Which of the following has the highest value of refractive index?

In a distillation column, bubble caps are located on trays with a pitch of ________ times the outside diameter of the caps?

Polymethyl methacrylate (PMMA) is known as ________?

Which is the most stable crystalline form of silica at room temperature?

Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of________?

If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to________?