Stoichiometry

41. A chemical process is said to occur under unsteady state, if the

1. Inventory changes do not take place
2. Ratio of streams entering/leaving are independent of time
3. Flow rates & composition both are time dependent
4. None of these

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42. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is

1. N₂O₄
2. N₂O₅
3. N₂O₃
4. None of these

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43. A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO₂, 0.05 gm mole of oxygen and 0.80 gm mole of N₂. What is its molecular weight?

1. 28.6
2. 30
3. 30.6
4. 32.6

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44. A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be

1. -136.5°C
2. - 136.5°K
3. -273°C
4. 0°K

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45. A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be

1. 0°C
2. 0°K
3. -136.5°C
4. -136.5°K

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46. A gas mixture contains 6 moles of H₂ and 2 moles of N₂. If the total pressure of the gaseous mixture is 4 kgf/cm²; then the partial pressure of N₂ in the mixture will be _________ kgf/cm².

1. 1
2. 2
3. 4
4. 8

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47. A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be _________ c.c.

1. 283
2. 566
3. 293
4. 141.5

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48. A gaseous mixture contains 14 kg of N2, 16 kg of O₂ and 17 kg of NH₃. The mole fraction of oxygen is

1. 0.16
2. 0.33
3. 0.66
4. 0.47

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49. A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal

1. Kinetic energy
2. Intermolecular forces of attraction
3. Potential energy
4. Total energy

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50. 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?

1. X_c > X_s
2. X_c = X_s
3. X_c < X_s
4. X_c greater/less than X_s depending on the length of the cylinder

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