Question

Give a balanced equation when:
(d) a mixture of ethene and hydrogen is passed over nickel at ${200}^{\circ }$C

Answer 1

The balanced equation is
$C_2{H}_4+H_2\underset{{200}^{\circ }}{\overset{Ni}{\to }}{C}_2{H}_6$
Product: ethane
This reaction is a hydrogenation reaction where ethene is passed over a catalyst like Ni at 200°C, or Pd, Pt at ordinary temperature. Two atoms of hydrogen are added with ethene gives ethane.