MEDIUM

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Explain why aluminium has a lower first ionisation energy than magnesium.

Important Questions on Classification of Elements and Periodicity in Properties

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

Among the element Li, N, C and Be, one with the largest atomic radius is

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

Which of the following represents the correct order of increasing first ionization enthalpy for

Ca, Ba, S, Se and Ar

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The first ionization enthalpies for three elements are

1314, 1680

and

2080 kJ {mol}^{- 1}

, respectively. The correct sequence of the element is:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

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>Periodic Trends in the Properties of Elements

When the first electron gain enthalpy

({ΔH}_{eg})

of oxygen is

- 141 kJ / mol

, its second electron gain enthalpy is:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The electronic configuration of an element with the largest difference between the

1^{s t}

and

2^{n d}

ionization energies is

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The species

A r, K^{+}

and

C a^{2 +}

contain the same number of electrons. In which order do their radii increase?

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

Give a reason for the following.

Ionisation potential increases across a period, from left to right.

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The correct order of atomic radii is:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

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>Periodic Trends in the Properties of Elements

Which one of the following has largest ionic radius ?

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

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

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

Which of the following atoms has the highest first ionization energy?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The electronic configuration with the highest ionization enthalpy is:

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

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

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

For the second period elements the correct increasing order of first ionization enthalpy is:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The element having the greatest difference between its first and second ionization energies, is

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

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

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

Among the following, the correct order of acidity is:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodic Trends in the Properties of Elements

The ionic radii

(in Å)

N^{3 -}, O^{2 -}

and

F^{-}

are respectively:

Explain why aluminium has a lower first ionisation energy than magnesium.

Important Questions on Classification of Elements and Periodicity in Properties

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