14. All of the following are properties of zinc. Which of the following are chemical properties of zinc? (A) Zinc produces hydrogen gas when placed in acid. (B) Zinc melts at 419∘ C. (C) The density of zinc is 7.1 g/cm3. (D) Zinc is a grey metal. (E) Zinc corrodes in moist air. (F) Zin is pulverized.1 pointA onlyA, C and EA and E onlyC and D onlyB and C onlyA, E and F only
Question
- All of the following are properties of zinc. Which of the following are chemical properties of zinc? (A) Zinc produces hydrogen gas when placed in acid. (B) Zinc melts at 419∘ C. (C) The density of zinc is 7.1 g/cm3. (D) Zinc is a grey metal. (E) Zinc corrodes in moist air. (F) Zin is pulverized.1 pointA onlyA, C and EA and E onlyC and D onlyB and C onlyA, E and F only
Solution
Chemical properties are characteristics that are observed during a reaction where the chemical composition of a substance is changed.
(A) Zinc produces hydrogen gas when placed in acid. - This is a chemical property because it involves a chemical reaction with acid.
(B) Zinc melts at 419∘ C. - This is a physical property because it describes a state of matter change, not a chemical reaction.
(C) The density of zinc is 7.1 g/cm3. - This is a physical property because it describes the amount of mass in a given volume, not a chemical reaction.
(D) Zinc is a grey metal. - This is a physical property because it describes the appearance, not a chemical reaction.
(E) Zinc corrodes in moist air. - This is a chemical property because corrosion involves a chemical reaction with the environment.
(F) Zinc is pulverized. - This is a physical property because it describes a change in the form of zinc, not a chemical reaction.
So, the chemical properties of zinc from the given options are A and E only.
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