In the reaction, Ca $+2$H$2$O $=$ Ca$($OH$)2+$ H$2$; what volume $($c$.$c$.)$ of hydrogen at STP would be liberated, when $8$ gm of calcium reacts with excess water $?($Atomic weight of calcium $=40)$

$4480$

$2240$

$1120$

$0\mathrm{.}4$