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Which of the following is used in thermite welding ?
[AMU (Engg.) 2010]
(a) \( \mathrm{TiO}_{2}+4 \mathrm{Na} \longrightarrow \mathrm{Ti}+2 \mathrm{Na}_{2} \mathrm{O} \)
(b) \( 2 \mathrm{Al}+\mathrm{Fe}_{2} \mathrm{O}_{3} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Fe} \)
\( P \)
(c) \( \mathrm{SnO}_{2}+2 \mathrm{C} \longrightarrow \mathrm{Sn}+2 \mathrm{CO} \)
(d) \( \mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr} \)
W.
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