SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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magnesium
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hydrogen
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fluorine
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oxygen
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Detailed explanation-1: -Due to the electrolysis of magnesium fluoride (MgF2), the magnesium fluoride is formed in the cathode, and fluorine is formed in the anode.
Detailed explanation-2: -Aqueous M g C l 2 gives Hydrogen gas at cathode and oxygen gas at anode.
Detailed explanation-3: -Because it is much easier to reduce water than Na+ ions, the only product formed at the cathode is hydrogen gas. There are also two substances that can be oxidized at the anode: Cl-ions and water molecules.
Detailed explanation-4: -Molten magnesium oxide, MgO contains magnesium ions, Mg2+ and oxide ions, O2– that move freely. The Mg2+ ions move to the cathode while the O2-ions move to the anode. At the cathode: Each Mg2+ ion is discharged by accepting two electrons to form a magnesium atom, Mg. Thus, magnesium metal is formed at the cathode.
Detailed explanation-5: -Sodium is obtained at the cathode during the electrolysis of molten sodium chloride.