AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) does not react with oxygen even at high temperatures
Gold is the least reactive metal. As stated in the textbook, "Silver and gold do not react with oxygen even at high temperatures," making gold chemically stable and ideal for jewellery.
Source: Chapter 3, Section 3.2.1
The key reason gold is used in jewellery is its chemical inertness — it does not tarnish or corrode. While gold is highly malleable and ductile, option (A) is factually incorrect (gold is the most ductile, but not the most malleable — gold and silver share top malleability). Silver and copper are better conductors than gold, ruling out (C). Option (D) is also false. Examiners expect you to recall the specific line about gold/silver not reacting with oxygen even at high temperatures.