What is needed to balance the reaction Cl2 + KI KCl + I2?A.2KClB.2KI and 2KClC.2Cl2 and 2I2D.2KI

To balance the chemical equation Cl2 + KI -> KCl + I2, you need to ensure that there is an equal number of each type of atom on both sides of the equation.

Step 1: Identify the number of atoms for each element on both sides of the equation.

On the left side (Reactants), we have:

• 2 Cl atoms (from Cl2)
• 1 K atom (from KI)
• 1 I atom (from KI)

On the right side (Products), we have:

• 1 Cl atom (from KCl)
• 1 K atom (from KCl)
• 2 I atoms (from I2)

Step 2: Balance the equation.

We can see that Cl and I are not balanced. To balance Cl, we can add another KCl on the product side. Now, we have 2 Cl on both sides.

The equation becomes: Cl2 + KI -> 2KCl + I2

However, I is still not balanced. To balance I, we can add another KI on the reactant side. Now, we have 2 I on both sides.

The final balanced equation is: Cl2 + 2KI -> 2KCl + I2

So, the correct answer is B. 2KI and 2KCl.