Which of the following does not give oxygen on heating?

Which of the following is logically equivalent to $\sim(\sim p \Rightarrow q)$?

The equation of the pair of lines passing through the origin whose sum and product of slopes are respectively the arithmetic mean and geometric mean of $4$ and $9$ is

Two ions having masses in the ratio $1: 1$ and charges $1: 2$ are projected into a uniform magnetic field perpendicular to the field with speeds in the ratio $2: 3$. The ratio of the radii of circular paths along which the two particles move is :

Bundle of His is a part of which one of the following organs in humans?

Which one of the following is most effective in causing the coagulation of an $As_2S_3$ sol?