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Question 1:

What happens when an acid reacts with a base?

A) Release of oxygen gas
B) Formation of water
C) Production of a salt
D) Generation of heat

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Explanation: The correct answer is C) Production of a salt. When an acid reacts with a base, an acid-base reaction (also known as a neutralization reaction) occurs. Water and a salt are produced as a result of this reaction.

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Question 2:

What is the general chemical equation for an acid-base reaction?

A) Acid + Base → Salt + Water
B) Acid + Base → Gas + Water
C) Acid + Base → Acid + Water
D) Acid + Base → Base + Water

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Explanation: The correct answer is A) Acid + Base → Salt + Water. The general chemical equation for an acid-base reaction involves the acid and base combining to form a salt and water.

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Question 3:

Which of the following substances is NOT considered an acid?

A) Hydrochloric acid (HCl)
B) Sodium hydroxide (NaOH)
C) Sulfuric acid (H2SO4)
D) Nitric acid (HNO3)

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Explanation: The correct answer is B) Sodium hydroxide (NaOH). Sodium hydroxide is a base, not an acid. It is commonly known as caustic soda and is often used as a strong alkaline solution.

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Question 4:

What is the product of the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?

A) Sodium chloride (NaCl) + Water (H2O)
B) Hydrochloric acid (HCl) + Sodium hydroxide (NaOH)
C) Sodium chloride (NaCl) + Sodium hydroxide (NaOH)
D) Hydrochloric acid (HCl) + Water (H2O)

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Explanation: The correct answer is A) Sodium chloride (NaCl) + Water (H2O). The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) results in the formation of sodium chloride (NaCl) and water (H2O).

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Question 5:

What happens to the pH of a solution when an acid reacts with a base?

A) The pH remains the same
B) The pH becomes more acidic
C) The pH becomes more basic
D) The pH becomes neutral

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Explanation: The correct answer is D) The pH becomes neutral. When an acid reacts with a base in an acid-base reaction, they neutralize each other, resulting in a solution with a pH close to 7, which is considered neutral.