Download App

STD 11 - 5. Thermodynamics and thermochemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 5. Thermodynamics and thermochemistry4 Marks
MCQ
An ideal gas undergoes isothermal expansion at constant pressure. During the process
  • A
    enthalpy increases but entropy decreases
  • ✓
    enthalpy remains constant but entropy increases
  • C
    enthalpy decreases but entropy increases.
  • D
    Both enthalpy and entropy remain constant.
✓

Answer

Correct option: B.
enthalpy remains constant but entropy increases
b
$\Delta H = n{c_p}\Delta T = 0$ means $\Delta H$ constant.

$\Delta S = nR\,\ln {\kern 1pt} \left( {\frac{{{v_f}}}{{{v_i}}}} \right) \geqslant 0$ $\Delta S$ increases.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Mendeleef's periodic law is based on
→
The oxidation state of $I$ in ${H_4}IO_6^ - $ is
→
The oxidation state of $I$ in $IP{O_4}$ is
→
Which of the following metals will not react with solution of $CuS{O_4}$
→
The amount of energy released on the addition of an electron in outermost shell of an  atom is called 
→
The number of water molecule $(s)$ not coordinated to copper ion directly in $CuSO_4.5H_2O,$ is
→
If $D_T$ and $D_0$ are the theoretical and observed vapour densities at a definite  temperature and $\alpha$ be the degree of dissociation of a substance. Then, $\alpha$ in  the terms of $D_0, D_T$ and $n$ (number of moles of product formed from $1 \,mole$ reactant) is calculated by the formula
→
The number of significant figures in $6.02 \times {10^{23}}$ is
→
Nitrogen gas is liberated by thermal decomposition of
→
In Kjeldahl’s method of estimation of $N$, $CuS{O_4}$ acts as
→