$BF_3$ is used as a catalyst in many industrial processes because of its .....

Despite being multicellular,its cells are not organized into tissues.

Which of the following compounds contains an $S - S$ bond?

$A$ photon collides with a stationary hydrogen atom in the ground state inelastically. The energy of the colliding photon is $10.2 \, eV$. After a time interval of the order of a microsecond,another photon collides with the same hydrogen atom inelastically with an energy of $15 \, eV$. What will be observed by the detector?

An open vessel at $300 \ K$ is heated until $2/5$ of the air in it has been expelled. Assuming the volume of the vessel remains constant,find the temperature to which the vessel has been heated in $K$.

Which of the following is an example of a neutral oxide?