JEE AdvancedChemistryGaseous StateMCQ+3 / −1
Match gases under specified conditions listed in Column I with their properties/laws in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 4 matrix given in the ORS.
| Column I | Column II | ||
|---|---|---|---|
| (A) | hydrogen gas (P = 200 atm, T = 273 K) | (P) | Compressibility factor 1 |
| (B) | hydrogen gas (P 0, T = 273 K) | (Q) | attractive forces are dominant |
| (C) | CO (P = 1 atm, T = 273 K) | (R) | PV = nRT |
| (D) | real gas with very large molar volume | (S) |
- AA - (s); B - (r); C - (q); D - (p, s)
- BA - (p, s); B - (r, q); C - (p, q); D - (s)
- CA - (p); B - (r); C - (p, q); D - (s)
- DA - (p, s); B - (r); C - (p, q); D - (p, s)
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Correct answer: D
This is a matching question where we need to pair gases under specific conditions (Column I) with their corresponding properties or governing laws (Column II). Let's analyze each case step-by-step.
(A) Hydrogen gas (P = 200 atm, T = 273 K)
- Condition Analysis: This condition involves a real gas (Hydrogen, H₂) at a very high pressure (200 atm). At such high pressures, gas molecules are forced very close to each other.
- Effect on Intermolecular Forces: For H₂, which is a small molecule with weak van der Waals attractive forces (small 'a' value), the repulsive forces arising from the finite volume of the molecules (the 'b' term) become dominant at high pressures.
- Applicable Gas Law: The van der Waals equation is . At very high pressures, is much larger than the pressure correction term . So, we can neglect this term. The equation simplifies to: This matches with option (S) in Column II.
- Compressibility Factor (Z): The compressibility factor is defined as . From the simplified equation , we get , which rearranges to . Dividing by gives: Since P, b, R, and T are all positive quantities, . This matches with option (P) in Column II.
- Conclusion for (A): It matches with (P) and (S).
(B) Hydrogen gas (P ~ 0, T = 273 K)
- Condition Analysis: This condition describes a gas at a pressure approaching zero.
- Behavior of Gas: At very low pressures, the volume occupied by the gas is very large. The molecules are far apart, making intermolecular forces negligible. Also, the volume of the molecules themselves is negligible compared to the total volume of the container.
- Applicable Gas Law: Under these conditions, all real gases behave ideally. Therefore, they obey the ideal gas law: This matches with option (R) in Column II.
- Conclusion for (B): It matches with (R).
(C) CO₂ (P = 1 atm, T = 273 K)
- Condition Analysis: This is carbon dioxide gas at Standard Temperature and Pressure (STP).
- Behavior of Gas: CO₂ is a real gas with significant intermolecular attractive forces (a relatively large 'a' value). The temperature T = 273 K is below the Boyle temperature of CO₂. At moderate pressures and temperatures below the Boyle temperature, the effect of attractive forces dominates over repulsive forces.
- Effect of Dominant Attractive Forces: When attractive forces are dominant, the molecules are pulled closer together than in an ideal gas. This makes the gas more compressible, resulting in a compressibility factor . So, this condition corresponds to the property where attractive forces are dominant (Q).
- General Behavior of Real Gas: A real gas like CO₂ can exhibit different behaviors depending on the conditions. At moderate pressures (like 1 atm), (attractive forces dominate). However, at very high pressures, repulsive forces will dominate, and . The question likely intends to test the general properties of a typical real gas like CO₂, which can exhibit both and . Therefore, it can be associated with both (P) Compressibility factor Z > 1 (at high P) and (Q) attractive forces are dominant (at moderate P).
- Conclusion for (C): It matches with (P) and (Q).
(D) Real gas with very large molar volume
- Condition Analysis: A very large molar volume () is achieved at very low pressures or very high temperatures.
- Effect on van der Waals Equation: The van der Waals equation for one mole is . When is very large, the attractive force term becomes negligible compared to the pressure P.
- Applicable Gas Law: The equation simplifies to . For n moles, this becomes: This matches with option (S) in Column II. This approximation is particularly valid at high temperatures where the kinetic energy of molecules overcomes attractive forces.
- Compressibility Factor (Z): From , we derive the compressibility factor as we did for case (A): This implies that Z > 1 (P).
- Conclusion for (D): It matches with (P) and (S).
Summary of Matches
- (A) (P), (S)
- (B) (R)
- (C) (P), (Q)
- (D) (P), (S)
Comparing this with the given options, we find that option D matches our derived connections perfectly.
Option D: A - (p, s); B - (r); C - (p, q); D - (p, s)
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