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Match each mineral with its correct chemical formula from the following list: Magnetite, Carnallite, Epsom salt, Siderite
- Magnetite: Fe3O4; Carnallite: KCl*MgCl2*6H2O; Epsom salt: MgSO4*7H2O; Siderite: FeCO3
- Magnetite: Fe2O3; Carnallite: KCl*MgCl2*6H2O; Epsom salt: MgSO4*7H2O; Siderite: FeCO3
- Magnetite: Fe3O4; Carnallite: KCl*MgCl2*6H2O; Epsom salt: MgSO4*H2O; Siderite: FeCO3
- Magnetite: Fe3O4; Carnallite: KCl*MgCl2*6H2O; Epsom salt: MgSO4*7H2O; Siderite: Fe2CO3
Correct answer: Magnetite: Fe3O4; Carnallite: KCl*MgCl2*6H2O; Epsom salt: MgSO4*7H2O; Siderite: FeCO3
Solution
All four minerals in option A have their standard and correct chemical formulas. The distractors in other options change either the formula of magnetite (Fe2O3 is haematite), the hydration of Epsom salt (1H2O instead of 7), or the formula of siderite (Fe2CO3 does not exist).
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