In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titraction mixture in this experiment?

Among the following species, the diamagnetic molecule is

The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are :

During compression of a spring the work done is 10kJ and 2kJ escaped to the surroundings as heat. The change in internal energy, $$\Delta $$U(inkJ) is :