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NEET Exam  >  NEET Test  >  NCERT Based Tests  >  Assertion & Reason Test: Classification of Elements & Periodicity in Properties - NEET MCQ

Classification of Elements & Periodicity in Properties - Free Assertion


MCQ Practice Test & Solutions: Assertion & Reason Test: Classification of Elements & Periodicity in Properties (10 Questions)

You can prepare effectively for NEET NCERT Based Tests for NEET with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Assertion & Reason Test: Classification of Elements & Periodicity in Properties ". These 10 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 10

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Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 1
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Atomic number of the element ununbium is 112.

Reason (R): Name for digits 1 and 2 is un- and bi-respectively in latin words.

Detailed Solution: Question 1

Both A and R are true and R is the correct explanation of A.
112     1-un 1-un 2-bi   so ununbium

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 2
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Second ionization enthalpy will be higher the first ionization enthalpy.

Reason (R): Ionization enthalpy is a quantitative measure of the tendency of an element to lose electron.

Detailed Solution: Question 2

Second ionisation enthalpy is the energy required to remove a second electron from 1 mole of gaseous 1+ ions to give gaseous 2+ gives.

Second ionisation energy is greater than first ionisation energy because after removal of first electrons, the nuclear charge increases and electrons are held more tightly by the nucleus. This is makes the removal of second electrons difficult and hence requires more energy.

Both assertion and reason are true but reason is not the correct explanation of assertion. It is difficult to remove an electron from a positively charged ion than a neutral atom.

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Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 3
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Second period consists of 8 elements.

Reason (R): Number of elements in each period is four times the number of atomic orbitals available in the energy level that is being filled.

Detailed Solution: Question 3

Number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled.

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 4
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Alkali metals have least value of ionization energy within a period.

Reason (B): They precede alkaline earth metals in periodic table.

Detailed Solution: Question 4

Both assertion and reason are true but reason is not the correct explanation of assertion. Alkali metals belong to first group and have largest size in a period and hence low I.E.

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 5
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): In a triad, the three elements present have same gaps of atomic masses.

Reason (R): Elements in a triad have similar properties.

Detailed Solution: Question 5

In the dobereiner's triads, the three elements are grouped together in such a way that the atomic mass of the middle element is the mean of the first and last element.

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 6
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Atomic size decreases in a period due to increase of atomic number.

Reason (R): The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, the atomic size of the element decreases from left to right.

Detailed Solution: Question 6

The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, due to increased effective nuclear charge, the atomic size of the element decreases from left to right.

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 7
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Helium is placed in group 18 along with p-block elements.

Reason (R): It shows properties similar to p-block elements.

Detailed Solution: Question 7

He (1s2) should be placed along with s-block elements because of its electronic configuration but it has a completely filled valence shell and as a result it exhibits properties of noble gases, thus it is placed along with noble gases (ns2, np6).

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 8
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Smaller the size of an atom greater is the electronegativity.

Reason (R): Electronegativity refers to the tendency of atom so share electrons with other atom.

Detailed Solution: Question 8

Assertion is true but reason is false.

Electronegativity refers to the tendency of atom to attract bonding electrons.

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 9
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Electron gain enthalpy can be exothermic or endothermic.

Reason (B): Electron gain enthalpy provides a measure of the ease with which an atom adds an electron to form anion.

Detailed Solution: Question 9

Both assertion and reason are true but reason is not the correct explanation of assertion.

Depending on the element, the process of adding an electron to the atom can be either endothermic or exothermic.

Assertion & Reason Test: Classification of Elements & Periodicity in Properties - Question 10
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): According to Mendeleev, periodic properties of elements is a function of their atomic number.

Reason (R): Atomic number is equal to the number of protons.

Detailed Solution: Question 10

According to Mendeleev, physical and chemical properties of elements are periodic function of their atomic weights (atomic masses).
Atomic number is equal to the number of protons. It is also equal to the number of electrons present in the neutral atom.
Assertion is false but Reason is true

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About this NEET Practice Test

This test contains 10 MCQs on Assertion & Reason Test: Classification of Elements & Periodicity in Properties with detailed solutions for each question. It is part of the NCERT Based Tests for NEET course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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