MCQ
The long form of periodic table has
- AEight horizontal rows and seven vertical columns
- ✓Seven horizontal rows and eighteen vertical columns
- CSeven horizontal rows and seven vertical columns
- DEight horizontal rows and eight vertical columns
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| Time | T | $\infty$ |
| $\mathbf{P}_{\text {system }}$ | $\mathrm{P}_{\mathrm{t}}$ | $\mathrm{P}_{\infty}$ |
Which of the following contains $(2C -1e^-)$ bond
[$A$] The work done on the gas is maximum when it is compressed irreversibly from ( $\mathrm{p}_2, \mathrm{~V}_2$ ) to ( $\mathrm{p}_1, \mathrm{~V}_1$ ) against constant pressure $\mathrm{pl}_1$
[$B$] The work done by the gas is less when it is expanded reversibly from $V_1$ to $V_2$ under adiabatic conditions as compared to that when expanded reversibly from $V_1$ to $V_2$ under isothermal conditions
[$C$] The change in internal energy of the gas is ($i$) zero, if it is expanded reversibly with $T_1=T_2$, and ($ii$) positive, if it is expanded reversibly under adiabatic conditions with $T_1 \neq T_2$
[$D$] If the expansion is carried out freely, it is simultaneously both isothermal as well as adiabatic