TheS.I unit of gravitational constant G is
N $ kg^{-2} $
Nm $ kg^{-1} $
N $ m^{2} kg^{-1} $
N $ m^{2} kg^{-2} $
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Choose the correct answer:The itai-itai disease of Japan was caused due to
I. Arsenic pollution
II. Cyanide pollution
III. Cadmium pollution
IV. Lead pollution