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Q. What is the pH of a 0.1 M solution of sulfuric acid (H2SO4)?

A. 1
B. 2
C. 3
D. 4

Solution

H2SO4 is a strong acid; it dissociates completely, so [H+] = 0.1 M; pH = -log(0.1) = 1.

Correct Answer: B — 2

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Q. What is the pH of a buffer solution containing 0.1 M acetic acid and 0.1 M sodium acetate?

A. 4.74
B. 5.74
C. 6.74
D. 7.74

Solution

Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Here, pKa ≈ 4.74, so pH = 4.74 + log(1) = 4.74.

Correct Answer: A — 4.74

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Q. What is the pH of a buffer solution containing 0.2 M acetic acid and 0.1 M sodium acetate?

A. 4.76
B. 5.00
C. 5.74
D. 6.00

Solution

Using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]) = 4.76 + log(0.1/0.2) = 5.74

Correct Answer: C — 5.74

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Q. What is the pH of a buffer solution made from 0.1 M acetic acid and 0.1 M sodium acetate? (2023)

A. 4.74
B. 5.00
C. 5.74
D. 6.00

Solution

Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]) = 4.74 + log(1) = 4.74.

Correct Answer: A — 4.74

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Q. What is the pH of a buffer solution made from 0.2 M acetic acid and 0.2 M sodium acetate?

A. 4.76
B. 5.76
C. 6.76
D. 7.76

Solution

Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]) = 4.76.

Correct Answer: A — 4.76

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Q. What is the pH of a neutral solution at 25°C?

A. 0
B. 7
C. 14
D. 1

Solution

At 25°C, the pH of a neutral solution is 7.

Correct Answer: B — 7

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Q. What is the pH of a neutral solution at 25°C? (2023) 2023

A. 0
B. 7
C. 14
D. 1

Solution

At 25°C, the pH of a neutral solution is 7.

Correct Answer: B — 7

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Q. What is the pH of a neutral solution of hydrogen ions?

A. 0
B. 7
C. 14
D. 1

Solution

A neutral solution has a pH of 7.

Correct Answer: B — 7

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Q. What is the pH of a solution formed by mixing 25 mL of 0.1 M HCl with 25 mL of 0.1 M NaOH? (2020) 2020

A. 7
B. 1
C. 14
D. 0

Solution

HCl and NaOH neutralize each other, resulting in a neutral solution with pH = 7.

Correct Answer: A — 7

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Q. What is the pH of a solution formed by mixing equal volumes of 0.1 M HCl and 0.1 M NaOH?

A. 7
B. 1
C. 0
D. 14

Solution

HCl and NaOH neutralize each other completely, resulting in a neutral solution with a pH of 7.

Correct Answer: A — 7

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Q. What is the pH of a solution that has a hydrogen ion concentration of 1 x 10^-5 M?

A. 5
B. 7
C. 9
D. 10

Solution

pH is calculated as pH = -log[H+]. For [H+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.

Correct Answer: A — 5

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Q. What is the pH of a solution that has a hydronium ion concentration of 1 x 10^-5 M?

A. 5
B. 7
C. 9
D. 10

Solution

pH is calculated as pH = -log[H3O+]. For [H3O+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.

Correct Answer: A — 5

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Q. What is the pH of a solution that has a hydroxide ion concentration of 1.0 x 10^-3 M?

A. 11
B. 10
C. 3
D. 1

Solution

pOH = -log[OH-] = -log(1.0 x 10^-3) = 3. Therefore, pH = 14 - pOH = 14 - 3 = 11.

Correct Answer: A — 11

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Q. What is the pH of a solution that has a [H+] concentration of 1 x 10^-7 M?

A. 7
B. 0
C. 14
D. 1

Solution

pH = -log[H+] = -log(1 x 10^-7) = 7.

Correct Answer: A — 7

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Q. What is the pH of a solution that is 0.01 M in both HCl and NaOH?

A. 0
B. 1
C. 7
D. 14

Solution

HCl and NaOH neutralize each other, resulting in a neutral solution with pH = 7.

Correct Answer: C — 7

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Q. What is the pH of a solution that is 0.1 M in both acetic acid and sodium acetate?

A. 4.76
B. 5.76
C. 6.76
D. 7.76

Solution

Using Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]); pKa of acetic acid = 4.76, so pH = 4.76 + log(1) = 4.76

Correct Answer: A — 4.76

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Q. What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

A. 10.3
B. 11.0
C. 11.5
D. 12.0

Solution

Na2CO3 is a salt of a weak acid (H2CO3) and a strong base (NaOH). The pH can be estimated using the hydrolysis of CO3^2- which gives a pH around 11.0.

Correct Answer: B — 11.0

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Q. What is the pH of a solution with 0.01 M of a weak acid with a Ka of 1.0 x 10^-5? (2023) 2023

A. 4.00
B. 5.00
C. 3.00
D. 6.00

Solution

Using the formula for weak acids, pH = 0.5(pKa - logC) = 0.5(4.00 - log(0.01)) = 5.00.

Correct Answer: B — 5.00

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Q. What is the pH of a solution with a hydrogen ion concentration of 0.001 M? (2022)

A. 3
B. 10
C. 7
D. 1

Solution

pH = -log[H+]. pH = -log(0.001) = 3.

Correct Answer: A — 3

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Q. What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M? (2019)

A. 1
B. 3
C. 7
D. 10

Solution

pH = -log[H+] = -log(1 x 10^-3) = 3.

Correct Answer: B — 3

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Q. What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-7 M?

A. 7
B. 0
C. 14
D. 1

Solution

pH = -log[H+] = -log(1 x 10^-7) = 7.

Correct Answer: A — 7

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Q. What is the pH of a solution with a hydroxide ion concentration of 0.001 M?

A. 11
B. 12
C. 13
D. 14

Solution

pOH = -log[OH-] = -log(0.001) = 3; pH = 14 - pOH = 14 - 3 = 11

Correct Answer: B — 12

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Q. What is the pH of a solution with a hydroxide ion concentration of 1.0 x 10^-4 M?

A. 10
B. 4
C. 7
D. 14

Solution

To find the pH, first calculate pOH = -log[OH-] = 4, then use pH + pOH = 14, so pH = 14 - 4 = 10.

Correct Answer: A — 10

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Q. What is the pH of a solution with [H+] = 0.00001 M?

A. 5
B. 6
C. 7
D. 8

Solution

pH = -log(0.00001) = 5.

Correct Answer: B — 6

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Q. What is the pH of a solution with [H+] = 1 x 10^-6 M?

A. 6
B. 7
C. 8
D. 5

Solution

Using the formula pH = -log[H+], we find pH = -log(1 x 10^-6) = 6.

Correct Answer: A — 6

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Q. What is the pH of a solution with [H+] = 1 x 10^-7 M? (2023)

A. 7
B. 0
C. 14
D. 1

Solution

pH = -log[H+] = -log(1 x 10^-7) = 7.

Correct Answer: A — 7

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Q. What is the pH range of acidic solutions? (2023)

A. 0-7
B. 7-14
C. 14-20
D. None of the above

Solution

Acidic solutions have a pH range of 0 to 7.

Correct Answer: A — 0-7

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Q. What is the pH range of normal human urine? (2022)

A. 4.5 - 5.5
B. 6.0 - 7.0
C. 7.5 - 8.0
D. 8.5 - 9.0

Solution

Normal human urine typically has a pH range of 6.0 to 7.0, which can vary based on diet and health.

Correct Answer: B — 6.0 - 7.0

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Q. What is the pH value of a neutral solution? (2020)

A. 0
B. 7
C. 14
D. 1

Solution

A neutral solution has a pH value of 7, which is neither acidic nor basic.

Correct Answer: B — 7

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Q. What is the phase angle in a circuit with a resistance of 30 ohms and a reactance of 40 ohms? (2021)

A. 53.13°
B. 36.87°
C. 45°
D. 60°

Solution

θ = tan⁻¹(X/R) = tan⁻¹(40/30) = 53.13°.

Correct Answer: A — 53.13°

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Major Competitive Exams

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