Multiple choice Which of the following is not a physical property of bases? All bases are slippery to touch. Bases turn red litmus solution black. They have a bitter taste. Bases turn phenolphthalein solution pink. Bases like sodium hydroxide, potassium hydroxide are corrosive in nature. Reveal answer Fill a bubble to check yourself B Correct answer Explanation This is the correct option as bases do not turn red litmus solution black. They turn red litmus solution blue.