Which of the following metals will not react with hydrochloric acid (HCl)?

A. Iron (Fe)

B. Magnesium (Mg)

C. Zinc (Zn)

D. Gold (Au)

Answer Explanation:

Gold (Au) is a noble metal and does not react with hydrochloric acid (HCl). Iron, magnesium, and zinc are reactive metals that can undergo displacement reactions with hydrochloric acid to produce hydrogen gas.

Therefore, the Correct Answer is D.

Q #1: Which of the following metals will not react with hydrochloric acid (HCl)?

A. Iron (Fe)

B. Magnesium (Mg)

C. Zinc (Zn)

D. Gold (Au)

Answer Explanation

Gold (Au) is a noble metal and does not react with hydrochloric acid (HCl). Iron, magnesium, and zinc are reactive metals that can undergo displacement reactions with hydrochloric acid to produce hydrogen gas.
Q #2: What effect do acids have on indicators like litmus paper?

A. Turn it blue

B. Turn it red

C. Turn it green

D. No effect

Answer Explanation

Acids turn litmus paper red. Litmus is a common indicator that changes color in response to the acidity or basicity of a solution. In the presence of an acid, litmus paper turns red.
Q #3: How does the reaction of an acid with a base affect the pH of the resulting solution?

A. The pH increases

B. The pH decreases

C. The pH remains unchanged

D. It depends on the specific acid and base

Answer Explanation

When an acid reacts with a base in a neutralization reaction, the pH of the resulting solution remains unchanged if the quantities of acid and base are stoichiometrically balanced. This is because the \(H^+\) ions from the acid react with the \(OH^-\) ions from the base to form water, effectively neutralizing each other.

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Which of the following metals will not react with hydrochloric acid (HCl)?

More Questions on TEAS 7 Science

Q #1: Which of the following metals will not react with hydrochloric acid (HCl)?

Answer Explanation

Q #2: What effect do acids have on indicators like litmus paper?

Answer Explanation

Q #3: How does the reaction of an acid with a base affect the pH of the resulting solution?

Answer Explanation

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