Question

When $Fe\left(s\right)$ is dissolved in aqueous hydrochloric acid in a closed vessel, the work done is positive.
If true enter 1, else enter 0.

Answer 1

When Fe(s) is dissolved in aqueous hydrochloric acid in a closed vessel, the work done is negative.
Fe reacts with HCl to form iron(III) chloride and hydrogen gas.
$2Fe+6HCl\to 2FeC{l}_3+3H_2$
The liberated hydrogen gas does the work. Since, the work is done by the system, it is negative.