1.1. A student carried out a series of experiments to identify four different transition metal compounds. Table 1 shows the student’s results which include incorrect and incomplete observations.

Identify the transition metal ions in each compound and explain any corrections needed for the student’s observations.

Table 1

1.2. Write an equation, including state symbols, for the separate reactions between the aqueous transition metal complex of Compound C with the following reagents:

i) Ammonia

ii) Excess ammonia 

iii) Sodium carbonate solution  

1.3. Write an equation for the reaction between the aqueous transition metal complex of Compound B with sodium carbonate solution to produce the white precipitate observed.

1.4. Explain why compound A releases a gas when reacted with sodium carbonate solution.