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 2022-2023

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.

Q1

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.
Q2

Consider the following statements and choose the correct one(s):

[A]. All the three elements, lithium, sodium and potassium possess similar chemical properties.
[B]. All the three elements, beryllium, magnesium and calcium possess similar chemical properties
[C]. Newlands assumed that only 56 elements existed in nature and no more elements would be discovered in the future.
[D]. All the above.
Q3

Which of the following elements will form an acidic oxide?

[A]. An element with atomic number 7
[B]. An element with atomic number 3
[C]. An element with atomic number 12
[D]. An element with atomic number 19
Q4

Three elements B, Si and Ge are:

[A]. Metals
[B]. Non-metals
[C]. Metalloids
[D]. Metal, non-metal and metalloid respectively
Q5

Consider the following statements and choose the incorrect one:

[A]. In Mendeleev’s periodic table, the elements are arranged on the basis of their atomic masses, atomic numbers and also on the similarity of chemical properties.
[B]. Dobereiner’s triads did not exist in the columns of Newlands’ classification of elements based on the law of octaves
[C]. The periodic table is a chart of elements prepared in such a way that the elements having different properties occur in the same vertical column but similar in group.
[D]. All the above.
Q6

What type of oxide would Eka–Aluminium form?

[A]. EO3
[B]. E3 O2
[C]. E2O3
[D]. EO
Q7

Read the following sentences carefully, and choose the correct one:

[A]. The elements having similar chemical properties form oxides having similar formulae. They also form hydrides having similar formulae.
[B]. The elements Li, Na, and K form the oxides Li2O, Na2O and K2O, having the same general formula R2O.
[C]. The elements Li, Na, and K form the hydrides LiH, NaH and KH, having the same general formula RH.
[D]. All the above.
Q8

Arrange the following elements in the order of their increasing nonmetallic character: Li, O, C, Be, F

[A]. F < O < C < Be < Li
[B]. Li < Be < C < O< F
[C]. F < O < C < Be < Li
[D]. F < O < Be < C < Li
Q9

On moving from left to right in a period in the periodic table, the size of the atom.

[A]. Increases
[B]. Decreases
[C]. Does not change appreciably
[D]. First decreases and then increases
Q10

Which of the following are the characteristics of isotopes of an element?

[A]. Isotopes of an element have same atomic masses, Isotopes of an element show same physical properties, Isotopes of an element show same chemical properties.
[B]. Isotopes of an element have same atomic number, Isotopes of an element show same physical properties, Isotopes of an element show same chemical properties.
[C]. Isotopes of an element have same atomic number, Isotopes of an element show same physical properties.
[D]. Isotopes of an element have same atomic number, Isotopes of an element show same chemical properties.
Q11

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. The modern periodic law is based on the atomic numbers of elements.
[B]. In the modern periodic law the electronic configuration of sodium is similar to that of lithium
[C]. The electronic configuration of silicon is 2, 8, 6.
[D]. When the elements are arranged according to increasing atomic numbers, then the elements having same number of valence electrons occur at regular intervals (or periods).
Q12

Which among the following elements has the largest atomic radii?

[A]. Ca
[B]. Na
[C]. Mg
[D]. K
Q13

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
Q14

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. The element C (carbon) is in group IV of Mendeleev’s periodic table in which the general formula of the oxides of elements is RO2. So, the formula of oxide of C will be CO2.
[B]. The element Si (silicon) is in group IV of Mendeleev’s periodic table in which the general formula for the oxides of elements is RO2. So, the formula of the oxide of Si will be SiO2.
[C]. The element Ba (barium) is in group II of Mendeleev’s periodic table in which the general formula for the oxides of elements is RO. So, the formula of oxide of Ba will be BaO.
[D]. None of the above.
Q15

An element which is an essential constituent of all organic compounds belongs to

[A]. Group 1
[B]. Group 14
[C]. Group 15
[D]. Group 16
Q16

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.
Q17

Consider the following statements and choose the incorrect one:

[A]. 4th period contains 18 elements. It is called long period.
[B]. 5th period contains 18 elements. It is also a long period.
[C]. 6th period contains 32 elements. It is called very long period.
[D]. None of the above
Q18

Read the following sentences carefully, and choose the incorrect one(s):

[A]. The horizontal rows of elements in a periodic table are called periods.
[B]. All other periods start with noble gases like neon, argon, krypton, etc. and end with alkali metals like lithium, sodium, potassium, etc.
[C]. The elements in a period have consecutive (continuous) atomic numbers.
[D]. The figures 2, 8, 18, 32, etc., representing the maximum number of electrons which can be put in the various shells of the atoms.
Q19

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
Q20

Which of the following statements about the Modern Periodic Table is correct?

[A]. It has 18 horizontal rows known as Periods.
[B]. It has 7 vertical columns known as Periods.
[C]. It has 18 vertical columns known as Groups.
[D]. It has 7 horizontal rows known as Groups.
Q21

Sunakshi is completed her science chapter where she wrote some statements on “Periodic Table”. She wants to know whether the statements are correct or not? Sunakshi wants to take help from you:

[A]. In group 1 consists of alkali metals lithium, sodium, potassium, etc., all having 1 valence electron in their atoms.
[B]. In group 17 contains halogens like fluorine, chlorine, bromine and iodine, etc., all having 7 valence electrons.
[C]. Group 18 elements are known as noble gases or inert gases, all having 8 electrons in their outermost shells (except helium which has only 2 electrons in the K valence shell).
[D]. All the above.
Q22

In a science quiz competition, Simran are asked a question where she had to choose the statement which was/were incorrect?

[A]. The vertical columns in a periodic table are called groups.
[B]. There are 18 groups in the long form of periodic table.
[C]. The elements in a group do not have consecutive atomic numbers.
[D]. The groups 2 and 3, and 13 to 18 contain the normal elements (typical elements or representative elements).
Q23

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
Q24

According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of

[A]. Increasing atomic number
[B]. Decreasing atomic number
[C]. Increasing atomic masses
[D]. Decreasing atomic masses
Q25

Upto which element, the Law of Octaves was found to be applicable.

[A]. Oxygen
[B]. Calcium
[C]. Cobalt
[D]. Potassium

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why did Mendeléev select Oxygen and Hydrogen to test in 10th Science Chapter 5?

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 as in 10th Science ch. 5?

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 according to Class 10 Science Chapter 5?

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 in 10th Science?

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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