MCQs for Class 10 Science Chapter 5 Periodic Classification of Elements

MCQs for Class 10 Science Chapter 5 Periodic Classification of Elements: In this article, we have covered all the important MCQs for Free for Class 10 Term 1 2021-22 Board Exams. In accordance with the latest pattern, Padhle is here with MCQ Questions for Class 10.

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Class 10 for MCQ Science Chapter 5 Periodic Classification of Elements

Question 1:
Which of the element whose atomic number is given below cannot accommodate in the present set up of the long form of the periodic table?
(a) 107
(b) 118
(c) 102
(d) 126

Answer : (d) 126

Question 2:
Vertical columns are called as –
(a) groups
(b) periods
(c) rows
(d) none

Answer : (a) groups

Question 3:
How many groups are there in the periodic table?
(a) 18
(b) 8
(c) 28
(d) 17

Answer : (a) 18

Question 4:
What is the symbol of the element Tungsten?
(a) Tu
(b) W
(c) Ta
(d) Tw

Answer: (b) W

Question 5:
Which group was added to Mendeleev’s periodic table?
(a) I group
(b) VIII group
(c) zero group
(d) V group

Answer: (c) zero group

Question 6:
Which type of elements are poor conductors of heat and electricity?
(a) Metals
(b) Non-metals
(c) Gases
(d) None of these

Answer: (b) Non-metals

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Question 7:
What is the special name given to the 17th group?
(a) chalcogens
(b) halogens
(c) alkali metals
(d) inert gases

Answer: (b) halogens

Question 8:
When an atom of iodine becomes an iodide ion (I^–) the radius will
(a) decrease
(b) increase
(c) remain the same
(d) none

Answer: (b) increase

Question 9:
Chalcogens are?
(a) ore-forming
(b) salt-forming
(c) hydroxide forming
(d) None

Answer: (a)ore-forming

Question 10:
Eka-aluminium and Eka-silicon are known as
(a) gallium and germanium
(b) aluminum and silicon
(c) iron and sulfur
(d) neutron and proton

Answer: (a) gallium and germanium

Question 11:
Atomic mass is equal to the sum of ____.
A) P+N
B) P+E
C) Number of Protons
D) Number of neutrons

Answer: (a) P+N

Question 12:
The element with atomic number 26 will be found in group
(a) 2
(b) 8
(c) 6
(d) 10

Answer: (b) 8

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Question 13:
Name the most electronegative element of the Periodic table?
(a) Chlorine
(b) Bromine
(c) Fluorine
(d) Iodine

Answer: (c) Fluorine

Question 14:
The total number of electrons present in the first twenty elements of the periodic table is
(a) 250
(b) 230
(c) 210
(d) 190

Answer: (c) 210

Question 15:
Electron affinity is ____.
(a) always negative
(b) always positive
(c) can be negative or positive
(d) zero

Answer: (c) can be negative or positive

Question 16:
The inert gas which lies in third period is
(a) Helium
(b) Neon
(c) Argon
(d) Xenon

Answer: (c) Argon

Question 17:
Ionisation energy is measured in –
(a) KJ/g
(b) J/mole
(c) KJ/mol
(d) none

Answer: (c) KJ/mol

Question 18:
The longest period of the Modern Periodic Table is period.
(a) first
(b) second
(c) fourth
(d) sixth

Answer: (d) sixth

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Question 19:
Out of Mg and Al which has higher ionisation energy?
(a) Mg
(b) Al
(c) Both have same
(d) None

Answer: (b) Al

Question 20:
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table?
(а) The elements becomes less metallic in nature
(b) The number of valance electrons increases
(c) The atoms lose their electrons more easily
(d) The oxides become more acidic

Answer: (c) The atoms lose their electrons more easily

Question 21:
Write valency of Iron ?
(a) 2
(b) 3
(c) 0
(d) 2,3

Answer: (d) 2,3

Question 22:
Which of the following is the valance shell for the elements of second period of the modern periodic table?
(a) M shell
(b) K shell
(c) L shell
(d) N shell

Answer: (c) L shell

Question 23:
Out of F and Cl, which has higher electron affinity ?
(a) Cl
(b) F
(c) Both have same
(d) none

Answer: (a) Cl

Question 24:
Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
(a) Group 8
(b) Group 18
(c) Group 10
(d) Group 16

Answer: (b) Group 18

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Question 25:
Upto which element, the law of octaves was found to be applicable –
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium

Answer: (b) Calcium

Question 26:
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element have the largest atomic radius is:
(a) Mg
(b) Na
(c) K
(d) Ca

Answer: (c) K

Question 27:
According to Mendeleev’s Periodic law, the elements were arranged in Periodic table according to –
(a) Increasing atomic number
(b) decreasing atomic number
(c) Increasing atomic masses
(d) decreasing atomic masses

