Name a metal which combines with hydrogen gas.

X is the product formed when sulphur reacts with oxygen. It dissolves in water to produce Y. Choose the correct option for X and Y.

Aluminium is used for making cooking utensils. Which of the following properties of aluminium is responsible for the same? 
$\left(\text{i}\right)$ Good thermal conductivity

$\left(\text{ii}\right)$ Good electrical conductivity

$\left(\text{iii}\right)$ Ductility

$\left(\text{iv}\right)$ High melting point

Which of the following metals exist in their native states in nature? 
$\left(\text{i}\right)$ $\text{Cu}$

$\left(\text{ii}\right)$ $\text{Au}$

$\left(\text{iii}\right)$ $\text{Zn}$

$\left(\text{iv}\right)$ $\text{Ag}$