PCl₅(g) -> PCl₃ (g) + Cl₂(g)

In the above first order reaction, the concentration of PCl₅ reduces from initial concentration 50mol L^-1 to mol L^-1 in 120 minutes at 300K. The rate constant for the reaction at 300K is x * 10^-2 min^-1. the value of x is_________.

[Given log5 = 0.6989]

At 25°C the standard emf of cell having reactions involving two electrons change is found to be 0.295 V. The equilibrium constant of the reaction is :

Kindly consider the following 

Which of the following will not give ether as product :-

Which is most reactive towards electrophilic aromatic substitution reaction :-

Which one of the following ions is the most stable in aqueous solution ?

(At. No. Ti = 22, V = 23, Cr = 24, Mn=25)