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 2021-2022

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 one of the following does not increase while moving down the group of the periodic table?

[A]. Atomic radius
[B]. Metallic character
[C]. Valence
[D]. Number of shells in an element
Q4

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.
Q5

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.




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

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

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

[A]. When an element from the left side of the periodic table combines with an element from the right side of the periodic table, ionic bond is formed.
[B]. If two (or more) elements have the same number of valence electrons, then they belong to the different group of the periodic table.
[C]. The atomic number 2 is of helium, thus the element A is inert gas helium.
[D]. When an element from the right side of the periodic table combines with another element from the same side, a covalent bond is formed.
Q10

Which of the following elements would lose an electron easily?

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



Q11

Which one of the following does not increase while moving down the group of the periodic table?

[A]. Atomic radius
[B]. Metallic character
[C]. Valence
[D]. Number of shells in an element
Q12

Which of the following statement is or are correct?

[A]. The period number of an element is equal to the number of electron shells in its atom.
[B]. If two (or more) elements have the same valence shell, then they belong to the same period of the periodic table.
[C]. The group number of an element having up to two valence electrons is equal to the number of valence electrons.
[D]. All the above.
Q13

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

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

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
Q22

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.
Q23

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
Q24

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.
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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