For the formula of salt given below, choose the correct description corresponding to the salt.

${\mathrm{CuCO}}_3$

For the formula of salt given below, choose the correct description corresponding to the salt.

${\mathrm{CuSO}}_4·5{\mathrm{H}}_2\mathrm{O}$

For the formula of salt given below, choose the correct description corresponding to the salt.
$\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$

For the formula of salt given below, choose the correct description corresponding to the salt.
${\mathrm{NaHSO}}_4$

State the term defined by the following sentence:

A soluble base

State the term defined by the following sentence:

The insoluble solid formed when two solutions are mixed together.

State the term defined by the following sentence:

Which of the following methods, A, B, C, D or E is generally used for preparing Copper ($\mathrm{II}$) chloride?

A. Action of an acid on a metal.

B. Action of an acid on an oxide or carbonate.

C. Direct combination.

D. Neutralization of an alkali by an acid.

E. Precipitation (double decomposition).