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In a balanced equation ${H_2}S{O_4} + x\,HI \to {H_2}S + y\,{I_2} + z\,{H_2}O$, the values of $ x, y, z$ are

• A
  $x = 3, y = 5, z = 2$
• B
  $x = 4, y = 8, z = 5$
• ✓
  $x = 8, y = 4, z = 4$
• D
  $x = 5, y = 3, z = 4$