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NEET CHEMISTRYClassification of Elements and Periodicity in PropertiesEasy

Question

Identify the incorrect match regarding the IUPAC Official Name of the element:

A

Unnilunium →\rightarrow Mendelevium

B

Unniltrium →\rightarrow Lawrencium

C

Unnilhexium →\rightarrow Seaborgium

D

Unununnium →\rightarrow Darmstadtium

Step-by-Step Solution

According to the IUPAC nomenclature for elements with atomic numbers > 100:

  1. Unnilunium corresponds to atomic number 101 (11 for un, 00 for nil, 11 for un). The official name is Mendelevium (Md). This match is correct.
  2. Unniltrium corresponds to atomic number 103 (11 for un, 00 for nil, 33 for tri). The official name is Lawrencium (Lr). This match is correct.
  3. Unnilhexium corresponds to atomic number 106 (11 for un, 00 for nil, 66 for hex). The official name is Seaborgium (Sg). This match is correct.
  4. Unununnium corresponds to atomic number 111 (11 for un, 11 for un, 11 for un). The official name is Roentgenium (Rg). Darmstadtium (Ds) corresponds to atomic number 110 (Ununnilium). Therefore, this match is incorrect.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Classification of Elements and Periodicity in Properties. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYClassification of Elements and Periodicity in Propertiesidentifyincorrectregardingofficialelement

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The correct sequence of increasing radii is:

A.Ar < K⁺ < Ca²⁺
B.Ca²⁺ < Ar < K⁺
C.Ca²⁺ < K⁺ < Ar
D.K⁺ < Ar < Ca²⁺
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Which one of the following represents all isoelectronic species?

A.Na⁺, Cl⁻, O⁻, NO⁺
B.N₂O, N₂O₄, NO⁺, NO
C.Na⁺, Mg²⁺, O⁻, F⁻
D.Ca²⁺, Ar, K⁺, Cl⁻
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The value of electron gain enthalpy of $Na^+$, if $IE_1$ of Na = 5.1 eV, is:

A.+10.2 eV
B.–5.1 eV
C.–10.2 eV
D.+2.55 eV
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Be²⁺ is isoelectronic with which of the following ions?

A.H⁺
B.Li⁺
C.Na⁺
D.Mg²⁺
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Identify the correct order of the size of the following species: $Ca^{2+}, K^+, Ar, S^{2-}, Cl^-$

A.$Ca^{2+} < K^+ < Ar < S^{2-} < Cl^-$
B.$Ca^{2+} < K^+ < Ar < Cl^- < S^{2-}$
C.$Ar < Ca^{2+} < K^+ < Cl^- < S^{2-}$
D.$Ca^{2+} < Ar < K^+ < Cl^- < S^{2-}$
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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: O(g) + e⁻ → O⁻(g); ΔH° = -141 kJ mol⁻¹ O⁻(g) + e⁻ → O²⁻(g); ΔH° = +780 kJ mol⁻¹ Thus, the process of formation of O²⁻ in gas phase is unfavourable even though O²⁻ is isoelectronic with neon. It is due to the fact that:

A.Electron repulsion outweighs the stability gained by achieving noble gas configuration
B.O⁻ ion has comparatively smaller size than oxygen atom
C.Oxygen is more electronegative
D.Addition of electron in oxygen result in large size of the ion
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A.Si < C < O < N < F
B.O < F < N < C < Si
C.F < O < N < C < Si
D.Si < C < N < O < F
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A.Cr > Mn > V > Ti
B.V > Mn > Cr > Ti
C.Mn > Cr > Ti > V
D.Ti > V > Cr > Mn
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