetium ion ($\text{Lu}^{3+}$)? (at. no. of Lanthanum = 57 and Lutetium = 71) (2) Explain why $\text{Cu}^{2+}$ is paramagnetic but $\text{Cu}^+$ is diamagnetic. (at. no. of Cu = 29) (ii) When a coordination compound $\text{CoCl}_3 \cdot 6\text{NH}_3$ is mixed with $\text{AgNO}_3$, three moles of $\text{AgCl}$ are precipitated per mole of the compound. Write the structural formula and IUPAC name of the coordination compound. (iii) Calculate the boiling point of urea solution when $6\text{ g}$ of urea is dissolved in $200\text{ g}$ of water. ($K_b\text{ for water} = 0\cdot52\text{ K kg mol}^{-1}$, boiling point of pure water = $373\text{ K}$, mol. wt. of urea = $60$) (iv) Identify the compounds A, B, C and D in the given reaction: $\text{HC} \equiv \text{CH} \xrightarrow[\text{Hg}^{2+}/\text{H}_2\text{SO}_4]{\text{H}_2\text{O}} \text{A} \xrightarrow[\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4]{[\text{O}]} \text{B} \xrightarrow{\text{Ca(OH)}_2} \text{C} \xrightarrow[\text{dry distillation}]{\text{heat}} \text{D}$