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Why should a magnesium ribbon be cleaned before it is burnt in air?
Magnesium ribbon must be cleaned before burning in the air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed to get the desired chemical reaction.
Write the balanced equation for the following chemical reactions.
(i) Hydrogen + Chlorine → Hydrogen chloride
(ii) Barium chloride + Aluminium sulphate → Barium sulphate +
Aluminium chloride
(iii) Sodium + Water → Sodium hydroxide + Hydrogen
(i) 
(ii) 
(iii) 
Write a balanced chemical equation with state symbols for the following reactions.
(i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
(i) 
(ii) 
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