Classification of Elements and Periodicity in Properties's Question 24 | Chemistry XI - Part 1 | NCERT Exemplar Questions

Physical Chemistry

Some Basic Concepts of Chemistry Structure of Atom States of Matter Thermodynamics Equilibrium

Inorganic Chemistry

Classification of Elements and Periodicity in Properties Chemical Bonding and Molecular Structure

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MCQ (Multiple Correct Answer)

In which of the following options order of arrangement does not agree with the variation of property indicated against it?

$\mathrm{AP}^{3+}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{F}^{-}$(Increasing ionic size)

$\mathrm{B}<\mathrm{C}<\mathrm{N}<\mathrm{O}$ ( Increasing first ionisation enthalpy)

$\mathrm{I}<\mathrm{Br}<\mathrm{Cl}<\mathrm{F}$ ( Increasing electron gain enthalpy)

$\mathrm{Li}<\mathrm{Na}<\mathrm{K}<\mathrm{Rb}$ ( Increasing metallic radius)

MCQ (Multiple Correct Answer)

Which of the following have no unit?

Electronegativity

Electron gain enthalpy

Ionisation enthalpy

Metallic character

MCQ (Multiple Correct Answer)

Ionic radii vary in

inverse proportion to the effective nuclear charge

inverse proportion to the square of effective nuclear charge

direct proportion to the screening effect

direct proportion to the square of screening effect

MCQ (Multiple Correct Answer)

An element belongs to 3rd period and group 13 of the periodic table. Which of the following properties will be shown by the element?

Good conductor of electricity

Liquid, metallic

Solid, metallic

Solid, non-metallic

Subjective

Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine?

Explanation

Electron gain enthalply of F is less negative than that of Cl because when an electron is added to $F$, the added electron goes to the smaller $n=2$ quantum level and suffers repulsion from other electrons present in this level.

In case of Cl , the added electron goes to the larger $n=3$ quantum level and suffers much less repulsion from other electrons.

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