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# How much heat is liberated when 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl ?

(a) 22.92 kJ
(b) 17.19 kJ
(c) 11.46 kJ
(d) 5.73 kJ

100 mL of 1 N NaOH will be exactly neutralised with 100 mL of 1 N HCl.
1000 mL of 1 N NaOH reacts with 1000 mL of HCl to give 57.3 kJ of heat.
$\therefore$ 100 mL of 1 N NaOH will react with 100 mL of 1 N HCl to give $\frac{57.3}{1000}\times 100$ = 5.73 kJ of heat