Answer: (c) Increasing atomic masses

Question 28:
In Mendeleev’s Periodic table, gaps were left for many elements. Pick any one out of them.
(a) Germanium
(b) Chlorine
(c) Oxygen
(d) Silicon

Answer: (a) Germanium

Question 29:
On which factor does ionisation energy depend?
(a) Size of an atom
(b) nuclear charge
(c) electronic configuration
(d) all

Answer: (d) all

Question 30:
Which is biggest in size –
(a) Lithium
(b) sodium
(c) Magnesium
(d) potassium

Answer: (d) potassium

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Question 31:
The number of electrons in valence shell is equal to –
(a) Atomic mass
(b) Group number
(c) period number
(d) Atomic volume

Answer: (b) Group number

Question 32:
In periodic table, Helium is placed at ___
(a) top left corner
(b) bottom right corner
(c) bottom left corner
(d) top right corner

Answer: (d) top right corner

Question 33:
Which statement is correct for left to right movement in periodic table?
(a) elements become less metallic from left to right
(b) number of valence electrons increases
(c) atoms lose electrons easily
(d) oxides become more acidic

Answer: (c) atoms lose electrons easily

Question 34:
Which of the following elements will form acidic oxide?
(a) with atomic number 7
(b) with atomic number 3
(c) with atomic number 12
(d) with atomic number 19

Answer: (c) with atomic number 12

Question 35:
Which of the following gives the correct order of atomic radii of O, F and N?
(a) O,F,N
(b) N,F,O
(c) O,N,F
(d) F,O,N

Answer: (d) F,O,N

Question 36:
Which of them doesn’t loose electrons easily?
(a) Na
(b) F
(c) Mg
(d) Al

Answer: (b) F

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Question 37:
Arrange the following elements in order of their increasing metallic character Na,Si,Cl,Mg,Al ?
(a) Cl>Si>Al>Mg>Na
(b) Na>Mg>Al>Si>Cl
(c) Na>Al>Mg>Cl>Si
(d) Al>Na>Si>Ca>Mg

Answer: (b) Na>Mg>Al>Si>Cl

Question 38:
Arrange the following elements in order of their increasing non metallic 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

Answer: (c) F<O<C<Be<Li

Question 39:
Which element was not known when Mendeleev proposed the classification?
(a) Hydrogen
(b) Sodium
(c) Copper
(d) Germanium

Answer: (c) Copper

Question 40:
The law of octaves is given by ___.
(a) Mendeleev
(b) Newlands
(c) Bohr
(d) Mosley

Answer: (b) Newlands

Question 41:
An element with atomic number will form a basic oxide________
(a) 7
(b) 17
(c) 14
(d) 11

Answer: (d) 11

Question 42:
The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?
(a) N(7)
(b) P(15)
(c) Na(11)
(d) F (9)

Answer: (d) F (9)

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Question 43:
Identify the wrong sequence of the elements in a group
(a) Ca, Br, Ba
(b) Cu, Au, Ag
(c) N,P, As
(d) Cl, Br, I

Answer: (b) Cu, Au, Ag

Question 44:
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

Answer: (d) Be Mg Ca

Question 45:
Which is not true about the noble gases?
(a) They are non metallic in nature
(b) They exist in atomic form
(c) They are radioactive in nature
(d) Xenon is the most reactive among these

Answer: (c) They are radioactive in nature

Question 46:
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.

Answer: (d) The valence electrons increase.

Question 47:
Identify the group which is not a Dobereiner triad
(a) Li, Na, K
(b) Be, Mg, Cr
(c) Ca, Sr, Ba
(d) Cl, Br, I

Answer: (b) Be, Mg, Cr

Question 48:
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

Answer: (b) Valency = 2

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Question 49:
Electronic configuration of Al+3 is
(a) 2,8,3
(b) 2,8,8
(c) 2,8
(d) 2,8,8,3

Answer: (c) 2,8

Question 50:
Consider the following elements
₂₀Ca, ₈Or ₁₈Ar, ₁₆S, ₄Be, ₂He
Which of the above elements would you expect to be in group 16 of the Periodic Table?
(a) ₂₀Ca and ₁₆S
(b) ₂₀Ca and ₈O
(c) ₁₈Ar and ₁₆S
(d) ₈O and ₁₆S

Answer: (d) ₈O and ₁₆S

Question 51:
In the third period of the periodic table the element having smallest size is
(a) Na
(b) Ar
(c) Cl
(d) Si

Answer: (b) Ar

Question 52:
An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is.
(a) 2
(b) 4
(c) 3
(d) 1

Answer: (a) 2

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Question 53:
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

Answer: (a) Group 1

Question 54:
An element X combines with oxygen to form an oxide XO. This oxide is electrically con¬ducting. Write the formula of the compound formed when X reacts with chlorine.
(a) XCl₃
(b) XCl
(c) XCl₂
(d) XCl₅

Answer: (c) XCl₂