Which of the following complexes will shows geometrical isomerism ?

Which of the following conversions involves change in both shape and hybridisation ?

In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively :

The mass of a non-volatile, non-electrolyte solute (molar mass = 50 g mol^-1 ) needed to be dissolved in 114 g octane to reduce its vapour pressure to 75%, is :