Which of a solution of sodium hydroxide is addeed in excess to the solution of potash alum, we obtain

Options

A. a white precipitate
B. bluish white precipitate
C. a clear solution
D. a crystalline mass

Answer

C

Explanation

Potash alum is `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` and so,
`Al_(2)(SO_(4))_(3)+6NaOHto 2Al(OH)_(3)darr ("white")+3Na_(2)SO_(4) , Al(OH)_(3)+OH^(-)to [Al(OH)_(4)]^(-)` (soluble complex)