Identify the hybridisation and geometry of $\mathrm{SF}_4$ molecule respectively.

Which from following buffers is used to maintain the pH of human blood naturally?

Identify the carbon atoms of glucose and of fructose forming glycosidic bond in sucrose.

Resistance and conductivity of a cell containing 0.1 M KCl solution at 298 K are 115 ohm and $1.90 \times 10^{-6} \mathrm{~S} \mathrm{~cm}^{-1}$ respectively. What is the value of cell constant?