Class 10 Science Chapter 5 MCQ

Class 10 Science Chapter 5 MCQ (Multiple Choice Questions) of Periodic Classification of Elements. Revise all the chapter here in the form of MCQ Online tests. All the MCQs are taken from NCERT books only and answer as well as explanation are given below each question.

After completing the chapter from textbooks, these MCQs are very helpful for the preparation of school tests and final board exams.

Class 10 Science Chapter 5 MCQ for 2020-2021

Class: 10Science
Chapter: 5Multiple Choice Questions (MCQ) Tests

Class 10 Science Chapter 5 MCQ with Answers

MCQ tests practice for class 10 science is given below. Here, you can practice chapter 5 of class 10 science with important MCQs related to NCERT Textbook. Class 10 Science Chapter 5 MCQs are given below with answers and explanation.


Lavish appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. The elements calcium, strontium and barium were put in one group called alkaline earth metal group or alkaline.
[B]. The elements calcium, strontium and barium have similar chemical properties and form a triad.
[C]. The elements calcium, strontium and barium have a valency of 2 (they are divalent).
[D]. All the above.

Newlands’ law of octaves for the classification of elements had the following limitations. Choose the correct limitation:

[A]. Newlands assumed that only 56 elements existed in nature and no more elements would be discovered in the future.
[B]. Newlands’ law of octaves was applicable to the classification of elements up to calcium only.
[C]. In order to fit elements into his table, Newlands put even two unlike elements having very different properties.
[D]. All the above.


While working on the classification of elements, a Russian scientist Mendeleev found different things. Choose the correct one(s):

[A]. There were seven periods (horizontal rows) and eight groups (vertical columns) in the original periodic table of Mendeleev.
[B]. When elements are arranged in the order of increasing atomic masses, the elements with similar properties occur at regular intervals.
[C]. In order to make sure that the elements having similar properties fell in the same vertical column or group, Mendeleev left some gaps in his periodic table.
[D]. All the above.

Which of the following elements does not lose an electron easily?

[A]. Na
[B]. F
[C]. Mg
[D]. Al


Which among the following elements has the largest atomic radii?

[A]. Ca
[B]. Na
[C]. Mg
[D]. K

Which of the following gives the correct increasing order of the atomic radii of O, F and N?

[A]. O, F, N
[B]. N, F, O
[C]. O, N, F
[D]. F, O, N


Pooja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. The arrangement of elements in the modern (long form) periodic table is based on their electronic configurations.
[B]. The elements with atomic numbers 89 to 103 are called “lanthanide series”.
[C]. The number of elements in a period is fixed by the maximum number of electrons which can be accommodated in the various shells of an atom.
[D]. Scientist Neils Bohr who prepared modern periodic table of elements.

Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?

[A]. A, B, C
[B]. B, C, D
[C]. A, D, E
[D]. B, D, E


In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?

[A]. Germanium
[B]. Chlorine
[C]. Oxygen
[D]. Silicon

Rahul is writing some statements about “Periodic Table”. Choose the correct one(s):

[A]. Elements having 6 valence electrons are placed in group 16.
[B]. Elements having 7 valence electrons are placed in group 17.
[C]. Elements having 8 valence electrons (or 2 valence electrons in K shell) are placed in group 18.
[D]. All the above.
why did Mendeléev select Oxygen and Hydrogen to test the chemical properties of elements?

Mendeléev selected hydrogen and oxygen to test the chemical properties of elements as they are very reactive and formed compounds with most elements.

What were the limitations of Mendeleev’s Periodic Law?

1. Isotopes of all elements posed a challenge to Mendeleev’s Periodic Law.
2. The atomic masses do not increase in a regular manner in going from one element to the next. So it was not possible to predict how many elements could be discovered between two elements — especially when we consider the heavier elements.
3. No proper place assigned to Hydrogen.

What is modern periodic law?

The modern periodic law states that Properties of elements are a periodic function of their atomic number.

What happen to atomic radius of atoms when we move from left to right in a period?

The atomic radius decreases in moving from left to right along a period. This is due to an increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size of the atom.

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