question_answer

Which of the following statements is correct?

i.\[Ca{{(OH)}_{2}}\] and \[Mg{{(OH)}_{2}}\] are examples of diacidic base.

ii. A weak base produces high concentration of hydroxyl ions in solution.

iii. Alkalis change colourless phenolphthalein to pink.

iv. All bases decompose on heating to form their respective oxides.

v. Alkalis react with carbon dioxide to form carbonic acid.

A) i and iii

B) i, iii and iv

C)  ii, iv and v

D)  i, iii, iv and v

E)  None of these