Question

Which forms an equal number of moles of ions, when one mole of it is dissolved in excess of water?

• A. Ferrous ammonium sulphate, Carnallite
• B. Carnallite, Alum
• C. Alum, Potassium ferrocyanide
• D. Potassium ferrocyanide, Potassium ferricyanide
  

Answer 1

The correct option is A Ferrous ammonium sulphate, Carnallite

Carnallite $KCl.MgC{l}_2.6H_{2}O$ 5 mole ion
Alum $K_{2}S{O}_{4}A{l}_2(S{O}_4{)}_3.24H_{2}O$ 8 mole ion
Ferrous ammonium sulphate $\left(N{H}_4{)}_{2}Fe\right(S{O}_4{)}_{2}6H_{2}O$ 5 mole ion
Potassium ferrocyanide $K_4\left[Fe\right(CN{)}_6]$ 5 mole ion
Potassiumferricyanide $K_3\left[Fe\right(CN{)}_6]$ 4 mole ion.