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Q29 (CISF/2020) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Manganese is extracted from Manganese dioxide by reaction with Aluminium as described by the following unbalanced chemical equation :

MnO2 (s) + Al (s) → Mn (Z) + Al2Og (s)

The number of moles of Al (s) required to form one mole of Mn from its oxide is

Result
Your answer: —  ·  Correct: C

Explanation

To determine the number of moles of Aluminium (Al) required, we must first balance the chemical equation for the reduction of manganese dioxide. The standard balanced equation for this thermite reaction is:

3MnO2 (s) + 4Al (s) → 3Mn (l) + 2Al2O3 (s)

According to the stoichiometry of the balanced equation, 4 moles of Al are required to produce 3 moles of Mn. To find the amount of Al needed for 1 mole of Mn, we calculate the ratio:

Moles of Al = 4⁄3 ≈ 1.33

Thus, 1.33 moles of Al are required to form one mole of Mn. Option C is the correct answer.

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