Graduate Pharmacy Aptitude Test (GPAT) 2012 Solved Paper

In amperometry, rotating platinum electrode (RPE) is used as indicating electrode. It has certain advantages as well as disadvantages. Read the following statements about the use of rotating platinum electrode in amperometry:
[P] : It causes large diffusion current due to rotation resulting in greater mass transfer
[Q] : It causes greatly reduced residual current due to lack of condenser effect
[R] : It has a low hydrogen over potential
Choose the correct combination of statements.