Under conditions of equal reduced pressure and equal reduced temperature, substa

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Home Aptitude

Question
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.
Options
A. compressibility
B. molecular weight
C. humidity
D. none of these

Correct Answer

compressibility

2. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are X_c and X_s respectively. Which of the following statement is correct?
Options
A. X_c > X_s
B. Xc = X_s .
C. X_c < X_s
D. X_c greater/less than X_s depending on the length of the cylinder

4. Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches
Options
A. ?
B. 0
C. 1
D. 0.24

5. 1 kg of calcium carbide (CaC₂) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?
Options
A. 5
B. 10
C. 15
D. 20

10. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ ? CO₂ + 2H₂O. Both the reactants and products are in gas phase. ?H�₂₉₈ = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about
Options
A. 0.19
B. 0.33
C. 0.40
D. 0.67

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