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#oxidation states

13 public questions tagged with this topic.

CHEMISTRY

Which of the following lanthanoids exhibits the +2 oxidation state due to a half-filled 4f subshell?

Given: Which of the following lanthanoids exhibits the +2 oxidation state due to a half-filled 4f subshell? These values define the system as per NCERT data. Formula: Eu (Z = 63) forms Eu^{2+ with 4f⁷, a stable half-filled configuration.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

Which of the following lanthanoids exhibits a +4 oxidation state due to its noble gas configuration?

Given: Which of the following lanthanoids exhibits a +4 oxidation state due to its noble gas configuration? These values define the system as per NCERT data. Formula: Cerium (Ce, Z = 58) forms Ce^{4+ with 4f⁰ (noble gas-like), making it stable in this state.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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Modern Periodic Law and Present Form - Long Form Periodic Table

Which group 16 element has the highest tendency to form stable compounds in the +4 oxidation state?

The +4 oxidation state is most stable for S in group 16, forming SO₂ (gaseous, strong S=O bonds), more stable than O₂, SeO₂ (polymeric), or TeO₂ (solid).

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table

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Electronic Configuration and Types of Elements - s p d f Blocks

Which of the following elements exhibits variable valency due to d-orbital involvement?

d-block elements exhibit variable valency due to partially filled d-orbitals. Cu (group 11) shows this, unlike Na (s-block), Al (p-block), or Kr (p-block, full).

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electronic Configuration and Types of Elements - s p d f Blocks

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