(b) Magnesium and dilute hydrochloric acid react to produce magnesium chloride solution and hydrogen.
Mg(s) + 2 HCl(aq)
MgCl2(aq) + H2(g)
(i)
State two observations that could be made during the reaction.

well in order to answer this question you have to provide more information < 3

i believe the answer is a.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.