E for F + 2e 2F is 2.8 V,E for F + e F is :(1) 2.8 V (2) 1.4 V (3) – 2.8 V (4) – 1.4 V

To find the value of E for F + e F, we can use the given information.

First, let's look at the equation E for F + 2e 2F = 2.8 V. This equation tells us that the potential difference between F and 2F is 2.8 V when F gains two electrons.

Now, we want to find the potential difference when F gains only one electron. We can use the concept of proportionality to solve this. Since the number of electrons gained is halved, we can expect the potential difference to be halved as well.

Therefore, the potential difference E for F + e F should be half of 2.8 V.

Calculating this, we get:

E for F + e F = 2.8 V / 2 = 1.4 V

So, the correct answer is option (2) 1.4 V.