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  1. a. conc. H2SO4 have the dehydrating property.The litmus paper maybe is a organic substance which contain carbon and...

  2. dehydrating ......... CxH2xOx -------------------->Cx+xH2O (carbonhydrates) (black)

  3. conc H2SO4 can act as a dehydrating agent, so they would not react. HCl唔可以比conc.sulphuric acid去dry because both of them are acid,then they will not not reaction.

  4. ... water of crystallization and also conc. H2SO4 has dehydrating property while conc. HNO3 does not. So the observations...