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Case Studies (Science) 

1.1 white precipitate is obtained
1.2 0-5 min
1.3 photosynthesis
1.4 polluted water is acidic in nature hence it reacts with calcium carbonate
1.5 calcium oxide

2.1 (c) redox reaction

2.2 (a) dry `Ca(OH)_2`

2.3 (a) `MnO_2` is getting reduced whereas `HCl` is getting oxidized

2.4 (b) Basic oxide

2.5 (b) Reaction will not occur