The D And F Block Elements

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Tanmay Shankar
T
Tanmay Shankar
Community Contributor
Quizzes Created: 491 | Total Attempts: 1,852,349
| Attempts: 1,748
SettingsSettings
Please wait...
  • 1/15 Questions

    Which of the following oxidation state is common for all lanthanoids?

    • + 2
    • + 3
    • + 4
    • + 5
Please wait...
The D And F Block Elements - Quiz
About This Quiz

This online test focuses on the d and f block elements, assessing knowledge on lanthanoids, interstitial compounds, reactions of transition metals, and properties of elements. It is designed for learners to understand advanced chemistry concepts and their practical applications.

Quiz Preview

  • 2. 

    Ammonium dichromate is used in fireworks. The green coloured powder blown in the air is:

    • CrO3

    • Cr2O3

    • Cr

    • CrO (O2

    Correct Answer
    A. Cr2O3
    Explanation
    Ammonium dichromate is used in fireworks to produce a green color. The correct answer, Cr2O3, is chromium(III) oxide, which is a green-colored powder.

    Rate this question:

  • 3. 

    Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?

    • They have high melting points in comparison to pure metals

    • They are very hard

    • They retain metallic conductivity

    • They are chemically very reactive

    Correct Answer
    A. They are chemically very reactive
    Explanation
    Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. They exhibit several characteristic properties such as high melting points, hardness, and retention of metallic conductivity. However, interstitial compounds are not chemically very reactive. This is because the trapped atoms do not easily participate in chemical reactions due to their tightly bound positions within the crystal lattice.

    Rate this question:

  • 4. 
    Metallic radii of some transition elements are given below. Which of these elements will have highest density?    - ProProfs

    Metallic radii of some transition elements are given below. Which of these elements will have highest density?   

    • Fe

    • Ni

    • Co

    • Cu

    Correct Answer
    A. Cu
    Explanation
    Copper (Cu) will have the highest density among the given transition elements. This is because density is directly proportional to atomic mass and inversely proportional to atomic radius. Cu has the highest atomic mass among Fe, Ni, Co, and Cu. Additionally, Cu has a smaller atomic radius compared to the other elements, which further contributes to its higher density.

    Rate this question:

  • 5. 

    Lanthanoid contraction is observed in:

    • Gd

    • At

    • Xe

    • Ac

    Correct Answer
    A. Gd
    Explanation
    Lanthanoid contraction refers to the decrease in atomic and ionic radii of elements in the lanthanoid series as the atomic number increases. Gd (Gadolinium) is an element in the lanthanoid series, and therefore, it exhibits the phenomenon of lanthanoid contraction.

    Rate this question:

  • 6. 

    A transition metal exists in its highest oxidation state. It is expected to behave as:

    • A chelating agent

    • A central metal in a coordination compound

    • An oxidizing agent

    • A reducing agent

    Correct Answer
    A. An oxidizing agent
    Explanation
    A transition metal in its highest oxidation state has a high affinity for electrons and tends to gain electrons from other substances. This makes it an excellent oxidizing agent as it can easily accept electrons and cause other substances to lose electrons, resulting in oxidation reactions.

    Rate this question:

  • 7. 

    All Cu (II) halidesknown except iodide. The reason for this is that:

    • Iodide ion is a bulky ion

    • Cu2+ oxidizes iodide to iodine

    • Cu2+ (aq.) has much more negative hydration enthalpy

    • Cu2+ ion has smaller size

    Correct Answer
    A. Cu2+ oxidizes iodide to iodine
    Explanation
    Cu2+ oxidizes iodide to iodine because Cu2+ is a strong oxidizing agent. It has a high tendency to gain electrons and undergo reduction reactions. In the presence of iodide ions, Cu2+ can easily accept electrons from iodide and convert it into iodine. This reaction is favored because iodine has a lower oxidation state compared to iodide. Therefore, Cu2+ oxidizes iodide to iodine.

    Rate this question:

  • 8. 

