Assertion(A) : The value of enthalpy of neutralization of a weak acid by strong base is numerically less than `57.1 kJ`.
Reason(R ) : All `OH^(-)` ions of strong base are not completely neutralized by `H^(+)` ions obtained from acid.
A. Both `A`and `R` are true and `R` is the correct explantion of `A`
B. Both `A`and `R` are true and `R` is not a correct explantion of `A`
C. `A` is true but `R` is false
D. `A` is false but `R` is true
