Orange juice is a solution that contains citric acid, which gives orange juice an approximate ph of 3.5 minutes. which substance is more acidic than orange juice

Of the following given choices;

A. Battery acid with a pH of 0.8

B. Human saliva with a pH of 6.5

C. Baking soda solution with a pH of 8.0

D. Distilled water with a pH of 7.0

The answer is; A

This is because the pH of battery acid is lower than that of orange juice. The lower the pH, the higher its acidity. Properties of acids are that they have a sour taste to the tongue and are corrosive. A pH of above 7.0 means the substance  is basic.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.