Q1. Which of the following statements is true regarding ideal gases? (2023)
Solution:
Ideal gases are considered to have no volume and no intermolecular forces.
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Q2. In a reaction, if the concentration of reactants is doubled, what happens to the rate of reaction if it is first order? (2023)
Solution:
For a first-order reaction, the rate is directly proportional to the concentration of the reactant, so doubling the concentration doubles the rate.
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Q3. If the vapor pressure of pure solvent is 100 mmHg, and the vapor pressure of the solution is 80 mmHg, what is the relative lowering of vapor pressure? (2022)
Q4. What is the standard temperature and pressure (STP) in Kelvin and atm? (2020)
Solution:
Standard temperature and pressure (STP) is defined as 273 K and 1 atm.
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Q5. Which of the following is an example of an endothermic process? (2021)
Solution:
Dissolving ammonium nitrate in water absorbs heat, making it an endothermic process.
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Q6. In a reaction, if the concentration of reactants is doubled, what happens to the rate of reaction if the reaction is first order? (2023)
Solution:
For a first-order reaction, the rate is directly proportional to the concentration of reactants, so doubling the concentration doubles the rate.
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Q7. What is the formula for calculating the number of moles from mass and molar mass? (2023)
Solution:
The correct formula is moles = mass / molar mass.
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Q8. If the vapor pressure of pure solvent is 100 mmHg, and the vapor pressure of the solution is 80 mmHg, what is the mole fraction of the solute? (2022)
