Question

Lime water + sulphuric acid$ \to $
A.Heat+Calcium sulphate
B.Water+Heat
C.Calcium sulphate+Water+Heat
D.None of the above

Answer 1

Hint: We must remember that a chemical reaction between an acid and a base is called a neutralization reaction. The ionic compound formed along with water in this reaction is called salt.
Let us take the reaction of nitric acid and calcium oxide as an example:
The product of the reaction between aqueous nitric acid and solid calcium oxide is calcium nitrate and water. The completed equation is,
$
  HN{O_{3(aq)}} + Ca{O_{\left( s \right)}}\xrightarrow{{}}Ca{\left( {N{O_3}} \right)_{2(aq)}} + {H_2}{O_{\left( l \right)}} \\
  Nitric\,\,\,\,\,\,\,\,\,\,Calcium\,\,\,\,\,\,\,\,\,Calcium\,\,\,\,\,\,\,\,\,\,\,\,Water \\
  acid\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,oxide\,\,\,\,\,\,\,\,\,\,\,\,\,\,nitrate \\
 $

 Complete step by step answer:
We know that Lime water/calcium hydroxide $Ca{\left( {OH} \right)_2}$ is a strong base and sulphuric acid $\left( {{H_2}S{O_4}} \right)$ is strong acid since they undergo full dissociation in solution.
The formation of salt and water takes place when acid and base reacts with each other, the acid gets neutralized by the base. We can call it a neutralization reaction, and heat is released. The formation of new bonds in the reaction takes place due to the release of heat.
Stronger the amount of acid and base, the more heat is liberated.
The reaction of calcium hydroxide and sulphuric acid forms the product calcium sulphate and water, with the liberation of heat. We can write the chemical reaction is,
$
  Ca{\left( {OH} \right)_2}\,\,\,\,\, + \,\,\,\,\,{H_2}S{O_4}\xrightarrow{{}}\,\,\,\,CaS{O_4} + 2{H_2}O + Heat \\
  Calcium\,\,\,\,\,\,\,\,\,\,\,\,\,\,Sulphuric\,\,\,\,\,\,\,\,\,\,\,Calcium\,\,\,\,Water \\
  hydroxide\,\,\,\,\,\,\,\,\,\,acid\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,sulphate \\
 $

Therefore, Option (C) is correct .
Note:
Note: We also know that reactions that release heat energy to the surroundings are called exothermic reactions. The formation of chemical bonds releases heat energy.
Exothermic reaction does not require heat to occur, as exothermic reaction involves the formation of chemical bonds, the heat energy is released into the surroundings.
Example: In the combination reaction of solid carbon and gaseous oxygen, formation of gaseous carbon dioxide takes place with the evolution of heat energy.
$C\left( s \right) + {O_2}\left( g \right)\xrightarrow{{}}C{O_2}\left( g \right) + 393\,kJ$