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Chemistry
Chemical Bonding and Molecular Structure
Recommended PYQs (STRICTLY NCERT Based)
Octate, Isoelectronic Species, Lewis Structure & Formal Charge (10 Qs)

1(current)

Q. No.

Given the following five species:
$\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 $
The total number of these species that do not have eight electrons around the central atom in its/their outermost shell, is/are:

1.	1	2.	3
3.	2	4.	4

Q1:

58% From NCERT NEET - 2023

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Which pair of ions from the following list do not constitute an iso-electronic pair?

1. Mn²⁺, Fe³⁺

2. Fe²⁺, Mn²⁺

3. O^2–, F^–

4. Na⁺, Mg²⁺

Q2:

78% From NCERT NEET - 2021

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Which of the following pairs of ions are isoelectronic and isostructural?

1. ${CO}_{3}^{2 -},$ ${SO}_{3}^{2 -}$

2. ${ClO}_{3}^{-},$ ${CO}_{3}^{2 -}$

3. ${SO}_{3}^{2 -},$ ${NO}_{3}^{-}$

4. ${ClO}_{3}^{-},$ ${SO}_{3}^{2 -}$

Q3:

70% From NCERT NEET - 2015

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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An isostructural compound with XeF₂among the following is:
1. ICl₂^–
2. SbCl₃
3. BaCl₂
4. TeF₂

Q4:

79% From NCERT AIPMT - 2013

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Identify the wrong statement among the following.

1.	Amongst isoelectronic species, the smaller the positive charge on the cation, the smaller is the ionic radius
2.	Amongst isoelectronic species, the greater the negative charge on the anion, the larger is ionic radius
3.	Atomic radius of the elements increases as one moves down the first group of the periodic table
4.	Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table

Q5:

75% From NCERT AIPMT - 2012

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Among the following, iso-electronic species are:

1. CO₂, NO₂

2. $N O_{2}^{-}$ , CO₂

3. CN^–, CO

4. SO₂, CO₂

Q6:

84% From NCERT AIPMT - 2002

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Which of the following two species in the pair are isostructural:

1. $X e F_{2}$ $,$ $I F_{2}^{-}$

2. $N H_{3}$ $,$ $B F_{3}$

3. $C O_{3}^{- 2}$ $,$ $S O_{3}^{- 2}$

4. $P C l_{5}$ $,$ $I C I_{5}$

Q7:

85% From NCERT AIPMT - 2001

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Among the following, the compound that is electron deficient is:

1. BaCl₂

2. BCl₃

3. CCl₄

4. PCl₅

Q8:

84% From NCERT AIPMT - 2000

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Among the options given below, identify the Isoelectronic species:

1. CO, CN^–, NO⁺, C₂^2–

2. CO^–, CN, NO, C₂^–

3. CO⁺, CN⁺, NO^–, C₂

4. CO, CN, NO, C₂

Q9:

87% From NCERT AIPMT - 2000

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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In $P O_{4}^{- 3}$ , formal charge on every oxygen atom and P-O bond order respectively are:
1. -0.75 and 1.25
2. -0.5 and 2
3. 1 and 1.5
4. -0.75 and 2

Q10:

73% From NCERT AIPMT - 1998

Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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Living World
Biological Classification
Plant Kingdom
Morphology of Flowering Plants
Anatomy of Flowering Plants
Cell-unit of Life
Cell Cycle and Cell Division
Transport in Plants
Mineral Nutrition
Photosynthesis in Higher Plants
Respiration in Plants
Plant Growth and Development
Reproduction in Organisms
Sexual Reproduction in Flowering Plants
Principles of Inheritance and Variation
Molecular Basis of Inheritance
Strategies for Enhancement in Food Production
Microbes in Human Welfare
Organisms and Populations
Ecosystem
Biodiversity and Conservation
Environmental Issues

Chemistry Questions

Some Basic Concepts of Chemistry
Structure of Atom
Classification of Elements and Periodicity in Properties
Chemical Bonding and Molecular Structure
States of Matter
Thermodynamics
Equilibrium
Redox Reactions
Hydrogen
The s-Block Elements
The p-Block Elements-XI
Organic Chemistry - Some Basic Principles and Techniques
Hydrocarbons
Environmental Chemistry
The Solid State
Solutions
Electrochemistry
Chemical Kinetics
Surface Chemistry
General Principles and Processes of Isolation of Elements
The p-Block Elements-XII
The d and f Block Elements
Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids
Amines
Biomolecules
Polymers
Chemistry in Everyday Life

Physics Questions

Units and Measurement
Mathematical Tools
Motion in A Straight Line
Motion in A Plane
Laws of Motion
Work, Energy and Power
Systems of Particles and Rotational Motion
Gravitation
Mechanical Properties of Solids
Mechanical Properties of Fluids
Thermal Properties of Matter
Thermodynamics
Kinetic Theory of Gases
Oscillations
Waves
Electric Charges and Fields
Electrostatic Potential and Capacitance
Current Electricity
Moving Charges and Magnetism
Magnetism and Matter
Electromagnetic Induction
Alternating Current
Electromagnetic Waves
Ray Optics and Optical Instruments
Wave Optics
Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics

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Animal Kingdom
Structural Organisation in Animals
Biomolecules
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
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Locomotion and Movement
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Chemical Coordination and Integration
Human Reproduction
Reproductive Health
Evolution
Human Health and Disease
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