Q2.  How will you test for the gas which is liberated when HCL reacts with an active metal?Q3.  What is an oxidation reaction? Is it exothermic or endothermic? Give one example of oxidation Reaction.Q4.  Give an example of photochemical reaction.Q5.  Give an example of a decomposition reaction. Describe any activity to illustrate such a reaction by heating.Q6.  Why is respiration considered as exothermic process?Q7.  Balance the following chemical equation.           Fe(s) +H2O(g) = Fe3O4 + H2(g)           MnO2 + HCL = MnCl2 + Cl2 + H2O           HNO3 + Ca(OH)2 = Ca(NO3)2 + H2OQ8.  On what basis is a chemical equation balanced?Q9.  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.Q11.  What change in colour is observed when silver chloride is left exposed to sunlight? Also mention the type of chemi
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Q2 by bringing a burning candle near the mouth of test tube containing h2 gas. H2 gas burns with a pop sound. Q. 6 first give brief explanation of respiration. Since respiration releases a lot of heat energy it is an exothermic reaction. Q. 9 evolution of a gas and change in temperature Q 10 aluminium Q 11 white AgCl changes to grey colour. It is photo decomposition reaction.
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