The incorrect statement among the following is
The incorrect statement among the following is
Actinoids are highly reactive metals, especially when finely divided
Actinoid contraction is greater for element-to-element than Lanthanoid contraction.
Most of the trivalent Lanthanoid ions are colorless in the solid state.
Lanthanoids are good conductors of heat and electricity
The Correct Option is A
Solution and Explanation
The correct answer is option (A) : Actinoids are highly reactive metals, especially when finely divided
Top Questions on The Actinoids
- Actinoid contraction is of greater extent then lanthanide contraction because :
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Questions Asked in NEET exam
- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector \(\vec{P}\) of magnitude, 4 × 10-6 C m, is ± 9 × 103 V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :- NEET (UG) - 2024
- Magnetic Field
- Given below are two statements:
Statement I: Mitochondria and chloroplasts both double membranes bound organelles.
Statement II: Inner membrane of mitochondria is relatively less permeable, as compared chloroplast. I
In the light of the above statements, choose the mis appropriate answer from the options given below- NEET (UG) - 2024
- Cell structure and organelles
- Match List I with List II:Choose the correct answer from the options given below:
List I
List II
A Mesozoic Era I Lower invertebrates B Proterozoic Era II Fish & Amphibia C Cenozoic Era III Birds & Reptiles D Paleozoic Era IV Mammals - NEET (UG) - 2024
- Origin Of Life
- A parallel plate capacitor is charged by connecting it to a battery through a resistor. If I is the current in the circuit, then in the gap between the plates :
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- The terminal voltage of the battery, whose emf is\(10V\) and internal resistance \(1\), when connected through an external resistance of \(42\) as shown in the figure is:
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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.