Classification of Elements and Periodicity Practice Questions
JEE · Chemistry · 1215 free MCQs with instant results and detailed explanations.
1215
Total
234
Easy
542
Medium
439
Hard
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Topics in Classification of Elements and Periodicity
Electronegativity
192
Electron Gain Enthalpy
197
Atomic and Ionic Radii
196
Ionization Enthalpy
203
Modern Periodic Table
235
Periodic Trends
192
Sample Questions from Classification of Elements and Periodicity
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following correctly describes the periodic law?
A.
Properties of elements are periodic functions of their atomic numbers.
B.
Elements are arranged by increasing atomic mass.
C.
All elements have similar properties in the same group.
D.
The atomic mass of an element increases down a group.
Show Answer & Explanation
Correct Answer: A
The modern periodic law states that the properties of elements are periodic functions of their atomic numbers, which means that when elements are arranged in order of increasing atomic number, their properties show a periodic pattern.
Q2
Easy
Which group of elements in the periodic table is known as noble gases?
A.
Group 1
B.
Group 17
C.
Group 18
D.
Group 2
Show Answer & Explanation
Correct Answer: C
Noble gases are located in Group 18 of the periodic table and are characterized by their lack of reactivity due to having a complete valence shell.
Q3
Easy
Which element has the highest electronegativity according to the periodic trends?
A.
Fluorine
B.
Oxygen
C.
Chlorine
D.
Nitrogen
Show Answer & Explanation
Correct Answer: A
Fluorine is known to have the highest electronegativity value of all elements, making it the most effective at attracting electrons in a bond.
Q4
Medium
Which period of the modern periodic table contains the elements with atomic numbers 21 to 30?
A.
Period 4
B.
Period 5
C.
Period 6
D.
Period 7
Show Answer & Explanation
Correct Answer: B
Elements with atomic numbers 21 to 30 fall in Period 5 of the periodic table, which includes Scandium to Zinc.
Q5
Medium
What is the general trend in atomic size as you move from left to right across a period in the modern periodic table?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Increases then decreases
Show Answer & Explanation
Correct Answer: B
Atomic size decreases from left to right across a period due to increasing nuclear charge, which pulls electrons closer to the nucleus.
Q6
Medium
Which group in the modern periodic table contains the noble gases?
A.
Group 1
B.
Group 7
C.
Group 8
D.
Group 2
Show Answer & Explanation
Correct Answer: C
Noble gases belong to Group 8 (or Group 0) and are characterized by their complete valence shell, making them highly stable and unreactive.
Q7
Medium
In which block of the periodic table would you find the element with the electronic configuration [Kr] 5s² 4d¹⁰ 5p²?
A.
s-block
B.
p-block
C.
d-block
D.
f-block
Show Answer & Explanation
Correct Answer: B
The given electronic configuration ends with 5p², indicating that it belongs to the p-block of the periodic table, which includes groups 13 to 18.
Q8
Hard
Which of the following elements has the highest ionization energy?
A.
Helium
B.
Lithium
C.
Beryllium
D.
Boron
Show Answer & Explanation
Correct Answer: A
Helium has the highest ionization energy due to its small atomic size and full outer shell, making it very stable.
Q9
Hard
Which of the following pairs of elements is incorrectly matched with respect to their group in the periodic table?
A.
Sodium - Group 1
B.
Calcium - Group 2
C.
Aluminum - Group 13
D.
Chlorine - Group 16
Show Answer & Explanation
Correct Answer: D
Chlorine is in Group 17, not Group 16, as it is a halogen.
Q10
Hard
Which of the following statements about the periodic law is true?
A.
Properties of elements are periodic functions of their atomic masses.
B.
Properties of elements are periodic functions of their atomic numbers.
C.
Periodic law does not apply to isotopes.
D.
Periodic table is based solely on electron affinity.
Show Answer & Explanation
Correct Answer: B
The modern periodic law states that the properties of elements are periodic functions of their atomic numbers, not atomic masses.
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Classification of Elements and Periodicity — JEE Chemistry Practice Questions Online
This page contains 1215 practice MCQs for the chapter Classification of Elements and Periodicity in JEE Chemistry. The questions are organized by difficulty — 234 easy, 542 medium, 439 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 6 topics, giving you comprehensive coverage of the entire chapter.