____ gas obtained from natural gas, is used in the production of fertilisers (urea).
Hydrogen gas obtained from ________ is used in the production of fertilisers (urea).
Hydrogen gas, obtained from __, is used in the production of fertilisers(urea).
Which of the following is being used as a source of hydrogen gas needed to manufacture fertilisers ?
(a) Biogas
(b) Natural gas
(c) Coal gas
(d) Petroleum gas