Question

Choose the correct statement out of the following:
1. Heat of the reaction depends upon the temperature at which it is carried out.
2. Heat of neutralization depends upon the temperature at which the experiment is carried out.
3. Experimentally, heat of combustion is \[\Delta E\]
A) 1 only
B) 2 only
C) 3 only
D) All are correct

Answer 1

Hint:We need to remember that enthalpy is derived from pressure, volume, and internal energy, all of which are state functions; enthalpy is also a state function. The molar heat of combustion tells us how much heat is released when one mole of substance is completely burnt.

Complete step-by-step solution:
We will look for explanation for each given points:
The Heat of Reaction (also known as Enthalpy of Reaction) is the change in the enthalpy of a chemical reaction that occurs at a constant pressure. We can look at this explanation like this if the temperature of reactants is high, then the reaction will proceed faster. Thus this statement is true.
On moving to the next statement: The heat (or enthalpy) of neutralization (\[\Delta H\]) is the heat evolved when an acid and a base react to form a salt plus water. Both the solution and calorimeter increase in temperature due to the absorbed heat and this increase can be measured with a thermometer. \[\Delta H\] is negative if heat is evolved and positive if heat is absorbed.
And the last statement is also correct as experimentally, \[\Delta E\] is heat of combustion.
Thus the correct option for this question is option D as all the given statements are correct.

Note:We have to know that heat of a reaction is a thermodynamic unit of measurement useful for calculating the amount of energy per mole either released or produced in a reaction and in heat of neutralization the heat (Q) given off by the neutralization reaction is absorbed by the reaction solution and the calorimeter.