### Class XI

1 mole of a monoatomic gas is mixed with 3 moles of a diatomic gas. What is the molecular specific heat of the mixture at constant volume?
1. 22.6 J / mol K
2. 12.5 J / mol K
3. 18.7 J / mol K
4. 15.2 J / mol K
Air in a thundercloud expands as it rises. If its initial temperature was 300 K, and if no energy is lost by thermal conduction on expansion, what is its temperature when the initial volume has doubled?γair=1.41
1. 247 K
2. 257 K
3. 237 K
4. 227 K
Two moles of an ideal gas (γ=1.4γ=1.4) expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. Find Q, W, and ΔEintΔEint.
1. 100 J, 4.88 kJ, -4.88 kJ
2. 1 J, 4.22 kJ, -4.22 kJ
3. 0, 4.66 kJ, -4.66 kJ
4. 10 J, 4.44 kJ, -4.44 kJ
According to Atomic Hypothesis: little particles of atom
1. repel each other when they are at small distance apart, but repel upon being squeezed into one another
2. repel each other when they are at large distance apart, but attract upon being separated from one another
3. attract each other when they are at small distance apart, but repel upon being squeezed into one another
4. repel each other when they are at small distance apart, but attract upon being squeezed into one another
Two moles of an ideal gas (γ=1.4γ=1.4) expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What are the initial and final temperatures?
1. 366 K, 253 K
2. 406 K, 273 K
3. 346 K, 243 K
4. 386 K, 263 K
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