If hydrogen and alkene are passed over finely divided nickel,it is caleed as hydrogenation of alkenes which gives alkanes as products.
Hence option A is correct.
Hydrogen is readily adsorbed by nickel,palladium at room temperature. One volume of palladium can adsorb 900 volumes of hydrogen. So if I put finely divided palladium in water, will it adsorb all hydrogen and leave only oxygen? If no, why?