    The actinoid exhibit more number of oxidation states in general than the lanthanoids. This is because:

    • The 5f orbitals extend farther from the nucleus than the 4f orbitals

    • The 5f orbitals are more buried than the 4f orbitals

    • There is a similarity between the 4f and 5f orbitals in their angular part of the wave function

    • The actinoids are more reactive than the lanthanoids

    Correct Answer
    A. The 5f orbitals extend farther from the nucleus than the 4f orbitals
    Explanation
    The answer is the 5f orbitals extend farther from the nucleus than the 4f orbitals. This is because the distance of an electron from the nucleus determines its energy level and reactivity. The farther an electron is from the nucleus, the higher its energy level and the more easily it can participate in chemical reactions. Since the actinoids have electrons in the 5f orbitals, which are farther from the nucleus than the 4f orbitals of the lanthanoids, they can exhibit a greater number of oxidation states and are therefore more reactive.

    Rate this question:

  • 9. 

    For successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?

    • Cr > Mn > Co > Fe

    • Mn > Fe > Cr > Co

    • Fe > Mn > Co > Cr

    • Co > Mn > Fe > Cr

    Correct Answer
    A. Mn > Fe > Cr > Co
    Explanation
    The stability of the +2 oxidation state for the successive transition elements follows the order Mn > Fe > Cr > Co. This means that Mn has the highest stability for the +2 oxidation state, followed by Fe, Cr, and then Co.

    Rate this question:

  • 10. 

    A student accidently added conc. H2SO4 to potassium permagnate and it exploded due to the formation of an explosive which is:

    • MnO

    • Mn2O3

    • Mn2O5

    • Mn2O7

    Correct Answer
    A. Mn2O7
    Explanation
    When concentrated sulfuric acid (H2SO4) is added to potassium permanganate (KMnO4), it reacts to form manganese heptoxide (Mn2O7). Manganese heptoxide is a highly explosive compound, which explains why the mixture exploded.

    Rate this question:

  • 11. 

    KMnO4 acts an oxidizing agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidesed to:

    Correct Answer
    A.
  • 12. 

    When acidified K2Cr2O7 solution is added to Sn2+ salts, then Sn2+ changes to:

    • Sn

    • Sn3+

    • Sn4+v

    • Sn+

    Correct Answer
    A. Sn4+v
    Explanation
    When acidified K2Cr2O7 solution is added to Sn2+ salts, the Sn2+ ions are oxidized to Sn4+ ions. This is because K2Cr2O7 is a strong oxidizing agent and can transfer oxygen atoms to Sn2+ ions, resulting in the formation of Sn4+ ions.

    Rate this question:

  • 13. 

    The colour of light absorbed by an aqueous solution of CuSO4 is

    • Orange-red

    • Blue-green

    • Yellow

    • Violet

    Correct Answer
    A. Orange-red
    Explanation
    An aqueous solution of CuSO4 absorbs light in the orange-red region of the electromagnetic spectrum. This is because when light passes through the solution, the Cu2+ ions present in the solution absorb photons of light that have energies corresponding to the orange-red wavelength range. This absorption occurs due to the electronic transitions within the Cu2+ ions. As a result, the solution appears orange-red in color.

    Rate this question:

  • 14. 

    Which of the following lanthanoid ion is paramagnetic?

    • Ce4+

    • Option 2Yb2+

    • Lu3+

    • 4Eu2+

    Correct Answer
    A. 4Eu2+
    Explanation
    Eu2+ is paramagnetic because it has an unpaired electron. Paramagnetic substances are attracted to a magnetic field due to the presence of unpaired electrons, which creates a net magnetic moment. Ce4+, Yb2+, and Lu3+ do not have unpaired electrons and are therefore diamagnetic.

    Rate this question:

  • 15. 

    When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to the formation of:

    Correct Answer
    A.
    Explanation
    When hydrogen peroxide is added to acidified potassium dichromate, a blue color is produced due to the formation of chromium(III) ions. The reaction involves the reduction of the orange dichromate ions (Cr2O7^2-) to green chromium(III) ions (Cr^3+). This reduction reaction is facilitated by the oxidizing agent hydrogen peroxide. The blue color observed is due to the presence of the chromium(III) ions in solution.

    Rate this question:

Quiz Review Timeline (Updated): Mar 18, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 18, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 18, 2013
    Quiz Created by
    Tanmay Shankar
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.