In the previous post, we have discussed on a MCQ question on Electrolysis that requires students to:
1. Write out discharge half equations
2. Do Molar Ratio Comparisons
Question:
Which of the following requires the least number of eletrons for discharge?
A. 2 mol of Al3+ (aluminium) ions
B. 5 mole of OH- (hydroxides) ions
C. 3 mol of O2- (oxides) ions
D. 6 mol of H+ (hydrogen) ions
Write your Answer and Suggested Working in the “Leave A Reply” section below.
PS: If you are not sure how to proceed, you can refer to the previous blogpost by clicking HERE
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- O Level Chemistry: Challenging Mole Calculation / Electrolysis Questions
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- O Level Chemistry: Mole Calculations – Limiting & Excess Reactants
i tink it is b
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my ans is also b
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It’s B.
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see which one needds lowest no of mol of e-
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its b
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i think is d
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Correct answer is B.
A: require 6 electrons
B: require 5 electrons
C&D : require 6 electrons
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