A solution contains 0.05M of each of NaCl and Na_(2),CrO_(4),. Solid AgNO_(3), is gradually added to it. Whichof the following facts true (Given: K_(sp)(AgCl) = 1.7xx 106(-10) M^(2) and K_(sp)(Ag_(2),CrO_(4),) = 1.9 xx 10^(-12) M^(3):

A solution contains 0.05M of each of NaCl and Na_(2),CrO_(4),. Solid A

1.	A solution contains 0.05M of each of NaCl and Na_(2),CrO_(4),. Solid AgNO_(3), is gradually added to it. Whichof the following facts true (Given: K_(sp)(AgCl) = 1.7xx 106(-10) M^(2) and K_(sp)(Ag_(2),CrO_(4),) = 1.9 xx 10^(-12) M^(3):
Answer» `Cl^(-) ` ions are precipitated first `CrO_4^(2-)` ions are precipitated first Both `Cl^(-) and CrO_4^(2-)` ions are precipitated TOGETHER The second ion starts PRECIPITATING when ` [1^(st) ion ] =2.758 xx 10^(-5)` Solution :` (a) [Ag^(+) ] _(cl^(-)) = ( 1.7 xx 10^(_10) )/(5xx 10 ^(_2)) =3.4 xx 10 ^(_9) M` ` [Ag^(+) ]_(CrO_4^(_2) ) = sqrt( (1.9 xx 10^(-12))/(5 xx 10 ^(_2)))=6.1 xx 10 ^(_6) M` ` Cl^(_) `Starts precipitation first ` [Cl^(-)] =(K_(SP))/( [Ag^(+)]_(CrO_4^(_2)))= (1.7 xx 10 ^(-10))/(6.1 xx 10^(_6)) ` ` ""= 2.78 xx 10 ^(_5) M`