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
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 among the following alloys contain non-metal as one of its constituents?
  1. Brass
  2. Amalgam
  3. Gun metal
  4. None of these
The bronze medals are made up of
  1. Cu and Zn
  2. Zn and Ni
  3. Cu and Sn
  4. Cu, Zn, Tn
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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