Read the following and answer any four questions
Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.
Examples of Noble metals are:

Options

A. Gold
B. Silver
C. Platinum
D. All of the above

Answer

D

Explanation

The noble metals are a group of metals that resist oxidation and corrosion in moist air. The noble metals are not easily attacked by acids. Gold, silver and copper are noble metals.