BPSC (Balochistan Public Service Commission) · BPSC – Lecturer / Assistant Professor Biology
Osmotic Pressure and Reverse Osmosis
Solutions _ Colligative Properties
· Chemistry
24 MCQs
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1
At constant temperature the pressure of an ideal gas is doubled its density becomes_______________?
Correct Option
Option C
Explanation
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
2
One mole of an ideal gas at 546.5 K under 2 atm pressure has a volume of________________?
Correct Option
Option B
Explanation
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
3
What volume does 1.4g of carbon monoxide occupy at Standard Temperature and Pressure?
Correct Option
Option C
Explanation
At STP, 1 mole (28g) of CO occupies 22.4 dm3. The molar mass of CO is 28g. 1.4g of CO is 1.4/28 = 0.05 moles. Therefore, 0.05 moles occupy 0.05 * 22.4 = 1.12 dm3.
4
What's the most secure and dependable way to dry crystals?
Correct Option
Option D
Explanation
A vacuum desiccator uses controlled low pressure and a desiccant to gently and thoroughly remove moisture from crystals, preventing degradation or damage. It's a more precise and reliable method compared to others.
5
What is the mixture that forms Oobleck?
Correct Option
Option A
Explanation
Oobleck is a non-Newtonian fluid that exhibits unique properties when its mixture of cornstarch and water is altered. When pressure or stress is applied, it acts like a solid, but when pressure is removed, it behaves like a liquid.
6
Which partial pressure of oxygen in the lungs is incorrect?
Correct Option
Option B
Explanation
The partial pressure of oxygen in the lungs is typically around 100 mmHg or 40% of the atmospheric pressure, which is approximately 0.21 atm. Option 1 atm represents the total atmospheric pressure, not the partial pressure of oxygen.
7
Which of these properties is a state function?
Correct Option
Option C
Explanation
State functions are properties that only depend on the current state of a system, not the path taken to reach that state. Pressure, temperature, and enthalpy are all state functions.
8
What happens to the column of a manometer that faces the liquid?
Correct Option
Option D
Explanation
In a manometer, the column that faces the liquid is depressed due to the pressure exerted by the liquid, causing it to move downward.
9
What is the density ofargon gas at a temperature of 30°C and a pressure of 1.05 atm?
Correct Option
Option B
Explanation
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
10
What is the only nonmetal that exists in a liquid state at standard conditions?
Correct Option
Option A
Explanation
Bromine is a nonmetal that exhibits unique properties, existing as a reddish-brown liquid at standard temperature and pressure. This characteristic sets it apart from other nonmetals, which typically exist in solid or gaseous states at standard conditions.
11
What was the maintained pressure level in a gas discharge tube?
Correct Option
Option B
Explanation
The pressure in a gas discharge tube was kept at a very low level. Among the given options, 0.01 torr represents the lowest pressure, which is necessary for the discharge process to occur, allowing the gas to be ionized and conduct electricity.
12
Equal masses of methane and oxygen are mixed in an empty container at 250°C. What fraction of the total pressure is exerted by oxygen?
Correct Option
Option D
Explanation
The ratio of the fraction of the total pressure exerted by oxygen to the total pressure can be determined by the mole fraction of oxygen, which is the same as the mass ratio of oxygen to the total mass of the mixture, assuming the gases have equal masses and the same molar mass. Methane has a molar mass of 16 g/mol, while oxygen has a molar mass of 32 g/mol, so the mole fraction of oxygen is 1/3.
13
Pressure remain constant, at which temperature the volume of gas becomes twice of what it is at 0°C?
Correct Option
Option C
Explanation
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
14
The partial pressure exerted by the water vapours is called_______________?
Correct Option
Option B
Explanation
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
15
Vapour pressure of water at 100°C is___________________?
Correct Option
Option A
Explanation
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
16
Which gas has the largest mass within a 1 cubic decimeter volume at standard temperature and pressure?
Correct Option
Option A
Explanation
At STP, gases have the same molar volume. CS2 has the highest molar mass among the options, meaning a given volume will contain the most mass of CS2 compared to the others.
17
What is the environment in which a system is studied?
Correct Option
Option A
Explanation
The surrounding environment refers to the external conditions or factors that affect a system being studied, such as temperature, pressure, or other external influences.
18
Which of the following statements regarding the properties of solutions is incorrect?
Correct Option
Option B
Explanation
The addition of a solute to a solvent decreases the water potential (or chemical potential) of the solution compared to pure water. This is a fundamental colligative property. Therefore, stating that solute addition increases water potential is factually incorrect, as solutes always lower the potential of the solvent.
19
What happens to blood cells when they are placed in a KCl solution that has a higher osmotic pressure than the internal cell fluid?
Correct Option
Option B
Explanation
When blood cells are placed in a hypertonic solution (higher osmotic pressure), water molecules move out of the cells through the semipermeable membrane via osmosis to balance the concentration gradient. This loss of water causes the cells to lose volume and shrink, a process known as crenation.
20
Which process is effectively used to obtain pure water from seawater?
Correct Option
Option C
Explanation
Reverse osmosis is a water purification technology that uses a semi-permeable membrane to remove ions, molecules, and larger particles from drinking water. By applying pressure greater than the osmotic pressure, water molecules are forced through the membrane while salts and other impurities are left behind, making it the standard method for desalination.
