B.
$${K_4}\left[ {Fe{{\left( {CN} \right)}_6}} \right]$$
C.
hypo
D.
potash alum
Answer :
potash alum
Solution :
Double salts are additon or molecular compounds which are formed by two apparently saturated compounds but they lose their identity
when dissolved in water. The most common example of double salt is potash alum $${K_2}S{O_4} \cdot A{l_2}{\left( {S{O_4}} \right)_3} \cdot 24{H_2}O.$$
Releted MCQ Question on Inorganic Chemistry >> P - Block Elements
Releted Question 1
The reddish brown coloured gas formed when nitric oxide is oxidised by air is