A solution contains ` Cl^( - ) , I^( - ) and SO _ 4^( 3- ) ` ions in it. Which of the following ion is capable to precipitate all of the above when added in this solution ?

Options

A. ` Pb ^( 2 + ) `
B. `Ba^( 2 + ) `
C. `Hg^( 2+ ) `
D. `Cu^( 2 + ) `

Answer

B

Explanation

` Ba^ ( 2+ ) ` ion is capable to precipitate
` -Cl, -I and -SO _ ( 4 ) ^ ( 2 - ) ` ions.
` B a^ ( 2 + ) + 2 Cl ^( - ) to BaCl _ 2 downarrow `
` Ba^( 2 + ) + 2I ^( -) to BaI _ 2 downarrow `
` Ba ^( 2 + ) + SO _ (4) ^( 2 - ) to BaSO _ 4 downarrow `