A piece of zinc metal is dropped in dilute solution of hydrochloric acid. Answer the following:
Which gas is liberated when the metal reacts with the acid?

A piece of zinc metal is dropped in dilute solution of hydrochloric acid. Answer the following:

How will you test the presence of the liberated gas?

Complete the following reaction,

${\left({\mathrm{CaSO}}_4\right)}_2.{\mathrm{H}}_2\mathrm{O}+{\mathrm{H}}_2\mathrm{O}\to$

Complete the following reaction:

${\mathrm{CaCO}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{dil}.\right)\to$