The difference between Gram atomic mass and Gram atomic molecular are given below:
Yes, if the angle between the two vectors is more than 90o 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

Congratulations Sachin!!