MolSynapsequestion bank

MolSynapse / Question bank / Qualitative Analysis: Anions / Independent group: sulphate, phosphate, borate

NEET levelSingle correct optionDifficulty 1 of 3qa058

A borate salt is heated with ethanol and a few drops of concentrated sulphuric acid and the vapour is ignited. The flame is bordered by which colour?

AGolden yellow
BLilac
CCrimson red
DGreen

Answer: D

Boric acid formed from the borate esterifies with ethanol to give volatile triethyl borate,

B (OC X_{2} H X_{5}) X_{3}

. This burns with a green-edged flame, which is the standard test for borate.

Practice Qualitative Analysis: Anions More on Independent group: sulphate, phosphate, borate

Previous questionNext question

More questions on Independent group: sulphate, phosphate, borate