Which one of the following reactions does not form a gaseous product?

$\int \frac{\log \sqrt{x}}{3 x} dx$ is equal to

$A$ uniform rod $AB$ of length $L$ and mass $M$ is lying on a smooth table. $A$ small particle of mass $m$ strikes the rod with a velocity $v_0$ at point $C$ at a distance $x$ from the centre $O$. The particle comes to rest after the collision. The value of $x$,so that point $A$ of the rod remains stationary just after the collision,is:

Archegonia and antheridia in homosporous pteridophytes are present in:

Let $A$ and $B$ be independent events with $P(A)=0.3$ and $P(B)=0.4$. Find $P(A | B)$.

Which of the following sets of atomic numbers corresponds to elements of group $16$?