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Why should a magnesium ribbon be cleaned before burning in air?
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
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.​

Answer 1

Answer:

becoze , when magnesium ribbon come out in air then itself it started to burn.

(I) H2 + cl2 =2HCl

(ii) 3BaCl2 + Al2(SO4)3=3Baso4 + 2AlCl3

Answer 2

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Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxide (MgO) layer which is a very stable compound. In order to prevent further reactions with Oxygen, it is therefore necessary to clean the ribbon by to remove the layer of MgO.

i) H2 + Cl2 → 2HCl

ii) 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4

iii) 2Na + 2H2O → 2NaOH + H2