Q32 of 152 Page 19

When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.

2KN03 (s) 2KN02 (s) + 02 (g)

The equation is balanced and state symbols are denoted with the compounds.



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30 Write a balanced chemical equation for the process of photosynthesis giving the physical states of all the substances involved and the conditions of the reaction. 31 Translate the following statement into chemical equation and then balance it :

Barium chloride solution reacts with aluminium sulphate solution to form a precipitate of barium sulphate and aluminium chloride solution.

 33 What is meant by a chemical reaction? Explain with the help of an example. 33 Give one example each of a chemical reaction characterised by:

(i) evolution of a gas


(ii) change in colour


(iii) formation of a precipitate


(iv) change in temperature


(v) change in state.