Which of the following pairs regarding the effect of alloying elements in steel are correctly matched?
1. Molybdenum: Forms abrasion resisting particles
2. Phosphorous: Improves merchability in free cutting steels
3. Cobalt: Contributes to red hardness by hardening ferrite
4. Silicon Reduces oxidation resistance
Which of these statements are correct?
(a) 2,3 and 4 (b) 1,3 and 4
(c) 1,2 and 3 (d) 1,2 and 4