NEET 2025 Level Classification of Elements and Periodicity in Properties Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

In Mendeleev's periodic table, a number of series and groups are X and Y respectively. X and Y are:

1. X=12, Y=9
2. X=8, Y=9
3. X=8, Y=8
4. X=12, Y=8

Q2:

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Subtopic: Evolution of Periodic Table |

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The incorrect match among the following options is :

1. $[Ar] 3 d^{5} 4 s^{1} \to$ $4^{th}$ $period,$ $6^{th}$ $group$

2. $[Kr] 4 d^{10} \to$ $5^{th}$ $period,$ $12^{th}$ $group$

3. $[Rn] 6 d^{2} 7 s^{2} \to$ $7^{th}$ $period,$ $3^{th}$ $group$

4. $[Xe] 4 f^{14} 5 d^{2} 6 s^{2} \to$ $6^{th}$ $period,$ $4^{th}$ $group$

Q3:

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Subtopic: Electronic Configuration |

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The element having electronic configuration [Kr]4d¹⁰4f¹⁴, 5s²5p⁶, 6s² belongs to:

1. s-block

2. p-block

3. d-block

4. f-block

Q4:

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Subtopic: Electronic Configuration |

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The correct electronic configuration of an element that is just above the 4^th period and belongs to the 16^th group:

1. 4s²3d¹⁰4p⁴

2. 2s²2p⁴

3. 3s²3p⁴

4. 5s²5d¹⁰4p⁴

Q5:

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Subtopic: Electronic Configuration |

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Which of the following options shows an incorrect order of ionic radii?

1. Sr²⁺<Rb⁺<Br^-<Se^2-

2. Nb⁵⁺<Zr⁴⁺<Y³⁺

3. Co>Co²⁺>Co³⁺>Co⁴⁺

4. Ba²⁺>Cs⁺<Se^2-<As^3-

Q6:

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Subtopic: Atomic Size |

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Which of the following pairs has the most significant size variation?

1.	Na and Na⁺	2.	Na and K
3.	Cl and Cl^–	4.	Mg and Mg⁺

Q7:

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Subtopic: Atomic Size |

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Given below are pair of species. Which pair has the largest difference in sizes?

1.	Na and K	2.	K and K⁺
3.	Cl and Cl^-	4.	Cl and Br

Q8:

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Subtopic: Atomic Size |

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Assertion (A)	The helium atom has the highest ionization energy among all the elements.
Reason (R):	Helium is the smallest atom among all the elements.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

Q9:

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Subtopic: Ionization Energy (IE) |

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Which is the correct order of ionization energies?

1. F^- > F > Cl^-> Cl

2. F > Cl > Cl^-> F^-

3. F^- > Cl^- > Cl > F

4. F^- > Cl^- > F > Cl

Q10:

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Subtopic: Ionization Energy (IE) |

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