Physical Chemistry

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Q1. For which of the following molecules is the bond order equal to 0?

Solution:

He2 has a bond order of 0, as it has equal bonding and antibonding electrons.

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Q2. According to the kinetic molecular theory, which of the following statements is true?

Solution:

According to the kinetic molecular theory, gas particles are in constant motion.

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Q3. In a reaction where ΔH is negative and ΔS is positive, what can be said about ΔG?

Solution:

If ΔH is negative and ΔS is positive, ΔG will always be negative at all temperatures.

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Q4. Which of the following has an incomplete d-subshell?

Solution:

Chromium (Cr) has an electronic configuration of [Ar] 4s1 3d5, which means it has an incomplete d-subshell.

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Q5. Which of the following statements is true according to the first law of thermodynamics?

Solution:

The first law of thermodynamics states that energy can only be transformed from one form to another, not created or destroyed.

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Q6. What is the role of a catalyst in a redox reaction?

Solution:

A catalyst speeds up the reaction without being consumed in the process.

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Q7. Which of the following states of matter has the least amount of kinetic energy?

Solution:

Solids have the least amount of kinetic energy as their particles are closely packed and vibrate in fixed positions.

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Q8. Which of the following factors does NOT affect the equilibrium constant of a reaction?

Solution:

The equilibrium constant is only affected by temperature; changes in concentration or pressure do not affect it.

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Q9. Which of the following represents the correct relationship between moles, mass, and molar mass?

Solution:

The correct relationship is mass = moles × molar mass.

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Q10. What does a ΔG value of zero indicate about a reaction?

Solution:

A ΔG value of zero indicates that the reaction is at equilibrium, meaning the forward and reverse reactions occur at the same rate.