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#group 17

10 public questions tagged with this topic.

CHEMISTRY

Which compound involves ionic bonding between a group 2 element and a group 17 element?

Given: Which compound involves ionic bonding between a group 2 element and a group 17 element? These values define the system as per NCERT data. Formula: MgCl₂ forms by electron transfer from magnesium (group 2) to chlorine (group 17), creating Mg²+ and Cl^- .. 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: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which compound involves the formation of an electrovalent bond between a group 1 and a group 17 element?

KF forms by electron transfer from potassium (group 1) to fluorine (group 17), creating K^+ and F^-, an ionic bond. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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Electron Gain Enthalpy and Electronegativity and Valency

Which group 17 element has the highest electron affinity despite not having the most negative electron gain enthalpy?

Electron affinity is the energy change for X + e⁻ -> X⁻. Cl has the highest electron affinity due to its balance of size and nuclear charge, though F’s electron gain enthalpy is less negative due to repulsion.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency

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Anomalous Properties and Second Period and Chemical Reactivity

Which group 17 element exhibits the least reactivity with hydrogen due to its bond strength?

Reactivity with hydrogen decreases down group 17 as H-X bond strength weakens. F forms the strongest H-F bond, making HF the least reactive among HF, HCl, HBr, and HI.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity

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