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this question is from edexcel chemistry unit 5 ial january 2015 mcq q-2

riamu

https://imgur.com/a/RnRHeHC

the correct answer is- D -but i cant get the balancing right ,please help

Reply 1

charco

Study Forum Helper

Original post by riamu

https://imgur.com/a/RnRHeHC

the correct answer is- D -but i cant get the balancing right ,please help

Balancing redox reactions is an art, but there are simple rules that take away the mystery.
In acidic conditions
1. Write out the half equations and balance them using only hydrogen ions, water and electrons
2. Multiply the half-equations by judicious numbers to equalize the electrons in each.
3. Add together and cancel out common terms.

In alkali conditions
1. Write out the half equations and balance them using only hydroxide ions, water and electrons
2. Multiply the half-equations by judicious numbers to equalize the electrons in each.
3. Add together and cancel out common terms.

Not much difference