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#ionization enthalpy

30 public questions tagged with this topic.

CHEMISTRY

Arrange the following in order of increasing ionization enthalpy: Be, B, Li.

Li (lowest, ns¹) < B (3p electron removed) < Be (highest, stable 2s²) due to stability and nuclear charge effects. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Electrochemistry (Latest NCERT 2026-27), Topic: Faraday's laws, charge required to reduce Al³⁺, 3F = 3 × 96500 C

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CHEMISTRY

Which of the following 3d series elements has the highest second ionization enthalpy?

Given: Which of the following 3d series elements has the highest second ionization enthalpy? Formula: Copper (Cu, Z = 29) has the highest second ionization enthalpy (1958 kJ/mol) due to the stability of 3d^{10 after losing one 4s electron.. Substitution: Substituting given values into formula as per NCERT 2026-27 method. Calculation: Simplifying step by step with proper SI units like m/s², J kg⁻¹ K⁻¹, 10⁻⁵, A m⁻¹ etc. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which element in the fourth period has the highest third ionization enthalpy?

Third ionization enthalpy peaks when removing an electron from a noble gas-like X²⁺ ion. Ca (after losing two electrons, becomes Ca²⁺ with 1s² 2s² 2p⁶ 3s² 3p⁶) has the highest value.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which element in the fourth period has the highest fourth ionization enthalpy?

Fourth ionization enthalpy peaks when removing an electron from a stable X³⁺ ion. Si (after losing three electrons, becomes Si³⁺ with 1s² 2s² 2p⁶) has the highest value.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which element in the fifth period has the highest third ionization enthalpy?

Third ionization enthalpy peaks when removing an electron from a noble gas-like X²⁺ ion. Sr (after losing two electrons, becomes Sr²⁺ with 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶) has the highest value in period 5.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which of the following has the highest first ionization enthalpy among the third period elements?

First ionization enthalpy increases across a period. Among Na, Mg, Si, and Ar, Ar (group 18, period 3) has the highest value due to its stable noble gas configuration.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which element in group 14 has the highest ionization enthalpy after losing three electrons?

Fourth ionization enthalpy is highest for C (removing an electron from C³⁺ with 1s²) due to its small size and stable configuration, compared to Si, Ge, or Sn.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which element in the fourth period has the highest fifth ionization enthalpy?

Fifth ionization enthalpy peaks when removing an electron from a stable X⁴⁺ ion. P (after losing four electrons, becomes P⁴⁺ with 1s² 2s² 2p⁶) has the highest value in period 4.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which element has the highest third ionization enthalpy among the following?

Third ionization enthalpy is highest when removing an electron from a noble gas-like configuration. Mg (after losing two electrons, becomes Mg²⁺ with 1s² 2s² 2p⁶) has the highest value.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which pair of elements from the same group shows the smallest difference in first ionization enthalpy?

In group 13, Ga and In have a smaller ionization enthalpy difference due to d-block contraction effects, unlike B-Al, where the drop is larger due to a new shell.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

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