Please refer to Chapter 5 Periodic Classification of Elements MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Periodic Classification of Elements and then attempt the following objective questions.

MCQ Questions Class 10 Science Chapter 5 Periodic Classification of Elements

The Periodic Classification of Elements MCQ Class 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. As we move from left to right in a period in modern periodic table, Atomic sizes of the elements generally
(a) increase
(b) decrease
(c) remain same
(d) approach zero

Question. Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
(a) The chemical reactivity of metals increases.
(b) The metallic character of elements increases.
(c) The size of the atom increases.
(d) The valence electrons increase.

Question. The arrangement of elements in the Modem Periodic Table is based on their
(a) increasing atomic mass in the period
(b) increasing atomic number in the horizontal rows
(c) increasing atomic number in the vertical columns
(d) increasing atomic mass in the group

Question. Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?
(a) The oxides become more acidic
(b) The elements become less metallic
(c) There is an increase in the number of valence electrons
(d) The atoms lose their electrons more easily

Question. 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

Question. An element ‘X’ is forming an acidic oxide. Its position in modern periodic table will be
(a) Group 1 and Period 3
(b) Group 2 and Period 3
(c) Group 13 and Period 3
(d) Group 16 and Period 3 

Question. Up to which element, the Law of Octaves was found to be applicable?
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium

Question. 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

Question. Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
(a) Group 8
(b) Group 2
(c) Group 18
(d) Group 10

Question. Element ‘X’ forms a chloride with formula XCl2, which is a solid with high melting point. ‘X’ would most likely to be in the same group of the periodic table as:
(a) Na,
(b) Mg,
(c) Al
(d) Si 

Question. An element ‘X’ with atomic number 11 forms a compound with element ‘Y’ with atomic number 8. The formula of the compound formed is
(a) XY
(b) X₂Y
(c) XY₂
(d) X₂Y₃ 

Question. Consider the following statements about an element ‘X’ with number of protons 13.
(A) It forms amphoteric oxide (B) Its valency is three
(C) The formula of its chloride is XCl₃
The correct statements(s) is/are
(a) only (A)
(b) only (B)
(c) (A) and (C)
(d) (A), (B) and (C)

Question. 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 mass
(d) decreasing atomic mass

Question. 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 perioidc table later?
(a) Germanium
(b) Chlorine
(c) Oxygen
(d) Silicon

Question. Which of the following statement(s) about the Modern Periodic Table are incorrect?
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
(iii) Isotopes are placed in adjoining group(s) in the Periodic Table
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only

Question. On the basis of electronic configuration of ⁹₅ X, the group number and period of the element ‘X’ is:
(a) Group 15 period 2
(b) Group 13 period 2
(c) Group 19 period 5
(d) Group 13 period 5

Question. What is the basis of long form of the periodic table?
(a) Atomic mass
(b) Atomic number
(c) Atomic size
(d) Metallic and Non-metallic character

Question. An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
(a) Group 1
(b) Group 4
(c) Group 2
(d) Group 3

Question. How many elements are placed in lanthanide and actinide series?
(a) 57, 89
(b) 14, 14
(c) 89, 57
(d) 14, 16

Question. Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is
(a) 7
(b) 14
(c) 24
(d) 16

Question. Which of the following elements of noble gases participate in chemical reaction?
(a) Kr, Rn
(b) He, Kr
(c) Rn, He
(d) He, Ne

Question. Assertion: There are 118 elements dis-covered so far.
Reason: Sulphur (16) belongs to Group 16 and belongs to 3rd period.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Question. Name the neutral atom in the Periodic Table which has the same number of electrons as K + and Cl – .
(a) Helium
(b) Argon
(c) Neon
(d) Krypton

Question. An element has an atomic number of 15 with which of the following elements will it show similar chemical properties.
(a) Be (4)
(b) Ne (10)
(c) N (7)
(d) O (8)

Question. Mendeleev’s classification was based on.
(a) Increasing atomic mass
(b) Decreasing atomic number
(c) Increasing atomic number
(d) Decreasing atomic mass

Question. Which one of the following elements exhibit the maximum number of valence electrons?
(a) Na
(b) Al
(c) Si
(d) P

