Which of the following reactions results in a decrease in the coordination number of the transition metal ion and the formation of a tetrahedral complex?
The addition of excess concentrated ammonia to an aqueous solution of copper(II) sulfate.
The addition of excess concentrated hydrochloric acid to an aqueous solution of cobalt(II) sulfate.
The addition of excess sodium hydroxide solution to an aqueous solution of chromium(III) sulfate.
The addition of excess sodium ethanedioate solution to an aqueous solution of iron(III) sulfate.
63 exam-style questions on AQA A Level Chemistry Transition metals (A-level only), covering General properties of transition metals (A-level only), Substitution reactions (A-level only), Shapes of complex ions (A-level only), Formation of coloured ions (A-level only), Variable oxidation states (A-level only), and Catalysts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.