Question

5. Decomposition reactions require energy either in the form of heat or light or
electricity for breaking down the reactants. Some examples of decomposition
reactions are given below:
(a) Calcium carbonate on heating, decomposes to give calcium oxide and carbon
dioxide.
(b) Molten sodium chloride decomposes to give sodium metal and chlorine gas on
passing electric current through it.
© Silver chloride decomposes to give silver metal and chlorine gas when it is exposed
to light. Analyse the given information and state what are decomposition
reactions. Also give the appropriate chemical reactions for each.
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Answer 1

Answer:

1. (a). caco3= cao+ CO2

• (b). Nacl = Na + cl
• (c). Agcl = Ag + cl