1.

Which combination cannot be used for thepreparation of hydrogen gas in the laboratory? I.Zn/conc.H2SO4(Impure Zinc is used) II.Zn/dil.HNO3 (Impure Zinc is used) III.Zn/dil.H2SO4 (Very highly pure Zn is used)

Answer»

Which combination cannot be used for thepreparation of hydrogen gas in the
laboratory?

I.Zn/conc.H2SO4(Impure Zinc is used)

II.Zn/dil.HNO3 (Impure Zinc is used)

III.Zn/dil.H2SO4 (Very highly pure Zn is used)




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