Question

Which of the compounds i) silver iodide (agi) ii) potassium phosphate (k3po4) iii) iron(iii) hydroxide (fe(oh)3) is/are insoluble in water? consider 'slightly soluble' to be insoluble. 1. i and iii only 2. ii only 3. iii only 4. i and ii only 5. ii and iii only 6. i only 7. none is insoluble. 8. all are insoluble?

Answer 1

(i) AgI has low Ksp so it is insoluble in water (Yellow ppt.)
(ii) K₃PO₄ is soluble in water
(iii) Fe(OH)₃ has low Ksp so it is insoluble in water (Reddish brown ppt.)
So the correct answers are (i) and (iii)
The correct answer is 1- (i) and (iii) only