Law Of Chemical Equilibrium And Equilibrium Constant

We are given the following two reactions with their equilibrium constants:
1. , with 2. , with
We need to determine the equilibrium constant for the reaction: Step 1: Manipulate the given reactions
The first reaction is with . - Dividing this reaction by 2 gives: The equilibrium constant for this modified reaction will be , so:
The second reaction is with .
Dividing this reaction by 2 gives: The equilibrium constant for this modified reaction will be , so: Step 2: Combine the reactions Now, to get the desired reaction , we combine the reactions: - The first modified reaction: with
The second modified reaction: with The equilibrium constant for the overall reaction is the product of the individual equilibrium constants:

The correct option is (E) :

The equilibrium constant indicates the tendency of a reaction to proceed in the forward direction. A very large value of indicates that the reaction proceeds almost completely in the forward direction, while a very small value of indicates that the reaction proceeds very rarely in the forward direction.

Given the equilibrium constants for the reactions:

(A) at 500K: This is a very large value, so the reaction proceeds easily.
(B) at 700K: This is a moderate value, indicating a reaction that proceeds but not extensively.
(C) at 300K: This is also a large value, indicating the reaction proceeds with a high degree.
(D) at 298K: This is a very small value, indicating the reaction proceeds very rarely.
(E) at 300K: This is a large value, indicating the reaction proceeds easily.

Since option (D) has the smallest equilibrium constant, it represents the reaction that proceeds rarely at the given temperature.

The correct option is (D) : N₂(g) + O₂(g) ⇌ 2N0(g); K_c = 4.8×10³¹ at 298K

Potassium iodide

To prevent or control hypothyroidism, iodine is commonly added to table salt in a process known as iodization. The form of iodine most commonly used for this purpose is Potassium iodide (KI).

Hypothyroidism is a condition that arises when the thyroid gland does not produce enough thyroid hormones, and one of the causes is iodine deficiency. Adding iodine to salt helps ensure adequate iodine intake, which is necessary for the production of thyroid hormones.

Thus, the correct answer is Potassium iodide.

Step 1: The relation between and is given by: where is the change in the number of moles of gaseous products and reactants.
Step 2: From the reaction: Step 3: Given values: Step 4: Calculating : Step 5: Therefore, the correct answer is (D).