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JEE Main levelSingle correct optionDifficulty 2 of 3mt130

Assertion (A): During the cyanide leaching of gold, air is bubbled through the mixture. Reason (R): Oxygen oxidises gold to Au(I), which is stabilised as .

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

shows that oxygen is the oxidant and cyanide is the ligand which shifts the Au(I)/Au potential. Without air gold would not dissolve, so both statements are true and R explains A.
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