Question 2 :
The enthalpies of the elements in their standard states are assumed to be

Question 8 :
The standard enthalpy of formation (DHf°) at 398 K for methane, CH₄(g) is 74.8 kJ mol^–1. The additional information required to determine the average energy for C – H bond formation would be.

Question 9 :
Which of the following statements is true? The entropy of the universe

Question 11 :
At constant pressure and temperature, the direction of any chemical reaction is one where, the decrease.

Question 14 :
For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, {tex} \Delta \mathrm { U } {/tex} and {tex} \mathrm { w } {/tex} corresponds to

Question 15 :
When a gas undergoes adiabatic expansion, it gets cooled due to

Question 19 :
A given mass of gas expands reversibly from the state {tex}A{/tex} to the state {tex}B{/tex} by three paths {tex}1 , 2{/tex} and {tex}3{/tex} as shown in the figure. If {tex}w_1 , w_ 2{/tex} and {tex}w_3{/tex} respectively be the work done by the gas along three paths then:<br> <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/NEET/5efadb7a2cb6ea3d580629d4' class="uploaded-image" />

Question 20 :
The exchange of heat energy during chemical reaction at constant temperature and pressure occurs in form of: