Which of the following represents the correct order of the acidity in the given compounds?

Filiform apparatus is a characteristic feature of

Explain the physical significance of Van der Waals parameters.

$A$ uniform cube of side $a$ and mass $m$ rests on a rough horizontal table. $A$ horizontal force $F$ is applied normal to one of the faces at a point that is directly above the centre of the face,at a height $\frac{3a}{4}$ above the base. The minimum value of $F$ for which the cube begins to tilt about the edge is (Assume that the cube does not slide):

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is

The radius of ${}_{52}Te^{125}$ nucleus is $6 \text{ fermi}$. The radius of ${}_{13}Al^{27}$ nucleus in meters is