Match List I with List II

List I                                          List II

A. Zymase                                I. Stomach

B. Diastase                              II. Yeast

C. Urease                                 III. Malt

D. Pepsin                                  IV. Soyabean

Choose the correct answer form the options given below:

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)