IAT (IISER) 2024 | Thermodynamics Question 1 | Chemistry

Consider an exothermic reaction: $2 \mathrm{~A}(\mathrm{~s}) \rightarrow \mathrm{B}(\mathrm{s})+\mathrm{C}(\mathrm{g})+\mathrm{D}(\mathrm{g})$. The correct statement about the reaction is

Spontaneous only at very low temperatures

Spontaneous only at very high temperatures

Non-spontaneous at all temperatures

Spontaneous at all temperatures

IAT (IISER) 2023

MCQ (Single Correct Answer)

-1

Consider the following reaction: $\mathrm{CH}_4(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{g})+4 \mathrm{H}(\mathrm{g}) ; \Delta_a H^0=1665 \mathrm{kJmol}^{-} 1$ Which of the statements is FALSE?

$\Delta_a H^0$ is the mean bond enthalpy of a C-H bond.

All four $\mathrm{C}-\mathrm{H}$ bonds in $\mathrm{CH}_4$ are identical in bond length and energy.

The energy required to break individual $\mathrm{C}-\mathrm{H}$ bonds in successive steps is different.

Mean C-H bond enthalpies differ slightly from compound to compound

IAT (IISER) 2020

MCQ (Single Correct Answer)

-1

What is the correct relation between the heat capacity at constant volume $\left(C_v\right)$ and heat capacity at constant pressure $\left(C_p\right)$ for an ideal gas? ( $R=$ Universal gas constant)

$C_v+C_p=2 R$

$C_P-C_V=R$

$C_v-C_p=2 R$

$C_v+C_p=R$

IAT (IISER) Subjects