Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202124 Feb 2021Evening ShiftChemistryd and f Block ElementsActual

What is the correct order of the following elements with respect to their density?

Options

  1. AZn < Cu < Co < Fe < Cr
  2. BCr < Zn < Co < Cu < Fe
  3. CZn < Cr < Fe < Co < Cu
  4. DCr < Fe < Co < Cu < Zn

Correct answer

C. Zn < Cr < Fe < Co < Cu

Step-by-step solution

Among the transition series, the trend in density will be reverse of atomic radii, i.e. density increase remains almost the same and then decreases along the period.

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Given below are two statements: Statement I: The number of pairs among [ Ti ⁴⁺, V ²⁺] , [ V ²⁺, Mn ²⁺] , [ Mn ²⁺, Fe ³⁺] and [ V ²⁺, Cr ²⁺] in which both ions are coloured is 3 . S 2026Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for 2026The correct order of first ( _i H₁) and second ( _i H₂) ionisation enthalpy values of Cr and Mn are : A. _i H₁ : Cr > Mn B. _i H₂ : Cr > Mn C. _i H₁ : Mn > Cr D. _i H₂ : Mn > Cr Ch 2026The correct statements among the following are. A. Basic vanadium oxide is used in the manufacture of H ₂ SO ₄ . B. The spin-only magnetic moment value of the transition metal hali 2026Given below are two statements : Statement I: Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement 2026A paper dipped in a dil. H₂SO₄ solution of ' X ' upon treatment with SO₂ gas turns into green. The compound ' X ' is : 2026Which of the following is NOT a physical or chemical characteristics of interstitial compounds? 2026Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy 2026 Full d and f Block Elements list All JEE Main PYQs