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

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

[A]. Lithium, sodium and potassium are called alkali metals because they form alkalis (caustic solutions) on reaction with water.
[B]. When elements are arranged in the order of increasing atomic masses, groups of three elements (known as triads), having similar chemical properties are obtained.
[C]. The elements lithium, sodium and potassium have similar chemical properties and form a triad.
[D]. All the above.
Q2

Which of the following set of elements is written in order of their increasing metallic character?

[A]. Be, Mg, Ca
[B]. Na, Li, K
[C]. Mg, Al, Si
[D]. C, O, N
Q3

Which of the following statement is or are incorrect?

[A]. According to Newlands’ law of octaves, the properties of eighth element sodium should be similar to those of the first element lithium.
[B]. Newlands divided the elements into horizontal rows of eight elements.
[C]. According to Newlands’ law of octaves, the properties of potassium should be similar to that of sodium.
[D]. According to Newlands’ law of octaves, the properties of eighth element magnesium should be similar to those of the first element beryllium.
Q4

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

[A]. Metal
[B]. Metalloid
[C]. Non-metal
[D]. Left-hand side element
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

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.
Q7

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.
Q8

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
Q9

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.
Q10

Which of the following elements would lose an electron easily?

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

Which one of the following elements exhibit maximum number of valence electrons?

[A]. Na
[B]. Al
[C]. Si
[D]. P
Q14

Which of the following is the outermost shell for elements of period 2?

[A]. K shell
[B]. L shell
[C]. M shell
[D]. N shell
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

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
Q17

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group?

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

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

[A]. The group 3 to group 12 elements are called lanthanide series.
[B]. The elements with atomic numbers 57 to 71 are called transition elements.
[C]. The elements with atomic numbers 89 to 103 are called noble metal series.
[D]. The elements on the left side of the periodic table are metals whereas those on the right side are non-metals.
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

Consider the following statements and choose the incorrect one:

[A]. Silicon element is a metalloid which is a semiconductor.
[B]. Silicon is used to make silicon ‘chips’. The silicon chip has enabled scientists to integrate thousands of transistors into a tiny space.
[C]. Silicon chips have made it possible to make circuits incredibly small (as those used in this laptop computer).
[D]. None of the above.
Q25

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

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

Download App for Class 10

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.

Feedback and Suggestion

We are adding new questions as per student’s suggestion. Your suggestions are useful for us in maintaining the quality of the questions. If you have any suggestion to improve the MCQ Tests, please suggest us.