Which of the following ionic equations are correct?
1 X+ e- → X
2 X- e- → X
3 O2- + 2e- → O
4 O2- – e- → O2
5 2I- 2e- → I
6 Ca2+ + 2e- → Ca

Answer:

14) F

1 – If a positively charged ion gains an negatively charge electron, the total charge on the atom would be 0. Hence, this is correct.

2 – If a negatively charged ion loses a negatively charged electron, the total charge on the atom would be 0. Hence, this is correct.

3 – If an ion has charge (2-) and it gains two negatively charged electrons, the total charge would be (4-) and not 0. Hence, this is wrong.

4 – If an ion has charge (2-) and it loses one negatively charged electron, the total charge would be (1-) and not 0. Hence, this is wrong.

5 – If two ions which have charge (1-) lose two electrons, there products should be two atoms with charge (0). In this equation, the products should be 2I and not I.

6 – If an ion with charge (2+) gains two negatively charged electrons, the product would be an atom without any charge. Hence, this is correct.

The answer is F.