Question. Chlorine (17) belongs to which group and period
(a) 7, 3
(b) 17, 3
(c) 1, 3
(d) 16, 3

Question. The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?
(a) A and B
(b) A and C
(c) B and C
(d) None

Question. Which of the following sets of elements do not belong to the same group?
(a) F, Cl, Br
(b) Na, K, Rb
(c) P, S, Cl
(d) C, Si, Ge

Question. What is the basis of long form of the periodic table?
(a) Atomic mass
(b) Atomic number
(c) Atomic size
(d) Metallic and Non-metallic character

Question. Which of the following is most reactive
(a) Li
(b) H
(c) Na
(d) K

Question.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

Question. The elements of group 16 are called
(a) Chalcogens
(b) Halogens
(c) Pnicogens
(d) Noble gases

Question. Up to which element, the Law of Octaves was found to be applicable:
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium

Question. Assertion: Fluorine is more reactive than chlorine.
Reason: Fluorine and chlorine belong to Group 17 called Halogen.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Question. Nitrogen and phosphorus belong to the group 15 of the periodic table. Which of these will be more electro negative?
(a) Phosphorus
(b) Both are equally electro negative
(c) Nitrogen
(d) None of these

Question. Assertion: K is more reactive than Na.
Reason: K is smaller in size than Na.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Assertion-reason Type Questions :

For question numbers 1 to 4 two statements are given‑one labeled as Assertion (A) and the other labeled
Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘R’ is true.

Question. Assertion: The formula of oxide of nitrogen is N₂O₅. and H₂O is oxide of hydrogen.
Reason: N₂O₅ is acidic oxide H2O is neutral oxide.

Question. Assertion: Element with atomic number 118 belongs to group 18.
Reason: Element with atomic number 118 has 8 valence electrons.

Question. Assertion: SiCl₄ is covalent compound
Reason: Si can lose electrons and chlorine can gain electron.

Question. Assertion: Ionic compounds have high melting point.
Reason: Ionic compounds do not conduct electricity in solid state.

For question numbers 1 and 2 two statements are given‑one labeled as Assertion (A) and the other labeled
Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Increasing order of atomic masses could not be maintained in Mendeleev’s periodic table.
Reason: His periodic table helps in correction of atomic masses of some of the elements in the beginning.

Question. Assertion: Dobereiner adjusted two elements in the same slot.
Reason: Dobereiner could not classify all the elements in triads.

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question. Assertion: Silicon, germanium are the metalloids in the modern periodic table.   
Reason: Silicon, germanium has properties of metal as well as non metals.

Question. Assertion: Oxygen atom is divalent in most of its compounds.   
Reason: Valency is the number of valence electrons present in the outermost shell of its atom.

Question. Assertion: Bulbs are usually filled with chemically active gases.   
Reason: Nitrogen and argon gases are filled in order to prolong the life of the filament.

Question. Assertion : Group 1 elements are known as the alkali elements.   
Reason : s-orbital can accommodate only two electrons.

Question. Assertion: Ionic size of N3^– is greater than F–.   
Reason: N3^– and F^– are isoelectronic anions.

Question. Assertion : According to Mendeleev, periodic properties of elements are functions of their atomic number.   
Reason : Atomic number is equal to the number of protons.

Question. Assertion : Nitrogen has higher ionization energy than that of oxygen.   
Reason : Nitrogen has smaller atomic size than that of oxygen.

Question. Assertion : Elements in the same vertical column have similar properties.   
Reason : Elements have periodic dependence upon the atomic number.

Question. Assertion: Atomic radius of aluminium atom is larger than magnesium atom. 
Reason: Effective nuclear charge increase from magnesium to aluminium.

True / False :

Question. The elements silicon, germanium and arsenic are called metalloids.  

Question. Noble gases are placed extremely left in the periodic table.  

Question. As nuclear charge increases, atomic orbitals become smaller and more stable.  

Question. The number of shells increases in a given period from left to right in the periodic table.  

Question. Fluorine has highest electron affinity in the periodic table.  

Question. Although the order of elements is based on atomic number, vertical families share similar chemical properties.  

Question. Rows in the periodic table are called periods.  

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