Answer:
The bases feel slippery which is a physical properties. 
Step-by-step explanation:
Bases are substance which has pH above 7 and releases 
 ion when treated with aqueous solution or water. They exhibit certain types of physical as well as chemical properties.
 ion when treated with aqueous solution or water. They exhibit certain types of physical as well as chemical properties.
Some of the physical properties are as follows: 
- They have a sour taste. 
- They have should be touched carefully. 
- They are good conductors of electricity. 
- It turns red litmus to blue. 
- It turns dreary phenolphthalein to pink.