# Enthalpy of chemical absorption, $\Delta\: H$ in $kJ\: mol^{-1}$ is in the range of

$\begin {array} {1 1} (1)\;500-1000 & \quad (2)\;40-400 \\ (3)\;410-500 & \quad (4)\;20-30 \end {array}$

(2) 40-400