Class X

Haematite is an ore of
  1. iron
  2. aluminium
  3. copper
  4. ) tin
Which of the following pairs will give displacement reactions?
  1. NaCl solution and copper metal
  2. MgCl2 solution and aluminium metal
  3. FeSO4 solution and silver metal
  4. AgNO3 solution and copper metal.
Which non-metallic element is in liquid form ?
  1. Carbon
  2. Hydrogen
  3. Bromine
  4. Phosphorus
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
  1. calcium
  2. carbon
  3. silicon
  4. iron.
Which of the following methods is suitable for preventing an iron frying pan from rusting?
  1. Applying grease
  2. Applying paint
  3. Applying a coating of zinc
  4. All of the above.
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