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Chemical Equilibrium /
2026 /
Quiz 8

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NCAT Practice Test - Practice Test - Chemistry - Chemical Equilibrium - 2026 Quiz

Attempt 10 MCQs on NCAT Practice Test - Practice Test - Chemistry - Chemical Equilibrium (Year 2026) | Quiz 8

71. What is the function of a buffer solution?

Resists pH change
Maintains constant temperature
Increases conductivity
Changes color

72. What is the composition of an acidic buffer?

Weak acid + its salt
Strong acid + strong base
Weak base + its salt
Strong acid + salt

73. What is the composition of a basic buffer?

Weak base + its salt
Weak acid + salt
Strong base + salt
Neutral salt

74. What is the Henderson-Hasselbalch equation for an acidic buffer?

pH = pKa + log([salt]/[acid])
pH = pKa + log([acid]/[salt])
pH = pKb + log([base]/[salt])
pH = pKa - log([salt]/[acid])

75. What is the pH of a 0.1 M acetic acid/0.1 M acetate buffer? (pKa=4.74)

4.74
7.0
1.0
10.0

76. When is buffer capacity maximum?

[acid] = [salt]
[acid] > [salt]
[salt] > [acid]
pH = 7

77. Which buffer is important in blood?

Phosphate buffer
Acetate buffer
Carbonate buffer
Borate buffer

78. What is the primary buffer in blood plasma?

Bicarbonate buffer
Phosphate buffer
Protein buffer
Ammonia buffer

79. Calculate the pH of 0.2 M NH3 / 0.3 M NH4Cl buffer.

9.08
4.74
9.26
8.90

80. What happens to buffer components when HCl is added?

Conjugate base to acid
Acid to conjugate base
Both increase
Both decrease

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