Choose the correct answers. - \(Mn_2O_7 \) is a oil at room temperature.
- \(V_2O_4\) react with acid to give \(VO^{2+}\).
- \(CrO\) is a basic oxide.
- \(V_2O_5\) does not react with acids.
- \(Mn_2O_7 \) is a oil at room temperature.
- \(V_2O_4\) react with acid to give \(VO^{2+}\).
- \(CrO\) is a basic oxide.
- \(V_2O_5\) does not react with acids.
- A, B and C only
- B, C and D only
- A only
- B and C only
The Correct Option is A
Solution and Explanation
Top Questions on Some Applications of d- and f-Block Elements
- Give explanation for each of the following observations:
(a) With the same d$^8$ orbital configuration, Mn$^{2+}$ ion is an oxidizing agent whereas Cr$^{2+}$ ion is a reducing agent.
(b) Atomic contraction is greater from element to element than much from lanthanides.
(c) Transition metals form large number of interstitial compounds with H, B, C, and N.- CBSE CLASS XII - 2025
- Chemistry
- Some Applications of d- and f-Block Elements
- Assertion (A): Cuprous salts are diamagnetic.
Reason (R): Cuprous ion has completely filled 3d-orbitals.- CBSE CLASS XII - 2025
- Chemistry
- Some Applications of d- and f-Block Elements
- Out of Fe$^{3+}$, Sc$^{3+}$, Cr$^{3+}$ and Co$^{3+}$ ions, the one which is colourless in aqueous solution is:
- CBSE CLASS XII - 2025
- Chemistry
- Some Applications of d- and f-Block Elements
- Examine the following observations: (a) Transition elements generally form coloured compounds.
(b) Zinc is not regarded as a transition element.- CBSE CLASS XII - 2025
- Chemistry
- Some Applications of d- and f-Block Elements
- The element having [Ar]$3d^{10}4s^1$ electronic configuration is
- CBSE CLASS XII - 2025
- Chemistry
- Some Applications of d- and f-Block Elements
Questions Asked in JEE Main exam
Consider a solution of CO$_2$(g) dissolved in water in a closed container. Which one of the following plots correctly represents variation of $\log$ (partial pressure of CO$_2$ in vapour phase above water) [y-axis] with $\log$ (mole fraction of CO$_2$ in water) [x-axis] at
$25^\circ$C?
- JEE Main - 2026
- Buffer Solutions
- A thin convex lens of focal length \( 5 \) cm and a thin concave lens of focal length \( 4 \) cm are combined together (without any gap), and this combination has magnification \( m_1 \) when an object is placed \( 10 \) cm before the convex lens.
Keeping the positions of the convex lens and the object undisturbed, a gap of \( 1 \) cm is introduced between the lenses by moving the concave lens away. This leads to a change in magnification of the total lens system to \( m_2 \).
The value of \( \dfrac{m_1}{m_2} \) is
Three long straight wires carrying current are arranged mutually parallel as shown in the figure. The force experienced by \(15\) cm length of wire \(Q\) is ________. (\( \mu_0 = 4\pi \times 10^{-7}\,\text{T m A}^{-1} \))
- JEE Main - 2026
- Magnetic Effects of Current and Magnetism
Two circular discs of radius \(10\) cm each are joined at their centres by a rod, as shown in the figure. The length of the rod is \(30\) cm and its mass is \(600\) g. The mass of each disc is also \(600\) g. If the applied torque between the two discs is \(43\times10^{-7}\) dyne·cm, then the angular acceleration of the system about the given axis \(AB\) is ________ rad s\(^{-2}\).
- JEE Main - 2026
- Rotational motion
Which of the following best represents the temperature versus heat supplied graph for water, in the range of \(-20^\circ\text{C}\) to \(120^\circ\text{C}\)?
- JEE Main - 2026
- Thermodynamics
Concepts Used:
Applications of d and f block elements
The d-block and f-block elements of the periodic table have a wide range of applications in various fields due to their unique chemical and physical properties.
One of the most important applications of d-block elements is in the field of metallurgy. Many d-block elements, such as iron, copper, and nickel, are widely used in the production of steel, alloys, and other metals. These elements are also used in the construction of electrical wires, electronic devices, and machinery due to their high thermal and electrical conductivity.
F-block elements have unique optical and magnetic properties that make them useful in a variety of applications. For example, neodymium and samarium are used in the production of high-strength magnets for use in computer hard drives, speakers, and medical equipment. Lanthanum and gadolinium are used in the production of camera lenses, optical fibers, and x-ray screens.
D-block elements are also used in catalysis, a process that accelerates chemical reactions without being consumed in the process. These elements are used as catalysts in many industrial processes, such as the production of fertilizers, plastics, and fuels.
F-block elements also find applications in nuclear power generation, as some isotopes of actinides are used in nuclear reactors for electricity generation.
Overall, the d-block and f-block elements have a wide range of applications in various fields, including metallurgy, electronics, optics, catalysis, and energy production. The unique properties of these elements make them crucial components of many modern technologies.