Exams › JEE Main › Chemistry

A metal M is unattacked by strong acids such as concentrated HNO3 and concentrated H2SO4 and by concentrated alkali solutions like NaOH and KOH. It forms a trichloride MCl3 that is used as a toning agent in photography. Identify the metal M.

1. Ag
2. Hg
3. Au
4. Cu

Correct answer: Au

Solution

Gold is a noble metal not attacked by individual concentrated acids or alkalies, and AuCl3 (gold(III) chloride) is used for toning photographic prints.

Related JEE Main Chemistry questions

• A transition metal M gives a volatile chloride whose vapour density is 94.8. If this chloride contains 74.75% chlorine by mass, what is the formula of the metal chloride?
• What is the ratio of the magnetic moments of Fe(III) and Co(II)?
• Which of the following species contains the greatest number of unpaired electrons?
• Which of the following species contains an atom in the +6 oxidation state?
• Which of the following pairs contains compounds in which the metal in each case is present in its maximum possible oxidation state?
• Among the following metal oxides, which one exhibits antiferromagnetic behavior?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →