Dimerisation of solute molecules in low dielectric constant solvent is due to

$1.7920 \ g$ of $K_2SO_4$ is present in $1000 \ mL$ of solution. If such solution has an osmotic pressure of $0.680 \ bar$ at $26 \ ^\circ C$,then find out the van't Hoff factor value.

During the determination of the molar mass of benzoic acid in benzene using the freezing point depression method,it corresponds to which of the following?

Phenol dimerised to $60\%$ in a solvent. The observed molecular weight of phenol will be

The values of observed and calculated molecular weight of silver nitrate are $90$ and $170$ respectively. The degree of dissociation of silver nitrate is ......... $\%$.

One mole of a solute $A$ is dissolved in a given volume of a solvent. The association of the solute takes place according to $nA \rightleftharpoons (A)_n$. The Van't Hoff factor $i$ is expressed as: