MCQ
Bullet-proof steel alloy is prepared by using
- A$Sc$
- B$Ni$
- ✓$Zr$
- D$Zn$
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$(I)$ $S_2O_4^{2-}$ $(II)$ $S_2O_5^{2-}$ $(III)$ $S_2O_6^{2-}$