Acidified potassium permanganate solution is decolourised by

What is $Anthoceros$?

The locus of the centroid of the triangle with vertices at $(a \cos \theta, a \sin \theta)$,$(b \sin \theta, -b \cos \theta)$ and $(1, 0)$ is (where $\theta$ is a parameter).

The maximum area of a right-angled triangle with hypotenuse $h$ is

If the volume of a parallelepiped with coterminous edges $4 \hat{i} + 5 \hat{j} + \hat{k}$,$-\hat{j} + \hat{k}$,and $3 \hat{i} + 9 \hat{j} + p \hat{k}$ is $34$ cubic units,then $p$ is equal to:

The angle between the lines whose intercepts on the axes are $a, -b$ and $b, -a$ respectively is .....