# MCQs for Science Class 10 with Answers Chapter 5 Periodic Classification of Elements

Students of class 10 Science should refer to MCQ Questions Class 10 Science Periodic Classification of Elements with answers provided here which is an important chapter in Class 10 Science NCERT textbook. These MCQ for Class 10 Science with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 10 Science. The following MCQs can help you to practice and get better marks in the upcoming class 10 Science examination

## Chapter 5 Periodic Classification of Elements MCQ with Answers Class 10 Science

MCQ Questions Class 10 Science Periodic Classification of Elements provided below have been prepared by expert teachers of grade 10. These objective questions with solutions are expected to come in the upcoming Standard 10 examinations. Learn the below provided MCQ questions to get better marks in examinations.

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 Periodic Table later?
(a) Chlorine
(b) Silicon
(c) Oxygen
(d) Germanium

D

Question. Which of the following set of elements is written in order of their increasing metallic character?
(a) Na Li K
(b) C Q N
(c) Mg Al Si
(d) Be Mg Ca

D

Question. The non-metals are present:
(a) On the right hand side of the periodic table.
(b) In the middle of the periodic table.
(c) In the centre of the periodic table.
(d) On the left hand side of the periodic table.

A

Question. An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine.
(a) XCl3
(b) XCl
(c) XCl2
(d) XCl5

C

Question. An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
(a) Valency = 6
(b) Valency = 2
(c) Valency = 1
(d) Valency = 3

B

Question. Which of the following is the outermost shell for elements of second period?
(a) K shell
(b) L shell
(c) M shell
(d) N shell

B

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 periodic table later ?
(a) Germanium
(b) Chlorine
(c) Oxygen
(d) Silicon

A

Question. What is the atomic number of element of period 3 and group 17 of the Periodic Table?
(a) 10
(b) 4
(c) 17
(d) 21

C

Question. Dobereiner’s triad arranged the elements with similar properties into:
(a) Periods
(b) Groups
(c) Both period and group
(d) None of these

B

Question. Element X forms a chloride with the formula XCl2 , which is a solid with high melting point. X would most likely be:
(a) Si
(b) Al
(c) Na
(d) Mg

D

Question. The law of the modern periodic table was proposed by:
(a) H.G.I Moselly
(b) Dobereincer
(c) D.I. Mendeleev
(d) Newlands

A

Question. The metal which is hard and has high melting point and used in filaments of electrical bulbs is
(a) Ni
(b) Fe
(c) Pt
(d) W

D

Question. Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br

C

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

C

Question. Modern Periodic law is based upon:
(a) Number of neutrons
(b) Number of electron
(c) Atomic number
(d) Atomic mass

C

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

C

Question. An element has 12 protons. The group and period to which this element belongs to is
(a) 2nd group, 3rd period
(b) 2nd group, 2nd period
(c) 3rd group, 2nd period
(d) 3rd group, 3rd period

A

Question. An atom of an element has the electronic configuration 2,8,2. To which group does it belong?
(a) 4th group
(b) 6th group
(c) 3rd group
(d) 2nd group

D

Question. New lands relation is called
(a) Musical Law
(b) Law of Octaves
(c) Periodic Law
(d) Atomic Mass Law

B

Question. At the time of Mendeleev, the number of elements known was
(a) 63
(b) 65
(c) 62
(d) 64

A

Question. According to IUPAC recommendations, the number of groups in the long form of the periodic table is:
(a) 7
(b) 8
(c) 16
(d) 18

D

Question. The most distinctive property of the noble gases is that they are:
(a) Unreactive
(c) Metalloid
(d) Metallic

A

Question. Which of the following is most reactive
(a) F 2
(b) Cl 2
(c) Br 2
(d) I 2

A

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

B

Question. The element which has least tendency to lose electron is
(a) H
(b) Li
(c) He
(d) Ne

C

Question: If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is –
(a) arsenic
(b) sulphur
(c) iodine
(d) calcium

A

Question: How many periods are there in the long form of the periodic table?
(a) 6
(b) 7
(c) 8
(d) 9

B

Question: The elements with atomic numbers 9, 17, 35, 53 and 85 belong to
(a) alkali metals
(b) alkaline earth metals
(c) halogens
(d) noble gases

