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Mock Test 3 (High-Yield)

  • Time yourself: 35 minutes
  • No checking answers until finished
  • Focus on reasoning, not memorization

SECTION 1: MCQ

Question 1

Which has the smallest atomic radius?

  1. Na
  2. Mg
  3. Al
  4. Cl
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Correct answer: D

Why: Atomic radius decreases left → right.

Fix it: Right = smaller

Question 2

Which has strongest Coulombic attraction?

  1. Na⁺
  2. Mg²⁺
  3. Al³⁺
  4. K⁺
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Correct answer: C

Why: Higher charge = stronger attraction.

Fix it: More charge = stronger

Question 3

Which molecule is nonpolar?

  1. H₂O
  2. NH₃
  3. CO₂
  4. SO₂
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Correct answer: C

Why: Linear symmetry cancels dipoles.

Fix it: Symmetry = nonpolar

Question 4

Which IMF is present in all molecules?

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

Why: All molecules have dispersion forces.

Fix it: Always LDF

Question 5

Increasing temperature will:

  1. decrease rate
  2. increase rate
  3. stop reaction
  4. no change
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Correct answer: B

Question 6

Which process releases heat?

  1. melting
  2. evaporation
  3. condensation
  4. sublimation
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Correct answer: C

Question 7

For exothermic reaction, increasing temperature shifts:

  1. right
  2. left
  3. no change
  4. depends
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Correct answer: B

Why: Heat is product → adding heat shifts left

Question 8

If Q > K:

  1. shift right
  2. shift left
  3. no change
  4. stop
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Correct answer: B

Question 9

Catalyst affects:

  1. K
  2. equilibrium position
  3. rate
  4. concentration
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Correct answer: C

Question 10

pH of 1×10⁻² M acid:

  1. 1
  2. 2
  3. 3
  4. 4
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Correct answer: B

Question 11

Which is conjugate acid of NH₃?

  1. NH₂⁻
  2. NH₄⁺
  3. H⁺
  4. OH⁻
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Correct answer: B

Question 12

Which increases solubility?

  1. decrease temperature
  2. increase pressure (gas)
  3. decrease pressure
  4. no change
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Correct answer: B

Question 13

Oxidation =

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

Question 14

Which is strongest oxidizing agent?

  1. loses electrons easily
  2. gains electrons easily
  3. neutral
  4. stable
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Correct answer: B

Question 15

At equilibrium:

  1. reaction stops
  2. forward = reverse
  3. equal amounts
  4. no motion
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Correct answer: B

Question 16

Which increases reaction rate?

  1. lower temp
  2. lower concentration
  3. catalyst
  4. remove reactant
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Correct answer: C

Question 17

If pressure increases:

  1. more gas side
  2. fewer gas side
  3. liquid side
  4. no change
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Correct answer: B

Question 18

Which has hydrogen bonding?

  1. CH₄
  2. CO₂
  3. NH₃
  4. O₂
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Correct answer: C

Question 19

Dilution of acid:

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

Question 20

Which reaction is spontaneous?

  1. ΔG > 0
  2. ΔG = 0
  3. ΔG < 0
  4. ΔH > 0
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Correct answer: C

SECTION 2: FRQ

FRQ 1

Explain how Q and K determine direction of reaction.

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Key points

  • compare Q vs K
  • Q < K → forward
  • Q > K → backward

Sample answer: System shifts to reach equilibrium by comparing Q to K.

FRQ 2

Explain how temperature affects equilibrium.

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Key points

  • exo vs endo
  • heat as reactant/product
  • shift direction

Sample answer: System shifts to absorb added heat.