Question

Cl + KI ----- KCl + I. Balance this equation and which type of reaction is this?

Answer 1

This is a simple replacement reaction, and occurs because chlorine is below iiodine in group VIIA. 
It is also an oxidation, reduction reaction. 
2 KI(aq) + 2e --> I2(g) (oxid.) 
Cl2 (g) - 2e --> 2 Cl-(aq) (redn) 
2 KI (aq) + Cl2(g) --> 2 KCl(aq) + I2(g)

Answer 2

Cl + KI --------------> KCl + I

it is balanced

it is displacement reaction