AIIMS 2019 Chemistry Reduction Potential MCQ Question
Assertion : Mg cannot be obtained by reduction of its metal oxide by aluminium. Reason : Mg is less electropositive than Al.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Magnesium ions (Mg²⁺) can indeed be reduced to magnesium metal (Mg) through electrochemical processes, despite magnesium's high electropositivity and low standard reduction potential (−2.37 V). This means that while it is thermodynamically unfavorable to reduce Mg²⁺ under standard conditions, it is still possible under specific circumstances, such as in molten salts or during electrolysis. Option (A) is incorrect because it implies a complete impossibility of reduction, whereas reduction can occur under the right conditions. Options (C) and (D) are not applicable as they do not provide relevant content.
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