Heat of neuralisation is amount of heat evolved or absorbed when `1g-` equivalent of an acid reacts with `1g-` equivalent of a base in dilute solution . If weak acid or weak bae are neutralised, the heat released during neutralisation is somewhat lesser than `-13.7kcal` or `-57.27 kJ` . Het of neutralisation is also referred as heat of formation of water from `H^(+)` and `OH^(-)` ions `i.e., H^(+)+OH^(-) rarr H_(2)O, DeltaH=-13.7kcal. `
Which of the following statements are correct ?
`(1)` `DeltaH=DeltaU+DeltanRT`
`(2)` Heat changes measured by bomb calorimeter give change in heat enthalpy during the reaction.
`(3)` `DeltaH=DeltaU` for the reaction `:`
`C_((s))+O_(2(g))rarr CO_(2(g))`
`(4)` Heat of formation for `C_(6)H_(6)` can be directly measured.

Options

A. `2,3`
B. `1,4`
C. `1,2,3`
D. `1,3`

Answer

D

Explanation

Bomb calorimeter gives `DeltaU. C_(6)H_(6)` can not be formed by `C` and `H_(2)`