Electrons from excited chlorophyll molecule of photosystem $II$ are accepted first by

Acetic acid is reacted with metallic sodium to form hydrogen and $X$. When $X$ is heated with sodalime,$Y$ and sodium carbonate are formed. $Y$ is

Which of the following pairs of ions have the same paramagnetic moment?

If the parametric equations of the circle passing through the points $(3,4), (3,2)$ and $(1,4)$ are $x=a+r \cos \theta$ and $y=b+r \sin \theta$,then find the value of $b^a r^a$.

Data Entry - Physics

Which of the following statements is incorrect?