Consider the following table:
Class interval10−1414−1818−2222−2626−30Frequency511162519
The mode of the above data is
(a) 23.5 (b) 24 (c) 24.4 (d) 25
The heat of neutralization of a strong base and a strong acid is 57 kJ. The heat released, when 0.5 mole of HNO3 solution is added to 0.20 moles of NaOH solution, is: