During explosion of gunpowder, which of the following gases are evolved in the proportion of 1 : 3?

The metal constituent of chlorophyll is

The reaction that takes place in soap making is called saponification. Basically soap is sodium or potassium salts of

When a copper rod is dipped in aqueous silver nitrate solution, the colour of the solution changes to blue. This is because

The image formed by a convex mirror of a real object is larger than the object

Match List 1 with List 2 and select the correct answer using the code given below the lists :