NCERT Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Test Mock Test
This free online test covers Chapter 3, Classification of Elements and Periodicity in Properties, from the NCERT Class 11 Chemistry Part I textbook. The 29 questions are written directly from the chapter — definitions, processes, worked examples and the points the book italicises — so a score here tells you how much of the chapter actually stuck, not how well you guess. Each answer carries an explanation that says why the right option is right and why the other three fail, which is where most of the learning happens. Attempt it after your first read of the chapter, then again before the exam. There is no negative marking, and you can review the full solution the moment you submit.
Duration
29 mins
Questions
29 MCQs
Total Marks
29 pts
Negative
0 per wrong
Topics Covered in This Paper
Sample Questions
Q1.Dobereiner's law of triads, noted by 1829, said that in each group of three elements such as Li, Na, K:
- AThe atomic weight of the middle element is the sum of the other two
- BThe atomic weight of the middle element is about half way between those of the other two, and its properties are in between as well
- CThe three elements have the same atomic weight but different properties
- DEvery third element repeats the properties of the first
Q2.Newlands' law of octaves, proposed in 1865, held that on arranging the elements in increasing order of atomic weight, every eighth element resembles the first. Its main weakness was that:
- AIt ignored atomic weights altogether and used atomic numbers instead
- BIt seemed to be true only for elements up to calcium
- CIt left gaps for elements that had not yet been discovered
- DIt could not be applied to any element lighter than sodium
Q3.Mendeleev placed iodine in Group VII along with fluorine, chlorine and bromine even though its atomic weight is lower than that of tellurium in Group VI. He did this because:
- ATellurium had not yet been discovered when he drew up his table
- BHis primary aim was to keep elements of similar properties in the same group, and he suspected the atomic weight measurements might be incorrect
- CHe wished to leave a gap for an element he called eka-iodine
- DHe was following the modern periodic law, which orders elements by atomic number
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Disclaimer: The questions provided here are extracted and digitized from previous year papers using automated processes. They may contain typographical errors, formatting issues, or minor variations from the actual examination paper. While we have done our best to verify the accuracy of the official answer keys, discrepancies may occasionally exist. Please refer to the official commission website for the most authentic paper.
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FAQ
Frequently asked questions
Frequently Asked Questions
- How many questions are in the NCERT Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Test mock test?
- This paper has 29 multiple-choice questions carrying 29 marks in total, to be attempted in 29 minutes.
- Is the NCERT Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Test mock test free to attempt?
- Yes. You can attempt the full paper online for free on AI Test Planet, and see your score and correct answers immediately after submitting.
- Does this paper have negative marking?
- No, there is no negative marking on this paper, so an attempted guess costs you nothing.
- Are solutions and explanations available?
- Yes. After you submit, every question shows the correct answer with a step-by-step explanation, along with a topic-wise breakdown of your performance.