chapter: chemical reaction and equations
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17. displacement reaction.
18. no reaction take place.
19. magnesium oxide.
20. reaction (1) &(2)
24. displacement reaction.
25. combination reaction.
26. decomposition reaction.
27. 2KCLO3 ------->2KCL+O3
28. Ca+Cl2--------->CaCl2
29. single displacement reaction.
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