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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt092

Which of the following thermite-type reductions are thermodynamically possible with the metal as reductant (Al lies below Cr, Fe and Cu on the Ellingham diagram, and Cr lies below Fe)?

  1. A reduced by Fe
  2. B reduced by Al
  3. C reduced by Al
  4. D reduced by Cr

Answer: B, C

A metal whose oxide line is lower reduces the oxide of a metal whose line is higher. Al reduces and . The reverse reductions of by Fe or Cr would have positive .
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