The correct option is B FeCl3
The salt X is ferric chloride FeCl3.
It reacts with SCN− to form blood red ferric thiocyanate.
FeCl3+3SCN−F→e(CNS)3+3Cl−
It also reacts with potassium ferrocyanide to form blue colored ferric ferrocyanide.
4FeCl3+3K4[Fe(CN)6]F→e4[Fe(CN)6]3+12KCl
Also, since, salt X contains chlorine, it gives positive chromyl chloride test.
4Cl−+K2Cr2O7+3H2SO4→K2SO4+2SO2−4+2CrO2Cl2↑+3H2O
In this test, orange yellow chromyl chloride gas is obtained.