JEE Main · 2021 · Shift-IImediumDNF-022

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

d & f-Block Elements · Class 12 · JEE Main Previous Year Question

Question

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

Options
  1. a

    Zn<Cu<Co<Fe<Cr\text{Zn} < \text{Cu} < \text{Co} < \text{Fe} < \text{Cr}

  2. b

    Cr<Zn<Co<Cu<Fe\text{Cr} < \text{Zn} < \text{Co} < \text{Cu} < \text{Fe}

  3. c

    Zn<Cr<Fe<Co<Cu\text{Zn} < \text{Cr} < \text{Fe} < \text{Co} < \text{Cu}

    ✓
  4. d

    Cr<Fe<Co<Cu<Zn\text{Cr} < \text{Fe} < \text{Co} < \text{Cu} < \text{Zn}

Correct Answerc

Zn<Cr<Fe<Co<Cu\text{Zn} < \text{Cr} < \text{Fe} < \text{Co} < \text{Cu}

Detailed Solution

Densities of first-row transition metals (g/cm³):

| Element | Density (g/cm³) | |---------|----------------| | Zn | 7.13 | | Cr | 7.19 | | Fe | 7.87 | | Co | 8.90 | | Cu | 8.96 |

Increasing order of density: Zn<Cr<Fe<Co<Cu\text{Zn} < \text{Cr} < \text{Fe} < \text{Co} < \text{Cu}

Answer: Option (3)

Practice this question with progress tracking

Want timed practice with adaptive difficulty? Solve this question (and hundreds more from d & f-Block Elements) inside The Crucible, our adaptive practice platform.

Practice in The Crucible →Browse d & f-Block Elements chapter →

More JEE Main d & f-Block Elements PYQs

2024easy

While preparing crystals of Mohr's salt, dil H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2SO4 is added here to :

2024medium

NaCl reacts with conc. H2SO4 and K2Cr2O7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are :

2024medium

In chromyl chloride test for confirmation of Cl- ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% H2O2 turns organic layer blue indicating…

2024easy

A and B formed in the following reactions are: CrO2Cl2 + 4NaOH A + 2NaCl + 2H2O A + 2HCl + 2H2O2 B + 3H2O

2024medium

Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured…

View all 111 d & f-Block Elements PYQs →
What is the correct order of the following elements with respect to their density? (JEE Main 2021) | Canvas Classes