Exams › JEE Main › Chemistry

Given below are two statements : Statement I : The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3. [Sc3+, Ti3+], [Mn2+, Cr2+], [Cu2+, Zn2+] and [Ni2+, Ti4+] Statement II : Th4+ is the strongest reducing agent among Th4+, Ce4+, Gd3+ and Eu2+. In the light of the above statements, choose the correct answer from the options given below

1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are false
4. Both Statement I and Statement II are true

Correct answer: Both Statement I and Statement II are false

Solution

Statement I is false because not all the listed ion pairs contain colored ions in aqueous solution; for example, Sc3+ and Zn2+ are colorless. Statement II is also false as Th4+ is not the strongest reducing agent among the given ions; in fact, Eu2+ is a stronger reducing agent.

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?
• When sodium nitroprusside is introduced into an alkaline solution containing sulphide ions, a purple-coloured ion is formed. This colour is due to the formation of which species?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →