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InterviewSolution
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Question : (a) List any three observations which determine that a chemical reaction has taken place . Also list three informations that cannot be obtained abouta chemical reaction, merely by its chemical equation. (b) Balance the following chemical equations. (i) Fe+H_(2)OrarrFe_(3)O_(4)+H_(2) (ii) CO_(2)+H_(2)O rarr C_(6)H_(12)O_(6)+O_(2) |
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Answer» Solution :The THREE observations are i) Change of colour ii) Change of temperature ii) Evolution of gas The three information are i) Atmospheric conditions ii) catalyst inolved iii) Physical state of reactants and products Balancing equations i) `3Fe+4H_(2)O to Fe_(3)O_(4) +4H_(2)` ii) `6CO_(2) + 6H_(2)O to C_(6)H_(12)O_(6) + 6O_(2)` OR a) i) Oxidation : It is defined as PROCESS which involves gain of oxygen for example `2Mg(s) + O_(2)(g) to 2MgO(s)` Magnesium oxygen Magnesiumoxide. ii) Reduction: It is defind as the process which involves loss of oxygen for example `CuO_((s)) + H_(2)(g) to Cu(s) + H_(2)O(g)` Copper Hydrogen Copper Water b)i) `2HNO_(3aq)+ Ca(OH)_(2aq) to Ca(NO_(3))_(2aq) + H_(2)O` ii) `2NaOH_(AQ) + H_(2)SO_((4)(aq)) to Na_(2) SO_((4)(aq)) + 2H_(2)O(I)` |
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