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Mock Test 1

  • Time yourself: 20 minutes
  • Do NOT check answers until finished
  • Then review explanations carefully

SECTION 1: MCQ

Question 1

Which species has the largest atomic radius?

  1. Na
  2. Mg
  3. Al
  4. Cl
Show answer

Correct answer: A

Why: Atomic radius increases down and to the left on the periodic table.

Fix it: Left + Down = bigger

Question 2

Which bond is most polar?

  1. C–H
  2. O–H
  3. N–H
  4. Cl–Cl
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Correct answer: B

Why: O–H has the greatest electronegativity difference.

Fix it: Bigger EN difference → more polar

Question 3

Which intermolecular force is strongest?

  1. London dispersion
  2. Dipole-dipole
  3. Hydrogen bonding
  4. Ion-dipole
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Correct answer: D

Why: Ion-dipole forces are stronger than hydrogen bonding.

Fix it: Ion > H-bond > dipole > LDF

Question 4

If temperature increases, reaction rate:

  1. decreases
  2. increases
  3. stays same
  4. stops
Show answer

Correct answer: B

Why: Higher temperature → more kinetic energy → more collisions.

Fix it: Hotter = faster

Question 5

Which is at equilibrium?

  1. reaction stops
  2. forward = reverse rate
  3. equal concentrations
  4. no movement
Show answer

Correct answer: B

Why: Equilibrium is dynamic, not static.

Fix it: Rates equal, not amounts

Question 6

pH of 1×10⁻³ M HCl is:

  1. 1
  2. 2
  3. 3
  4. 4
Show answer

Correct answer: C

Why: pH = -log(10⁻³) = 3

Fix it: Count exponent → pH

Question 7

Adding catalyst will:

  1. change K
  2. shift equilibrium
  3. speed reaction
  4. increase products
Show answer

Correct answer: C

Why: Catalysts only change rate.

Fix it: Catalyst ≠ shift

Question 8

Oxidation means:

  1. gain electrons
  2. lose electrons
  3. gain protons
  4. lose protons
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Correct answer: B

Why: Oxidation = loss of electrons.

Fix it: LEO says GER

Question 9

Which has strongest IMF?

  1. CH₄
  2. CO₂
  3. H₂O
  4. O₂
Show answer

Correct answer: C

Why: Hydrogen bonding in water.

Fix it: H–F, H–O, H–N = strong

Question 10

Diluting acid will:

  1. lower pH
  2. raise pH
  3. no change
  4. neutralize
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Correct answer: B

Why: [H⁺] decreases → pH increases.

Fix it: Dilution = weaker acid

SECTION 2: FRQ

FRQ 1

Explain how increasing pressure affects equilibrium when gases are involved.

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Key points

  • system shifts to fewer gas moles
  • reduces pressure
  • Le Châtelier principle

Sample answer: Increasing pressure causes the equilibrium to shift toward the side with fewer gas molecules to reduce pressure.

FRQ 2

Explain why increasing temperature increases reaction rate.

Show answer

Key points

  • particles move faster
  • more collisions
  • more effective collisions

Sample answer: Increasing temperature increases kinetic energy, leading to more frequent and effective collisions, which increases reaction rate.