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Question (11)

QN0035882

A solution contains 0.10 mol H+ ions and another contains 0.001 mol H+ ions in comparable volumes. Which has the lower pH?

(A) The first solution
(B) The second solution
(C) Both have the same pH
(D) pH cannot depend on H+ concentration

Correct Answer: A

Explanation:

Higher hydronium ion concentration corresponds to lower pH.

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Question (12)

QN0035883

Four solutions have pH values 3, 6, 8 and 12. Which one has the highest hydroxide-ion concentration according to the pH scale?

(A) pH 3
(B) pH 6
(C) pH 8
(D) pH 12

Correct Answer: D

Explanation:

Increasing pH from 7 to 14 corresponds to increasing OH- concentration.

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Question (13)

QN0035884

A solution has pH 7. If its pH changes to 5, what has happened to its acidic character?

(A) It has decreased
(B) It has increased
(C) It has remained unchanged
(D) It has become strongly alkaline

Correct Answer: B

Explanation:

A pH below 7 represents an acidic solution, and lower pH indicates greater H+ concentration.

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Question (14)

QN0035885

Solution X has pH 4 and solution Y has pH 9. Which statement is correct?

(A) X is basic and Y is acidic
(B) Both are neutral
(C) X is acidic and Y is basic
(D) Both are acidic

Correct Answer: C

Explanation:

pH values below 7 are acidic and values above 7 are basic.

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Question (15)

QN0035886

Five solutions have pH values 2, 5, 7, 10 and 13. Which solution is closest to neutral according to the pH scale?

(A) pH 2
(B) pH 5
(C) pH 7
(D) pH 13

Correct Answer: C

Explanation:

A neutral solution has pH exactly 7.

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Question (16)

QN0035887

Two 1 M acids, HCl and CH3COOH, are taken. HCl produces more H+ ions than CH3COOH. Which conclusion follows?

(A) HCl is the weaker acid
(B) CH3COOH is the stronger acid
(C) HCl is the stronger acid
(D) Both must have equal strength because their concentration is equal

Correct Answer: C

Explanation:

Strong acids produce more H+ ions than weak acids at the same concentration.

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Question (17)

QN0035888

Equal lengths of Mg ribbon are placed in two test tubes containing equal amounts and concentrations of HCl and CH3COOH. Which tube is expected to show more vigorous fizzing?

(A) HCl tube
(B) CH3COOH tube
(C) Both exactly equally
(D) Neither tube

Correct Answer: A

Explanation:

HCl is a strong acid and produces more H+ ions than acetic acid of the same concentration.

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Question (18)

QN0035889

A student dilutes an acid by adding water. Which change occurs?

(A) H3O+ concentration per unit volume increases
(B) H3O+ concentration per unit volume decreases
(C) OH- concentration becomes zero
(D) The acid becomes a salt immediately

Correct Answer: B

Explanation:

Dilution decreases the concentration of H3O+ ions per unit volume.

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Question (19)

QN0035890

Why does an aqueous HCl solution conduct electricity while glucose solution does not?

(A) HCl is always metallic
(B) HCl produces ions in water, while glucose does not produce such ions
(C) Glucose produces more ions than HCl
(D) Water conducts only with organic compounds

Correct Answer: B

Explanation:

Acidic solutions conduct because ions carry electric current; glucose solution does not produce such ions.

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Question (20)

QN0035891

Dry HCl gas is brought into contact with dry blue litmus paper, but no colour change occurs. What is the best explanation?

(A) HCl is not an acid
(B) HCl needs water to produce H+/H3O+ ions responsible for acidic behaviour
(C) Blue litmus reacts only with bases
(D) HCl produces OH- ions in dry conditions

Correct Answer: B

Explanation:

HCl produces hydronium ions in the presence of water; H+ cannot separate from HCl without water.

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Question (11)

A solution contains 0.10 mol H+ ions and another contains 0.001 mol H+ ions in comparable volumes. Which has the lower pH?

Explanation:

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Question (12)

Four solutions have pH values 3, 6, 8 and 12. Which one has the highest hydroxide-ion concentration according to the pH scale?

Explanation:

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Question (13)

A solution has pH 7. If its pH changes to 5, what has happened to its acidic character?

Explanation:

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Question (14)

Solution X has pH 4 and solution Y has pH 9. Which statement is correct?

Explanation:

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Question (15)

Five solutions have pH values 2, 5, 7, 10 and 13. Which solution is closest to neutral according to the pH scale?

Explanation:

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Question (16)

Two 1 M acids, HCl and CH3COOH, are taken. HCl produces more H+ ions than CH3COOH. Which conclusion follows?

Explanation:

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Question (17)

Equal lengths of Mg ribbon are placed in two test tubes containing equal amounts and concentrations of HCl and CH3COOH. Which tube is expected to show more vigorous fizzing?

Explanation:

Link:

Question (18)

A student dilutes an acid by adding water. Which change occurs?

Explanation:

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Question (19)

Why does an aqueous HCl solution conduct electricity while glucose solution does not?

Explanation:

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Question (20)

Dry HCl gas is brought into contact with dry blue litmus paper, but no colour change occurs. What is the best explanation?

Explanation:

Link:

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