Three isomers A, B and C (mol. formula C₈H₁₁N) give the following results :
R has lower boiling point than S

A, B and C, respectively are :

100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?

A mixture of one mole each of H₂ , He and O₂ each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of H₂ is 2 atm, the total pressure of the gases in the cylinder is :

The d-electron configuration of [Ru(en)₃ ]Cl₂
and [Fe(H₂O)₆]Cl₂ , respectively are :