C

Question: The elements with atomic numbers 3, 11, 19, 37 and 55 belong to
(a) alkali metals
(b) alkaline earth metals
(c) halogens
(d) noble gases

A

Question: The number of elements in each of the inner transition series are –
(a) 2
(b) 8
(c) 10
(d) 14

D

Question: The number of elements in the third period of the periodic table are –
(a) 2
(b) 8
(c) 18
(d) 32

B

Question: Each transition series contains a total of –
(a) 2 elements
(b) 8 elements
(c) 10 elements
(d) 18 elements

C

Question: The total number of elements in the group IB are –
(a) 3
(b) 5
(c) 7
(d) 9

A

Question: Which of the following elements has the least nonmetallic character?
(a) fluorine
(b) chlorine
(c) bromine
(d) iodine

D

Question: The total number of elements in VII A group of the periodic table are –
(a) 3
(b) 5
(c) 7
(d) 9

B

Question: About how many known elements are there till date?
(a) 10
(b) 50
(c) 118
(d) 200

C

Question: Which of these things you will not find in the periodic table?
(a) element name and symbol
(b) atomic weight
(d) atomic number

C

Question: Which scientist came up with the concept of a periodic table that included all of the known elements?
(a) Joseph Priestly
(b) Dmitri Mendeleev
(c) Antoine Lavoisier
(d) Albert Einstein

B

Question: Elements in the modern periodic table are arranged according to increasing –
(a) atomic number
(b) atomic weight
(c) number of neutrons
(d) chemical reactivity

A

Question: As you go down the group, the alkali metals become –
(a) brighter
(b) hotter
(c) more reactive
(d) less reactive

C

Question: Where are the transition metals in the periodic table?
(a) In group 0
(b) In group 1
(c) In group 2
(d) In a central block

D

Question: The alkali metals are in which group of the periodic table?
(a) Group 1
(b) Group 2
(c) Group 3
(d) Group 4

A

Question: Which of the following element is not in the liquid state?
(a) Hg
(b) Li
(c) Ga
(d) Br

B

Question: Which of the following elements does not belongs to alkaline earth metal group?
(a) Rb
(b) Sr
(c) Ba
(d) Ra

A

Question: The noble gases are unreactive because
(a) they react with sodium.
(b) they have a full outer shell of electrons.
(c) they have a half outer shell of neutrons.
(d) they are too thin.

B

Question: Arrange the following in increasing order of their atomic radius : Na, K, Mg, Rb –
(a) Mg < K < Na < Rb
(b) Mg < Na < K < Rb
(c) Mg < Na < Rb < K
(d) Na < K < Rb < Mg

B

Question: Which shows variable valency?
(a) s–block elements
(b) p–block elements
(c) d–block elements

C

(a) Li, K, Rb
(b) Mg, S, As
(c) Cl, Br, I
(d) P, S, As

C

Question: Which is metalloid?
(a) Pb
(b) Sn
(c) Si
(d) Zn

C

Question: Which of the following elements is a lanthanide (Rare– earth element)?
(b) californium
(c) cerium
(d) cesium

C

Question: If the valene shell electronic configuration for an element is ns2np5, this element will belong to the group of –
(a) alkali metals
(b) inert metals
(c) noble gases
(d) halogens

D

Question: Elements in which 4f orbitals are progressively filled are called as –
(a) transition elements
(b) lanthanides
(c) actinides
(d) inert gases

B

Question: Which of the following is the atomic number of a metal?
(a) 32
(b) 34
(c) 36
(d) 38

D

Question: On moving from left to right across a period in the table the metallic character –
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

B

Question: Which has the maximum atomic radius?
(a) Al
(b) Si
(c) P
(d) Mg

D

Question: If an atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, it will be placed in –
(a) second group
(b) third group
(c) fifth group
(d) sixth group

C

True / False :

Question. Magnesium is more metallic in nature than sodium.

False

Question. Elements are classified on the basis of similarities in their properties.

True

Question. Atomic radii decrease from left to right across a row of the periodic table.

True

Question. The columns of the periodic table are called groups.

True

Question. As number of shells increases, atomic orbitals become larger and less stable.

True

Question. You will find metals on the extreme right side of the periodic table.

False

Question. Atomic radii increase from top to bottom down a column of the periodic table.