Question 5
the weak acid in the following list is
a)hydrochloric acid
b)sulfuric acid
c)nitric acid
d)acetic acid

The weak acid D) acetic acid.  

Acid are the substance which has pH below 7 and releases ions when they are treated with aqueous solution. Based upon the rate of dissociation, the acids are classified as strong acids which has high dissociation rate and weak acid with low dissociation rate.

Acetic acid is a organic acid with the formula . It is a colorless acid and also named as ethonoic acid.

Among the given list of acid in the option which includes, Sulfuric acid, Nitric acid, Hydrochloric acid, and Acetic acid, first three are strong acids, whereas the lastly mentioned is a weaker one.  

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

the answer is d p: cell, q: organ, r: organ system, s: tissue