Explanation:
Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.
<span>NaCl (halite) or KCl (sylvite) </span>
Answer is: cesium sulfide.
Formula for ionic compound is: Cs₂S.
Ionic compound <span>electrically </span>neutral, cesium has charge +1 (2· (+1) = +2) and sulfur has charge -2.
Cesium sulfide is whide powder, soluble in water, pyrophoric in dry air, reductant.