Sodium carbonate is a basic salt because it is a salt of:

Which of the following are present in a dilute aqueous solution of hydrochloric acid?

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

Calcium phosphate is present in tooth enamel. Its nature is:

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?