Iron II Sulphate

Q. Alum is added to muddy water to :

1. Kill all kinds of microorganisms
2. Impart different colours to the solution
3. To increase the Tyndal effect
4. Fasten the sedimentation rate

Q. Which series of reactions correctly represents chemical relations related to iron and its compound?

1. $Fe\stackrel{C{l}_2,heat}{\to }FeC{l}_3\stackrel{heat,air}{\to }FeC{l}_2\stackrel{Zn}{\to }Fe$
2. $Fe\stackrel{O_2,heat}{\to }F{e}_3{O}_4\stackrel{CO,{600}^{\circ }C}{\to }FeO\stackrel{CO,{700}^{\circ }C}{\to }Fe$
3. $Fe\stackrel{dil{H}_{2}S{O}_4}{\to }FeS{O}_4\stackrel{H_{2}S{O}_4,O_2}{\to }F{e}_2(S{O}_4{)}_3\stackrel{Heat}{\to }Fe$
4. $Fe\stackrel{O_2,heat}{\to }FeO\stackrel{dil,H_{2}S{O}_4}{\to }FeS{O}_4\stackrel{Heat}{\to }Fe$

Q. Potassium ferrocyanide is used for the detection of

1. $F{e}^{3+}$
2. $F{e}^{2+}$
3. $A{l}^{3+}$
4. $S{O}_4^{2-}$

Q. The aqueous solution of Iron (II) Sulphate is

1. Neutral
2. Amphoteric
3. Alkaline
4. Acidic

Q. During the finishing of steel, sheets of rods of steel are treated with pickling baths of Sulphuric acid. This is performed to remove the impurities (oxide layer, scales, etc.) on the surface of the steel but this process also produces a by-product in large quantities. Which of the following could be that by-product?

1. Iron (II) Oxide
2. Iron (II) Chloride
3. Iron (II) Sulphate
4. Metallic Iron is precipitated

Q. During the finishing of steel, sheets of rods of steel are treated with pickling baths of Sulphuric acid. This is performed to remove the impurities (oxide layer, scales, etc.) on the surface of the steel but this process also produces a by-product in large quantities. Which of the following could be that by-product?

1. Iron (II) Oxide
2. Iron (II) Chloride
3. Iron (II) Sulphate
4. Metallic Iron is precipitated