The formation of the oxide ion O 2- (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below, O ( g ) + e - → O - ( g ) ; ∆ f H ° = - 141 kJmol - 1 O - ( g ) + e - → O 2 - ( g ) ; ∆ f H ° = + 780 kJ mol - 1 Thus, process of formation of O 2- in gas phase is unfavourable even though O 2- is isoelectronic with neon. It is due to the fact that

electron repulsion outweighs the stability gained by achieving noble gas configuration

O - ion has comparatively smaller size than oxygen atom

addition of electron in oxygen result in large size of the ion

Chemistry - Classification Elements Periodicity Properties - Quiz-4

In which of the following has maximum electronegativity:-

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C
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O
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B
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F

The electronic configuration of Palladium is:

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[Rn] 5f³ 6d¹ 7s²
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[Rn] 5f⁵ 6d¹ 7s²
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[Rn] 5f²6d¹ 7s²
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None of the above.

Z_eff of Na⁺ and Na⁰ are respectively-

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1.95 and 1.22
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0.85 and 0.35
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1 and 0.35
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6.85 and 2.2

Removal of 2^ndelectron is always :-

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Endothermic
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Endothermic for Mg, Be, N
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Exothermic for Mg, Be, N and noble gases
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Depends of electronic configuration

Atomic radius of Be, O, C, N, B are respectively (in pm) :-

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111, 66, 77, 74, 88
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74, 84, 111, 77,66
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111, 88, 77, 74, 66
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111, 66, 88, 77,74

The first four IP values of an element are 19, 190, 2000 and 2600 eV/atom. Element belongs to:-

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Amphoteric elements
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Four electron donor group
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s-block
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All of the above

A large difference between fifth and sixth ionisation energies indicate the element having :-

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15 proton in nucleus
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13 proton in nucleus
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11 proton in nucleus
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Ionisation energy is NOT related to number of proton in nucleus

If atomic number of an element of He-family is Z then which of the following atomic number will highest EA?

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Z - 2
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Z - 1
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Z + 1
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Z + 2

The element having very high electron affinity but zero ionisation enthalpy is :-

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He (due to inert gas configuration)
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Be (due to fully filled subshell)
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H (due to presence of allotropes)
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None of the above

The pair of which addition of 2^nd electron in both the atoms are endothermic :-

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All of the above
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N, Ne
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Be, F
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B, C

The correct order in which the O-O bond

length increases in the following is

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H₂O₂<O₂<O₃
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O₃<H₂O₂<O₂
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O₂<O₃<H₂O₂
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O₂<H₂O₂<O₃

The incorrect match among the following is -

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B < C < N < O (increasing first ionisation enthalpy)
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I < Br < F < Cl (increasing electron gain enthalpy)
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Li < Na < K < Rb (increasing metallic radius)
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Al³⁺ < Mg²⁺ < Na⁺ <F^- (increasing ionic size)

Which one of the following orders is correct for the bond dissociation enthalpy of halogen

molecules?

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Cl₂>Br₂>F₂>I₂
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Br₂>I₂>F₂>Cl₂
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F₂>Cl₂>Br₂>I₂
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I₂>Br₂>Cl₂>F₂

The correct sequence of increasing radii is -

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Ar < K⁺ < Ca²⁺
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Ca²⁺< Ar < K⁺
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Ca²⁺ < K⁺ < Ar
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K⁺< Ar < Ca²⁺

The formation of the oxide ion O^2-(g), from oxygen atom requires first an exothermic and

then an endothermic step as shown below,

$O (g) + e - \overset{}{\to} O^{-} (g); ∆_{f} H ° = - 141 {kJmol}^{- 1} O^{-} (g) + e^{-} \overset{}{\to} O^{2 -} (g); ∆_{f} H ° = + 780 kJ {mol}^{- 1}$

Thus, process of formation of O^2- in gas phase is unfavourable even though O^2- is

isoelectronic with neon. It is due to the fact that

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electron repulsion outweighs the stability gained by achieving noble gas configuration
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O^- ion has comparatively smaller size than oxygen atom
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Oxygen is more electronegative
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addition of electron in oxygen result in large size of the ion

Be²⁺ is isoelectronic with which of the following ions?

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H⁺
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Li⁺
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Na⁺
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Mg²⁺

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins

follows the order

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Li⁺<K⁺<Na⁺<Rb⁺
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Rb⁺<K⁺<Na⁺<Li⁺
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K⁺<Na⁺<Rb⁺<Li⁺
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Na⁺<Li⁺<K⁺<Rb⁺

The correct order of the decreasing ionic radii among the following isoelectronic species is :

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Ca²⁺ > K⁺ > S^2- > Cl^-
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Cl^- > S^2- > Ca²⁺ > K⁺
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S^2- > Cl^- > K⁺ > Ca²⁺
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K⁺ > Ca²⁺ > Cl^- > S^2-

The correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl is :

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Cl < F < O < S
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O < S < F < Cl
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F < S < O < Cl
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S < O < Cl < F

Which one of the following compounds is a peroxide ?

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KO₂
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BaO₂
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MnO₂
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NO₂

The sequence of ionic mobility in aqueous solution is

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K⁺>Na⁺>Rb⁺>Cs⁺
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Cs⁺>Rb⁺>K⁺>Na⁺
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Rb⁺>K⁺>Cs⁺>Na⁺
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Na⁺>K⁺>Rb⁺>Cs⁺

Which one of the following arrangements does not give the correct picture of the trends indicated against it?

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F₂> Cl₂> Br₂> I₂:Oxidising power
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F₂ < Cl₂ > Br₂ > I₂: Electron gain enthalpy
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F₂> Cl₂> Br₂> I₂: Bond dissociation energy
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F₂> Cl₂> Br₂> I₂: Electronegativity

Identify the correct order of the size of the following:

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Ca²⁺<K⁺<Ar<S^2-<Cl^-
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Ca²⁺<K⁺<Ar<Cl^-<S^2-
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Ar<Ca²⁺<K⁺<Cl^-<S^2-
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Ca²⁺<Ar<K⁺<Cl^-<S^2-

An element whose IUPAC name is Ununtrium (Uut) belongs to:

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s-Block elements
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p-Block elements
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d-Block elements
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Inner transition elements .

Which among the following is not a representative element?

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Tellurium
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Tantalum
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Thallium
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Astatine

The period number and group number of "Tantalum" (Z=73) are respectively :

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5, 7
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6, 13
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6, 5
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None of the above.

Consider the following electronic configuration of an element (P) :

$[Xe] 4 f^{14} 5 d^{1} 6 s^{2}$

The correct statement about element 'P' is :

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It belongs to the 6th period and the 1st group.
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It belongs to the 6th period and the 2nd group.
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It belongs to the 6th period and the 3rd group.
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None of the above.

Which of the following metal is highest electropositive (metallic) in nature ?

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Be
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Rb
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Mn
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Tl

The pair that has both members from the same period of the Periodic Table is

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Cl, Br
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Ca, Cl
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Na, Ca
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Na, Cl

Isoelectronic pair, among the following, is :

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${ClO}_{2}^{-}, {ClF}_{2}^{+}$
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${IF}_{2}^{-}, I_{3}^{-}$
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${Cl}_{2} O, {ICl}_{2}^{-}$
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${ICl}_{2}^{-}, {ClO}_{2}$

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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