Match the following
| Set 1 | Set 2 |
| (1) Electrolysis | (p) Wide range of temperature |
| (2) Zone refining | (q) Adsorption |
| (3) Blast furnace | (r) Electrode potential |
| (4) Liquation | (*) Noble gas atmosphere |
| | (t) Low melting point |
(a) 1-r, 2-t, 3-p, 4-t
(b) 1-r, 2-*, 3-p, 4-t
(c) 1-r, 2-* & t, 3-p, 4-q
(d) 1-t, 2-*, 3-p, 4-r
