Statement I: | Total enthalpy change of a multistep process is the sum of ∆H1 + ∆H2 + ∆H3 + . . . |
Statement II: | When heat is absorbed by the system, the sign of q is taken to be negative. |
1. | Statement I is correct; Statement II is correct. |
2. | Statement I is correct; Statement II is incorrect. |
3. | Statement I is incorrect; Statement II is correct. |
4. | Statement I is incorrect; Statement II is incorrect. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0ºC. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be-
(R = 8.314 J/mol K) (ln 7.5 = 2.01)
1. | q = +208 J, w = -208 J | 2. | q = -208 J, w = -208 J |
3. | q = -208 J, w = + 208 J | 4. | q = +208 J, w = + 208 J |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology701 J of heat is absorbed by a system and 394 J of work is done by the system. The change in internal energy for the process is:
1. | 307 J | 2. | -307 J |
3. | 1095 J | 4. | -701 J |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | Work done in an irreversible isothermal process at constant volume is zero. |
Reason (R): | Work is assigned a negative sign during expansion and is assigned a positive sign during compression. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn ideal gas expands isothermally from at 300 K against a constant pressure of . The work done by the gas is:
1. | +270 kJ | 2. | –900 J |
3. | +900 kJ | 4. | –900 kJ |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 liters to 20 liters at 25°C is -
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe pressure-volume work for an ideal gas can be calculated by using the expression .
The work can also be calculated from the pV-plot by using the area under the curve within the specified limits.
An ideal gas is compressed (a) reversibly or (b) irreversibly from volume to .
The correct option is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor the graph given below, it can be concluded that work done during the process shown will be-
1. | Zero | 2. | Negative |
3. | Positive | 4. | Cannot be determined |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is correct for isothermal expansion of an ideal gas:
1. Wrev = Wirr
2. Wrev + Wirr = 0
3. Wrev > Wirr
4. qrev = qirr
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTo calculate the amount of work done in joules during reversible isothermal expansion of an ideal gas, the volume must be expressed in:
1. | m3 only | 2. | dm3 only |
3. | cm3 only | 4. | All of the above |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology