Q3. What is an oxidation reaction? Is it exothermic or endothermic? Give onem
oxidation Reaction
Q4. Give an example of photochemical reaction.
Q. Give an example of a decomposition reaction Desertbe any activity to illusirate such
reaction by heating
06. Why is respiration considered as exothermic process?
07. Balance the following chemical equation,
Fe(s) +H2O(g) = Fe304 + H218)
MnO2 + HCI = MnCl2 + Cl2 + H20
HNO3 + Ca(OH)2 Ca(NO3)2 + H20
08. On what basis is a chemical equation balanced?
09. State any two observations in an activity suggesting the occurrence of a chemical reaction.
Q10. Name a reducing agent which may be used to obtain manganese from manganese
dioxide.
011 What change in colour is observed when silver chloride is left exposed to sunlight? Also
mention the type of chemical reaction
012. Define a combination reaction. Give one example of an exothermic combination reaction
913 What is observed when a solution of potassium iodide is added to lead nitrate solution?
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this is 12)th answer i.e combination definition and example
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