How does pH play ann important role in everyday life?

Explanation

(a) The pH of blood is almost 7.4. Any increase or decrease in this value leads to diseases.
(b) Citrus fruits require slightly alkaline soil, while rice requires acidic soil and sugarcane requires neutral soil.
(c) If pH of rain water becomes less than 7, it becomes acid rain which is harmful in day-to-day life.
(d) pH changes cause tooth decay.
(e) During indigestion the stomach produces too much acid and this causes pain and irritation
(ii) (i) Propane is open chain or a cyclic compound because it contains an open chain.
`CH_(3)-CH_(3)-CH_(3)` [Propane]
(ii) Benzene is a carbocyclic compound because it contains carbon atoms cyclic ring of 6 atoms.

(iii) Cyclobutane is a carbocyclic compound.

(iv) Furan is a hetrocyclic compound because in the cyclic chain one atom is oxygen atom.