Question

(1) An insoluble salt formed by reaction between a metal and a nonmetal.
(2) A carbonate insoluble in water
(3) An insoluble salt formed from two soluble salt solutions one of which is sodium chloride solution
(4) A salt which decomposes on heating to give a metal as a residue
(5) A normal salt formed by reaction between an insoluble carbonate and dilute acid.

Answer 1

Hint: We know that salt is a compound formed by the reaction of an acid and a base. The reaction of an acid and base is termed a neutralization reaction. Salt and water is produced in the neutralization reaction.

Complete step by step solution:
(1) Here, a metal and non-metal react to form an insoluble salt. Zinc is a metal and sulphur is a non-metal. When both undergo reaction a salt namely ZnS (zinc sulphide) is formed. The reaction is,
${\rm{Zn}} + {\rm{S}} \to {\rm{ZnS}}$
The zinc sulphide is the salt that is insoluble in water.

(2) Most of the carbonates are insoluble in water except potassium, sodium and ammonium. So, sodium carbonate and ammonium carbonate are soluble in water. Zinc carbonate is insoluble in water.

(3) Here, we have to identify the salt formed from two soluble salt solutions. One salt solution is given as sodium chloride (NaCl). Silver carbonate $\left( {{\rm{AgN}}{{\rm{O}}_{\rm{3}}}} \right)$
is a soluble salt. When silver carbonate undergoes reaction with sodium chloride, silver chloride separates (insoluble salt).
So, the reaction is,
${\rm{AgN}}{{\rm{O}}_{\rm{3}}} + {\rm{NaCl}} \to {\rm{AgCl}} \downarrow + {\rm{NaN}}{{\rm{O}}_3}$

(4) Here, a salt which decomposes on heating to give a metal as a residue needs to be identified. Silver nitrate is the salt which decomposes on heating to give silver, nitrogen dioxide and oxygen. The reaction is,
$AgNO_{3}\overset{\Delta }{\rightarrow}Ag+O_{2}+NO_{2}$

(5)Here, a normal salt which is formed by reaction between an insoluble carbonate and dilute acid needs to be identified. An insoluble carbonate is magnesium carbonate \[\left( {{\rm{MgC}}{{\rm{O}}_{\rm{3}}}} \right)\]. The reaction of a magnesium carbonate with dilute sulphuric acid produces magnesium sulphate . The reaction is,
${\rm{MgC}}{{\rm{O}}_{\rm{3}}} + {{\rm{H}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\left( {{\rm{dilute}}} \right) \to {\rm{MgS}}{{\rm{O}}_{\rm{4}}} + {{\rm{H}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}$

Note: A salt is composed of a related number of cations and anions and therefore it is neutral in nature. Salts are formed by reaction of acid with metals, metal carbonates or alkali. Salts are classified as three types, namely, normal salt, acid salt and basic salt.