Question

Write down chemical equation for the reaction taking place when-
A). Iron reacts with steam B). Hydrated copper sulphate is heated
C). Egg shells are dissolved in HCl​

Answer 1

Answer:

A)  Iron react with steam to form the metal oxide and hydrogen. 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)

B) When the hydrated salt (CuSO₄. 5H₂O ) is heated, it loses its water of crystallization and becomes anhydrous salts (without water of crystallization). The blue colour of CuSO₄ is due to the presence of water of crystallisation. Hence, when it loses its water of crystallization, the solution becomes colourless.

C) Egg shell contains calcium carbonate. When HCl is poured over egg shells, it dissolves in HCl to form calcium chloride and water and carbon dioxide is liberated with effervescence