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                                    4. Classify the following into chemical combination, decomposition,displacement and double displacement reaction.a) CaCO, heat Cao + co,1 b) 2Ag NO,+ Cub 2SO2 + O2Cu(NO)+2Ag |3/2d) NaCl + AgNO3AgCl +NaNO | 
                            
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Answer»  a) decomposition reactionb) combination reactionc)single displacement reactiond)double displacement reaction  | 
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