Provide the full forms of the following:
$(i)$ $AZT$
$(ii)$ $CFC$
$(iii)$ $SI$

If the number of $H^{+}$ ions in $1 \ L$ of distilled water is $6.023 \times 10^{16}$,what is the number of $H^{+}$ ions in $1 \ mL$ of distilled water?

If the diameter of a carbon atom is $0.15 \,nm$,calculate the number of carbon atoms which can be placed side by side in a straight line across the length of a scale of length $20 \,cm$.

The prefix $10^{18}$ is

What is the $SI$ unit of mass? How is it defined?

$4 \ L \ atm$ is equal to (in $cal$)