Class X

Which of the following metals is present in the anode mud during the electrolytic refining of copper?
  1. Sodium
  2. Aluminium
  3. Gold
  4. Iron
Which of the following metals is present in the anode mud during the electrolytic refining of copper?
  1. Sodium
  2. Aluminium
  3. Gold
  4. Iron
The second most abundant metal in the earth’s crust is
  1. oxygen
  2. silicon
  3. aluminium
  4. iron
During smelting, an additional substance is added which combines with impurities to form a fusible product known as
  1. slag
  2. mud
  3. gangue
  4. flux
Silver articles becomes black on prolonged exposure to air. This is due to the formation of
  1. Ag2O
  2. Ag2S
  3. AgCN
  4. Ag2O and Ag2S
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