alleryWhy must a KMnO4 burette have a glass stopcock?
ARubber absorbs the water
BGlass gives clearer readings
CRubber is oxidised by permanganate
DGlass speeds up the reaction
Answer & Solution
Correct answer: C. Rubber is oxidised by permanganate
Permanganate oxidises rubber, which would spoil both the tube and the titrant.
Keep practising Principles Related to Practical Chemistry
Browse all Principles Related to Practical Chemistry questions for NEET UG, or explore more Chemistry topics.
Related questions
At what temperature is aniline diazotised in the azo dye test?In the azo dye test, benzenediazonium chloride couples with beta-naphthol to give:How is the toxic carbylamine destroyed after the test?Which amines give the carbylamine test with chloroform and alcoholic KOH?A carboxylic acid warmed with ethanol and conc. H2SO4 gives a sweet smell due to:What is seen when a carboxylic acid is added to sodium hydrogencarbonate solution?After a Tollens' test, the silver mirror is removed by adding:What forms inside the test tube in a positive Tollens' test?