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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt042

Select the correct statement(s) about the Ellingham diagram for oxides.

  1. ABelow the temperature at which the line meets the line of a metal oxide, carbon cannot reduce that oxide
  2. BThe line for slopes downwards because the reaction increases the amount of gas
  3. CThe line for a metal oxide becomes steeper (more positive slope) at the boiling point of the metal
  4. DA metal whose oxide line lies above the line can reduce

Answer: A, B, C

Below the intersection the line lies above the oxide line, so the coupled is positive (true). The carbon line slopes down since (true). When the metal boils, one more gaseous species is lost on oxidation, so becomes more negative and the slope more positive (true). A metal can reduce only oxides whose lines lie above its own, so a metal whose line is above cannot reduce it (false).
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