Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET2004Chemistryd and f Block Elements

Which of the following pairs of ions are colourless?

Options

  1. ATi ³⁺, Cu ²⁺
  2. BSc ³⁺, Zn ²⁺
  3. CCo ²⁺, Fe ³⁺
  4. DNi ²⁺, V ³⁺

Correct answer

B. Sc ³⁺, Zn ²⁺

Step-by-step solution

Sc ³⁺=[ Ar ] 3 d^0, Zn ²⁺=[ Ar ] 3 s¹⁰ Both of these ions have no unpaired electron, hence these are colourless.

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Pick out the correct option Assertion(A): Mercury is not considered as a transition element Reason (R): Mercury is a liquid 2026Which of the following does not correctly represent the order of the property indicated against it? 2026The element with the highest third ionisation enthalpy is: 2026The product and its colour when MnO₂ is fused with KOH in presence of O₂ : 2026The ion that has a spin only magnetic moment of 5.9 BM is: 2026Which one of the following species will impart colour to an aqueous solution? 2026The basic character of transition metal monoxides follows the order: 2026K ₂ Cr ₂ O ₇ on heating with aqueous NaOH gives ------------------------- 2026 Full d and f Block Elements list All AP EAMCET PYQs