The Number of statement(s) correct from the following for Copper (At no. 29) is / are__________.

(a) Cu(II) complexes are always paramagnetic

(b) Cu(I) complexes are generally colourless

(c) Cu(I) is easily oxidized

(d) In Fehling solution, the active re agent has Cu(I)

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)