An unknown anion in solution is to be identified by adding `Ag^(+)` and `Ba^(2+)` ions to separate portions of it. Which anion would produce the results listed for it ? (+ indicates the presence of a precipitate)

Options

A. `{:(,Ag.^(+),Ba^(2+)),("Carbonate",+,-):}`
B. `{:(,Ag.^(+),Ba^(2+)),("Hydroxide",-,+):}`
C. `{:(,Ag.^(+),Ba^(2+)),("Iodide",+,-):}`
D. `{:(,Ag.^(+),Ba^(2+)),("Sulphide",-,-):}`

Answer

C

Explanation

Insoluble: `Ag_(2)CO_(3),BaCO_(3),AgI, Ag_(2)S`
Soluble: `AgOH, Ba(OH)_(2),BaI_(2),BaS`