Class X

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
An aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that
  1. Green solution slowly turns brown
  2. Lower end of test tube become slightly warm
  3. A colourless gas with the smell of burning sulphur is observed
  4. Light green solution changes to blue.
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
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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