a. For which of the following reactions, `K_(p)` is equal to `K_(c)` ?
i. `H_(2)+I_(2)hArr2HI`
ii. `N_(2)+3H_(2)hArr2NH_(3)`
iii. `PCl_(5)hArrPCl_(3)+Cl_(2)`
b. For which of the following cases does the reaction go garthest to completion:
`K=1, K=10^(10), K=10^(-10)`?

Explanation

To solve the question step by step, we will address both parts: (a) determining when \( K_p \) is equal to \( K_c \) and (b) identifying which reaction goes farthest to completion based on the equilibrium constant \( K \).

### Part (a): For which of the following reactions is \( K_p \) equal to \( K_c \)?

1. **Understanding the relationship between \( K_p \) and \( K_c \)**:
The relationship between \( K_p \) and \( K_c \) is given by the formula:
\[
K_p = K_c \cdot R^{\Delta n} \cdot T^{\Delta n}
...