Which of the following contains the maximum number of molecules?

Which of the following correctly represents $360 \, g$ of water?
$(i)$ $2$ moles of $H_2O$
$(ii)$ $20$ moles of water
$(iii)$ $6.022 \times 10^{23}$ molecules of water
$(iv)$ $1.2044 \times 10^{25}$ molecules of water

State whether the following statement is true or false:
$A$ group of atoms carrying a charge is called bivalent ions.

Name the international organization that approves the names of elements. Give an example with an explanation to show that the Law of Conservation of Mass applies to physical changes as well.

Calculate the mass of $10$ carbon atoms.

What is the $SI$ prefix for each of the following multiples and submultiples of a unit?
$(a)$ $10^{3}$
$(b)$ $10^{-1}$
$(c)$ $10^{-2}$
$(d)$ $10^{-6}$
$(e)$ $10^{-9}$
$(f)$ $10^{-12}$