Goldsmiths use borax while making gold jewelry. They heat t…

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published on: August 14, 2026

Goldsmiths use borax while making gold jewelry. They heat the mixture of a gold sample and borax on a flame, through which air is passed using a blow pipe because

heat and air convert the impurities into their oxides that react with molten borax forming a slag which can be separated from gold

gold oxide formed by heat and air gets reduced by borax to pure gold

air increases the heating temperature at which gold dissolves in borax, and on cooling gets recrystallised in pure form

borax reduces the hardness of gold at high temperature so that it can be stretched to form jewelry easily.

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