Fresh milk has a pH of 6. On changing into curd, its pH becomes
7.
more than 6.
remains 6.
less than 6.
As milk turns into curd, its pH falls below 6 due to the formation of lactic acid.
The pH of a compound is found to be 9. The compound can be
The normal pH range for a healthy body is
Which of the following statements is correct about an aqueous solution of an acid and of a base ?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
When an acid is dissolved in water, the concentration of hydrogen ions per unit volume
