Gay-Lussac's law of gaseous volumes is derived from $.......$.

Reduction of $2.4 \ g$ of $FeO$ with hydrogen yields $1.68 \ g$ of $Fe$. In another experiment,$2.9 \ g$ of $FeO$ on reduction with hydrogen yields $2.03 \ g$ of $Fe$. These results illustrate the law of:

In two compounds,each containing tin $(Sn)$ and oxygen,the composition is as follows. Which law of chemical combination can be illustrated by this data?

Compound	$\% Sn$	$\% O$
$A$	$78.77$	$21.23$
$B$	$88.12$	$11.88$

Zinc sulphate contains $22.65\%$ of zinc and $43.9\%$ of water of crystallization. If the law of constant proportions is true,then the weight of zinc required to produce $20\, g$ of the crystals will be ............. $g$.

Which of the following pairs of substances illustrates the Law of Multiple Proportions?

$1.7 \, g$ of silver nitrate is dissolved in $100 \, g$ of water. Another $0.585 \, g$ of sodium chloride is dissolved in $100 \, g$ of water and added to the first solution,resulting in a chemical reaction. $1.435 \, g$ of silver chloride and $0.85 \, g$ of sodium nitrate are produced. Which law is followed by the above information?