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Be and Mg have zero values of electron affinity because

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Important Questions on Classification of Elements and Periodicity in Properties

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

What is the correct oder of electron gain enthalpy of $Cl, F, Te, Po$

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

When the first electron gain enthalpy

({ΔH}_{eg})

of oxygen is

- 141 kJ / mol

, its second electron gain enthalpy is:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The correct order of first electron affinity of

O, S

and

Se

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

In which of the following, elements are arranged in the correct order of their electron gain enthalpies.

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The first electron affinity of

C, N

and

O

will be of the order

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

Arrange the following according to the instruction given in bracket:

$F, B, N, O$ (In the increasing order of electron affinity)

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The element with maximum bond-energy

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

In the following sets of reactants which two sets best exhibit the amphoteric character of Al₂O₃ . xH₂O ?

\begin{matrix} Set I & {Al}_{2} O_{3} \cdot {xH}_{2} O_{(s)} + {OH}_{(aq)}^{-} \\ Set II & {Al}_{2} O_{3} x \cdot H_{2} O_{(s)} + H_{2} O_{(l)} \\ Set III & {Al}_{2} O_{3} x \cdot H_{2} O_{(s)} + H_{(aq)}^{+} \\ Set IV & {Al}_{2} O_{3} \cdot {xH}_{2} O_{(s)} + {NH}_{3 (aq)} \end{matrix}

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na ⁺ will be :

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The absolute value of the electron gain enthalpy of halogens satisfies:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

For electron gain enthalpies of the elements denoted as

Δ_{eg} H

, the incorrect option is :

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

Which of the following reactions does not involve absorption of energy?

I. $O (g) + e^{-} ⟶ O^{-} (g)$

II. $S (g) + e^{-} ⟶ S^{-} (g)$

III. $O^{-} (g) + e^{-} ⟶ O^{2 -} (g)$

IV. $Cl (g) + e^{-} ⟶ {Cl}^{-} (g)$

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The difference between electron gain enthalpies will be maximum between :

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?

(A) $Rb$ and $Cs$

(B) $Na$ and $K$

(D) $I$ and $At$

Choose the correct answer from the options given below:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The formation of the oxide ion,

O^{2 -} (g)

, from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

O (g) + e^{-} ⟶ O^{-} (g); Δ_{f} H^{⊖} = - 141 k J m o l^{- 1}

O^{-} (g) + e^{-} ⟶ O^{2 -} (g); Δ_{f} H^{⊖} = + 780 k J m o l^{- 1}

Thus process of formation of

O^{2 -}

in gas phase is unfavourable though

O^{2 -}

is isoelectronic with neon. It is due to the fact that,

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

Which of the following orders of ionic radii is correctly represented?

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

The option(s) with only amphoteric oxides is(are):

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements?
a. Nitrogen
b. Phosphorous
c. Chlorine
d. Fluorine

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

Which of the following elements has the most negative electron gain enthalpy?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electron Gain Enthalpy and its Applications

Within each pair of elements

F

and

C l

S

and

S e

, and

Li

and

Na

, respectively, the elements that release more energy upon an electron gain are

Be and Mg have zero values of electron affinity because

Important Questions on Classification of Elements and Periodicity in Properties

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