If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be:
The correct option is D $$infinite$$
According to Heisenberg's Uncertainty Principle, it is impossible to measure position $$x$$ and momentum $$p$$ simultaneously.
Use $$\Delta x \Delta p \geqslant h/4\pi $$
as $$\Delta x \rightarrow 0, \Delta p \rightarrow \infty $$
Here, neither uncertainty can be zero and if the position is zero the uncertainty in momentum becomes infinite.
So, option D is correct.