Question

The mixed salt among the following is:
A. $KOOCC{H_2} - C{H_2}COONa$
B. $NaKS{O_4}$
C. $CaOC{l_2}$
D. All the above

Answer 1

Salt is an ionic substance with a cation (base) and an anion (charge) (acid). It is the major mineral constituent of seawater and is found in great quantities there. One of the most well-known salts is sodium chloride. Because of its ubiquitous usage in everyday life, one salt is familiar to practically everyone.

Complete answer:
Mixed salt is a salt that is composed of a fixed mixture of two salts that often share a common cation or anion.
A mixed is one which furnishes two types of cations and anions.
$KOOCC{H_2} - C{H_2}COONa$ makes ${K^ + },N{a^ + }$ and $^ - OOCC{H_2}C{H_2}CO{O^ - }$ ions.
$KOOCC{H_2} - C{H_2}COONa \to {K^ + } + N{a^ + }{ + ^ - }OOCC{H_2}C{H_2}O{O^ - }$
$NaKS{O_4}$ makes $N{a^ + },{K^ + }$ and $SO_4^{ - 2}$ ions.
$NaKS{O_4} \to N{a^ + } + {K^ + } + SO_4^{ - 2}$
$CaOC{l_2}$ makes $C{a^{ + 2}}$ , $OC{l^{^ - }}$and $OC{l^ - }$ ions.
$CaOC{l_2} \to C{a^{ + 2}} + OC{l^ - } + C{l^ - }$
From above, we can conclude that all the given salts are mixed salts as they contain both cations and anions.
Hence, the correct option is D. All the above.

Additional information: Salts can further be classified as Acidic salts, Basic salts and double salts.
Acidic salts: An acidic salt is a salt formed by partial neutralisation of a diprotic or polyprotic acid.
Basic salts: A basic salt is a salt that is formed when a strong base is partially neutralised by a weak acid.
Double salts: Double salts are those that have more than one cation or anion in them.

Note:
Double salts differ from mixed-crystal systems, which occur when two salts crystallize; the former involves a chemical combination with a fixed composition, whereas the latter is a mixture. In general, the properties of the produced double salt will differ from those of its constituent single salts.