Question

2. What harmful change/s is/are brought about when a metal reacts or mixes with acids​

Answer 1

When metals react with other substances, the gradual wearing away or corrosion of a metal results.This may lead to deterioration of metals

Answer 2

Answer: hydrogen gas

When metal reacts with acids it produces metal salt and hydrogen gas ( H2 ) . All metals do not react with acids to evolve hydrogen gas . Only those metals react which is more reactive than hydrogen . When metal reacts with acid it forms a salt which is basic in nature and releases hydrogen gas.

Step-by-step explanation: