Which acid is formed when hydrochloric acid reacts with ethanoic anhydride?

Distinguish between the following pair of compounds using the reagent given in the bracket.

Dilute hydrochloric acid and dilute sulphuric acid. (using lead nitrate solution)

Choose the method of preparation of Lead chloride, from the methods given in the list:

[List: A. Neutralization B.Precipitation C.Direct combination D.Substitution]

Identify the type of reaction given below:

$\underset{\mathrm{Iron} \left(\mathrm{II}\right) \mathrm{sulphide}}{\mathrm{FeS}}+\underset{\mathrm{Hydrochloric} \mathrm{acid}}{2\mathrm{HCl}}\to \underset{\mathrm{Ferrous} \mathrm{chloride}}{{\mathrm{FeCl}}_2}+\underset{\mathrm{Hydrogen} \mathrm{sulphide}}{{\mathrm{H}}_2\mathrm{S}\uparrow }$

Identify the gas evolved $\left(\mathrm{Y}\right)$ in the following equation:

$\underset{\mathrm{Sodium} \mathrm{sulphite}}{{\mathrm{Na}}_2{\mathrm{SO}}_3}+\underset{\mathrm{Hydrochloric} \mathrm{acid}}{\mathrm{HCl}}\to \underset{\mathrm{Sodium} \mathrm{chloride}}{\mathrm{NaCl}}+\mathrm{Y}\underset{}{\uparrow }+{\mathrm{H}}_2\mathrm{O}$