Question

Which one of the following is a complex salt:
(a) Ca(OCI)CI
(B) Pb(OH)NO3
(C) K2 [HgI4]
(D) Ca[H2PO2]2​

Answer 1

Answer:

(B) Pb(OH)NO3

is the answer

Answer 2

Out of

(a) Ca(OCI)CI

(B) Pb(OH)NO3

(C) K2 [HgI4]

(D) Ca[H2PO2]2​

K2 [HgI4] is the complex salt

• A complex salt is one which often contains two different types of metal ions.

• From the options provided, only in Pb(OH)NO3, only one metal atom is present i.e Pb. Similarly in Ca(OCI)CI and Ca[H2PO2]2​ , the metal atom present is Ca only.

• Whereas in K2 [HgI4], two metal atoms are present - K and Hg.

• A complex salt dissociates into a simple ion and a complex ion (which doesnt dissociate further).

• When K2 [HgI4] dissociates, it dissociates into 2 K+ ions (simple) and     HgI4 2- ion (complex ion). This complex ion doesnt dissociate further.

So, K2 [HgI4] is the complex salt.