How many of the following reduction processes are correct : (1) \( ...
0How many of the following reduction processes are correct :
(1) \( \mathrm{B}_{2} \mathrm{O}_{3}+\mathrm{Al} \stackrel{\Delta}{\longrightarrow} \) B. \( \quad \) (2) \( \mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \stackrel{\Delta}{\longrightarrow} \mathrm{Cr} \).
\( \mathrm{P} \)
(3) \( \mathrm{TiCl}_{4}+\mathrm{Mg} \stackrel{\Delta}{\longrightarrow} \) Ti. (4) \( \mathrm{PbS}+\mathrm{PbO} \stackrel{\Delta}{\longrightarrow} \mathrm{Pb} \).
W
(5) \( 3 \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{CO} \longrightarrow 2 \mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO}_{2} \)
(6) \( \mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO} \longrightarrow 3 \mathrm{FeO}+\mathrm{CO}_{2} \)
(7) \( 2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{~S} \longrightarrow 6 \mathrm{Cu}+\mathrm{SO}_{2} \)
(8) \( \mathrm{SnO}_{2}+\mathrm{C} \rightarrow \mathrm{SnO}+\mathrm{CO} \uparrow \)
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