Periodic Classification of Elements Practice Questions
Class 10 · Science · 3125 free MCQs with instant results and detailed explanations.
3125
Total
968
Easy
1555
Medium
602
Hard
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Topics in Periodic Classification of Elements
Trends in Periodic Table
1002
Modern Periodic Table
1100
Mendeleev's Periodic Table
1023
Sample Questions from Periodic Classification of Elements
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which element was placed in the same group as sodium in Mendeleev's periodic table?
A.
Potassium
B.
Calcium
C.
Magnesium
D.
Iron
Show Answer & Explanation
Correct Answer: A
Mendeleev placed potassium in the same group as sodium due to their similar chemical properties.
Q2
Easy
In Mendeleev's periodic table, how were elements arranged?
A.
By atomic number
B.
By atomic mass
C.
By electron configuration
D.
By reactivity
Show Answer & Explanation
Correct Answer: B
Mendeleev arranged the elements in order of increasing atomic mass and grouped them according to similar properties.
Q3
Easy
Mendeleev left gaps in his periodic table for elements that were:
A.
Already discovered
B.
Not yet discovered
C.
Isotopes
D.
Noble gases
Show Answer & Explanation
Correct Answer: B
Mendeleev predicted the existence of elements that had not yet been discovered, leaving gaps for them in his table.
Q4
Medium
Which of the following correctly reflects Mendeleev's prediction about undiscovered elements?
A.
He predicted the properties of elements based on atomic masses.
B.
He ignored the periodic law for groups.
C.
He categorized elements by their reactivity alone.
D.
He excluded noble gases from his table.
Show Answer & Explanation
Correct Answer: A
Mendeleev predicted properties of undiscovered elements based on their atomic masses and their positions in the periodic table.
Q5
Medium
In Mendeleev’s Periodic Table, which of the following groups contained elements with similar properties?
A.
Elements in the same period
B.
Elements in the same group
C.
Elements in different groups
D.
Elements of different atomic masses
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Correct Answer: B
In Mendeleev's table, elements in the same group have similar properties due to their similar valence electrons.
Q6
Medium
Why did Mendeleev leave gaps in his periodic table?
A.
To accommodate undiscovered elements
B.
To separate metals from non-metals
C.
To indicate elements with atomic mass discrepancies
D.
To create a symmetrical table
Show Answer & Explanation
Correct Answer: A
Mendeleev left gaps for elements that had not been discovered yet but were predicted based on properties.
Q7
Medium
Which of the following is a limitation of Mendeleev's Periodic Table?
A.
It classified elements with incorrect atomic masses.
B.
It had no gaps for undiscovered elements.
C.
It did not include all known elements.
D.
It ignored the reactivity of elements.
Show Answer & Explanation
Correct Answer: A
Mendeleev's table sometimes grouped elements with incorrect atomic masses, leading to anomalies in classification.
Q8
Hard
Which of the following elements was placed in the same group as lithium in Mendeleev's periodic table due to its similar properties?
A.
Sodium
B.
Potassium
C.
Beryllium
D.
Calcium
Show Answer & Explanation
Correct Answer: A
Mendeleev grouped elements based on their chemical properties. Lithium and Sodium both belong to Group 1 (alkali metals) and exhibit similar characteristics.
Q9
Hard
In Mendeleev's periodic table, how did he manage the placement of elements with similar properties but different atomic masses?
A.
He adjusted their atomic masses
B.
He placed them in the same group
C.
He prioritized chemical properties over atomic mass
D.
He separated them into different periods
Show Answer & Explanation
Correct Answer: C
Mendeleev prioritized the chemical properties of elements over their atomic masses when arranging his periodic table, leading to deviations.
Q10
Hard
Which of the following best describes Mendeleev's periodic law?
A.
Properties are a function of atomic mass
B.
Properties are a function of atomic number
C.
Properties are random
D.
Properties are a function of molecular mass
Show Answer & Explanation
Correct Answer: A
Mendeleev's periodic law states that the physical and chemical properties of elements are periodic functions of their atomic masses.
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Periodic Classification of Elements — Class 10 Science Practice Questions Online
This page contains 3125 practice MCQs for the chapter Periodic Classification of Elements in Class 10 Science. The questions are organized by difficulty — 968 easy, 1555 medium, 602 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 3 topics, giving you comprehensive coverage of the entire chapter.