Identify the incorrect match.

Name IUPAC Official Name
a. Unnilunium (i) Mendelevium
b. Unniltrium (ii) Lawrecium
c. Unnilhexium (iii) Seaborgium
d. Unununnium (iv) Darmstadtium

1. (b), (ii)
2. (c), (iii)
3. (d), (iv)
4. (a), (i)

Subtopic:  Modern Periodic Table & Periodicity |
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Match the element in column I with that in column II.

Column-I Column-II
(a) Copper (i) Non-metal
(b) Fluorine (ii) Transition metal
(c) Silicon (iii) Lanthanoid
(d) Cerium (iv) Metalloid
 
(a) (b) (c) (d)
1. (ii) (iv) (i) (iii)
2. (ii) (i) (iv) (iii)
3. (iv) (iii) (i) (ii)
4. (i) (ii) (iii) (iv)
Subtopic:  Electronic Configuration |
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For the second period elements, the correct increasing order of first ionisation enthalpy is:

1.  Li<Be<B<C<O<N<F<Ne

2.  Li<Be<B<C<N<O<F<Ne

3.  Li<B<Be<C<O<N<F<Ne

4.  Li<B<Be<C<N<O<F<Ne

Subtopic:  Ionization Energy (IE) |
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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s22s22p3, the simplest formula for this compound is : 

1. Mg2X3

2. MgX2

3. Mg2X

4. Mg3X2

Subtopic:  Nature of Compound |
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In which of the following options, the order of arrangement does not agree with the variation of the property indicated against it?
1. B < C < N < O (increasing first ionisation enthalpy)
2. I < Br < F < Cl (increasing negative electron gain enthalpy)
3. Li < Na < K < Rb (increasing metallic radius)
4. Al3+ < Mg2+ < Na+ <F- (increasing ionic size)
Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
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The formation of the oxide ion O2- (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below, 
 Og+e-O-; fH0=-141 KJ mol-1O-g+e-O2-g; fH0=+780 KJ mol-1
Thus, process of formation of O2- in gas phase is unfavorable even though O2- is isoelectronic with neon. It is due to the fact that :
1. Electron repulsion outweighs the stability gained by achieving  noble gas configuration .
2. O- ion has comparatively smaller size than oxygen atom.
3. Oxygen is more electronegative.
4. Addition of electron in oxygen result in large size of the ion .

Subtopic:  Electron Affinity (EA) |
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The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?
1.  Ar < K< Ca2+
2. Ca2+ < Ar < K+
3. Ca2+ < K< Ar
4. K+ < Ar < Ca2+

Subtopic:  Atomic Size |
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Which of the following order of ionic radii is correctly represented?
1. H->H+>H 
2. Na+>F->O2-
3. F->O2->Na+
4. N3->Mg2+>Al3+

Subtopic:  Atomic Size |
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Be2+ is isoelectronic with which of the following ions?
1. H+
2. Li+
3. Na+
4. Mg2+

Subtopic:  Electronic Configuration |
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What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

1. + 10.2 eV 

2. –5.1 eV

3. –10.2 eV 

4. + 2.55 eV

Subtopic:  Electron Affinity (EA) |
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