Q3 of 20 Page 143

Answer the following:

During winter many plant leaves fallen on the earth do not cause pollution. But plastic papers which are thrown on the earth cause pollution. Name the types of chemical reaction associated with this observation.

The type of chemical reaction associated with this observation is an exothermic reaction.


i) It is a reaction in which heat is also released along with the formation of products.


ii) Plastic papers releases too much energy.


iii) The energy they release is very harmful to the environment.


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3

Answer the following:

Classify the following into chemical combination, decomposition, displacement and double displacement reaction.


a) CaCO3 CaO + CO2↑


b) 2AgNO3 + Cu → Cu(NO3)2 + 2Ag ↓


c) 2SO2 + O2→ 2SO3↑


d) NaCl + AgNO3→ AgCl ↓ +NaNO3

3

Answer the following:

Write the advantages of writing a chemical equation using formulae and symbols.

 3

Answer the following:

L.P.G. gas contains butane. Its molecular formula is C4H10. Name the possible products obtained by its complete combustion.

 3

Answer the following:

Suggest some measures to avoid rancidity of oils.