Question

Some acids are dangerous and some are not? Why?

Answer 1

Acids like H2SO4, HCl and HNO3 are corrosive and can burn any living tissue. They corrode metals.
Some acids maybe harmful in concentrated form but are useful in their diluted form.
An example is acetic acid which can cause burns in concentrated form but is used in cooking and as a condiment in its diluted form, vinegar.
Citric acid is used as a preservative in foods and gives a sour and acidic taste to food.

Certain chemical properties make an acid dangerous......For e.g., sulphuric acid has the property of absorbing water. Thus when it spills on the body, it can cause severe burns. Nitric acid similarly is an oxidizing agent. It reacts violently with the skin, muscles and bones to cause lethal damage
damage.

Hope it helps