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Solution


Q.

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Enthalpy of neutralisation of strong mono basic acid with strong monoacidic base is always –57 kJ mol-1.

Reason (R): Enthalpy of neutralisation is the amount of heat liberated when one mole of H+ ions furnished by acid combine with one mole of OH- ions furnished by base to form one mole of water.

In the light of the above statements, choose the correct answer from the options given below.                             [2024]
1 (A) is true but (R) is false  
2 Both (A) and (R) are true and (R) is the correct explanation of (A)  
3 (A) is false but (R) is true  
4 Both (A) and (R) are true but (R) is not the correct explanation of (A)  

Ans.

(2)

When a monobasic strong acid reacts with a monoacidic strong base, then net reaction is combination of one mol H+ with one mole OH- to form one mole of water as shown below:

Since net reaction is always same irrespective of name of acid or base, amount of heat released is always same i.e. 57.1 kJ/mol.