1. Derive the net-ionic equation for the precipitation reaction that would occur when the solutions given below are combined. Show all the necessary steps. CO,(a)) Cr(SO,), (aq) + (NH,),CO (1) [5 marks] 2. A solution of unknown ionic compound was transferred into two beakers, and later, solutions of Sr(NO3)2 and Ba(NO3)2 were added to each of the beakers. It was noted that precipitates were formed in both beakers. Which of the following could be the anion of the unknown salt: Br or SO4? Show your reasoning. [4 marks] 3. Use the half-reaction method to balance the following redox reaction occurring in basic solution. Show all steps. i. CIO (aq) + Cr(OH), (aq) CrO2 (aq) + Cl(aq) [30 marks] ii. IPO4 iii. As 12 +1O3 HASO4 + AsH3 H2PO4 4. Write balanced nuclear equations for the following processes: a. Gold-188 decays by positron emission. [2 marks