Among the gases (a) - (e), the gases that cause greenhouse effect are :

a) ${\mathrm{C}\mathrm{O}}_2$

b) ${\mathrm{H}}_2\mathrm{O}$

c) $\mathrm{C}\mathrm{F}\mathrm{C}\mathrm{s}$

d) ${\mathrm{O}}_2$

 

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)