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NEET Questions
Chemistry
Classification of Elements and Periodicity in Properties
Recommended PYQs (STRICTLY NCERT Based)
Atomic Size (12 Qs)

1(current)
2

Q. No.

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is:

1. Be > Li > B > C
2. Li > Be > B > C
3. C > B > Be > Li
4. Li > C > Be > B

Q1:

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The element expected to form the largest ion to achieve the nearest noble gas configuration is:

1.	Na	2.	O
3.	F	4.	N

Q2:

53% From NCERT NEET - 2023

Subtopic: Atomic Size |

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Match List-I with List-II:

	List-I Elements		List-II Atomic radii (pm)
(a)	O	(i)	88
(b)	C	(ii)	74
(c)	B	(iii)	66
(d)	N	(iv)	77

Choose the correct answer from the options given below:

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

Q3:

71% From NCERT NEET - 2022

Subtopic: Atomic Size |

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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⁺

Q4:

83% From NCERT NEET - 2015

Subtopic: Atomic Size |

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The correct order of ionic radii is:

1. $H^{-} > H^{+} > H$
2. $N a^{+} > F^{-} > O^{2 -}$
3. $F^{-} > O^{2 -} > N a^{+}$
4. $N^{3 -} > M g^{2 +} > A l^{3 +}$

Q5:

81% From NCERT AIPMT - 2014

Subtopic: Atomic Size |

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

1. $C a^{2 +} > K^{+} > S^{2 -} > C l^{-}$

2. $C l^{-} > S^{2 -} > C a^{2 +} > K^{+}$

3. $S^{2 -} > C l^{-} > K^{+} > C a^{2 +}$

4. $K^{+} > C a^{2 +} > C l^{-} > S^{2 -}$

Q6:

88% From NCERT AIPMT - 2010

Subtopic: Atomic Size |

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Among the elements Ca, Mg, P and Cl, the correct order of increasing atomic radii is:
1. Cl < P < Mg < Ca
2. P < Cl < Ca < Mg
3. Ca < Mg < P < Cl
4. Mg < Ca < Cl < P

Q7:

79% From NCERT AIPMT - 2010

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Identify the correct order of the size of the following:

1. $C a^{2 +} < K^{+} < A r < S^{2 -} < C l^{-}$

2. $C a^{2 +} < K^{+} < A r < C l^{-} < S^{2 -}$

3. $A r < C a^{2 +} < K^{+} < C l^{-} < S^{2 -}$

4. $C a^{2 +} < A r^{+} < K^{+} < C l^{-} < S^{2 -}$

Q8:

83% From NCERT AIPMT - 2007

Subtopic: Atomic Size |

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Ionic radii are:

1.	Inversely proportional to the square of effective nuclear charge.
2.	Directly proportional to the effective nuclear charge.
3.	Directly proportional to the square of effective nuclear charge.
4.	Inversely proportional to the effective nuclear charge.

Q9:

72% From NCERT AIPMT - 2004

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The ions O^2–, F^–, Na⁺, Mg²⁺, and Al³⁺ are isoelectronic. Their ionic radii show:

1.	A significant increase from O^2– to Al³⁺.
2.	A significant decrease from O^2– to Al³⁺.
3.	An increase from O^2– to F^– and then a decrease from Na⁺ to Al³⁺.
4.	A decrease from O^2– to F^– and then an increase from Na⁺ to Al³⁺.

Q10:

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Living World
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Principles of Inheritance and Variation
Molecular Basis of Inheritance
Strategies for Enhancement in Food Production
Microbes in Human Welfare
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Biodiversity and Conservation
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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
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Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids
Amines
Biomolecules
Polymers
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Nuclei
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Animal Kingdom
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