Indian Forest Service (Mains), Chemistry optional · 2021 · Paper I
Q3(c). Ion-selective and glass electrodes
Question
What are ion-selective electrodes? How can glass electrode be used to determine the pH of a given solution?
Model answer
The free solution for 2021 answers questions 1, 2, 4, 5 and 6, the ones picked in its time plan. Question 3 is answered in full in the IFoS Chemistry Paper I, 2021 to 2025 book, with every part of every paper.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
Printed copy and Kindle
UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Physical chemistry numericals worked with units; inorganic structures drawn
- Topic-wise weightage and a topic-wise index
Coversion-selective electrodeglass electrodepH measurementmembrane potentialpotentiometry
All parts of Question 3
- 3(a) Maximum low-pressure slope of Z10 marks
- 3(b) Temperature and decomposition of silver oxide15 marks
- 3(c) Ion-selective and glass electrodes15 marks