The difference between Gram atomic  mass and Gram atomic molecular are given below:

Yes, if the angle between the two vectors is more than 90^o but less than 270⁰. (cosΘ is negative)

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zinc will react with sulphuric acid forming zinc sulphate dissolved in solution and releasing hydrogen gas.
Zn + conc. 2 H2SO4 ZnSO4 + SO2 + 2 H2O

ii)Transition metals and their compounds show catalytic activities because of Variable or multiple oxidation states, ability to form complexes, they provide large surface area for adsorption.