- Acids generally release H2 gas when they react with
a. nonmetals. b. semimetals. c. active metals. d. inactive metals

c. active metals

Explanation:

This is because of the arrangement of electrons in its structure.

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answer: i would say b.

explanation:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e