Imagine you are a chemist working in a laboratory that specializes in analysing and identifying chemical compounds. One day, a colleague asks for your help to determine the cations and anions present in several compounds they are working with. Analyse the following compounds and identify the cations and anions present (if any): (a) KBr (b) CaCO₃ (c) O₂ (d) MgSO₄

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