Fe2+
MnO-4
H+
Fe3+
Correct answer is B
No explanation has been provided for this answer.
3
4
5
6
Correct answer is D
2AL(s) + 6H +(aq) → 2AL3+(aq) + 3H2(g). One aluminium atom transfers 3 electrons :. Two aluminium atoms will transfer 2x3=6 electrons
Metals can be extracted from their ores by a process involving
reduction
oxidation
hydrolysis
decomposition
Correct answer is A
No explanation has been provided for this answer.
The oxidation number of iodine in the iodate ion (IO -3) is
-5
-1
+1
+5
Correct answer is D
1O3
[oxidation number of 1] + [oxidation number of 0] x 3 = -1
x + -2 x 3 = 1
x - 6 = - 1
x = - 1 + 6 = +5
Electrolysis is applied in the following processes except
electroplating
extraction of aluminium
extraction of iron
purification of copper
Correct answer is C
No explanation has been provided for this answer.