Class X

Rusting of iron takes place in
  1. ordinary water
  2. distilled water
  3. both ordinary and distilled water
  4. none of the above
Which among the following alloys contain non-metal as one of its constituents?
  1. Brass
  2. Amalgam
  3. Gun metal
  4. None of these
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
An element reacts with oxygen to give a compound with a high melting point. The compound is soluble in water. The element is likely to be
  1. calcium
  2. carbon
  3. iron
  4. silicon
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
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