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Class 10 Science Chemistry Chapter 5 MCQ With Answers
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Chemistry Class 10 Chapter 5 MCQs on Periodic Classification of Elements
Question 1.
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.
Answer
Answer: (c) Valence
Question 2.
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.
Answer
Answer: (b) decreases
Question 3.
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
Answer
Answer: (d) 2nd group
Question 4.
In modern periodic table, elements are arranged according to their
(a) atomic weight
(b) density
(c) atomic number
(d) melting point
Answer
Answer: (c) atomic number
Question 5.
In which group are inert elements placed? ‘
(a) Group 8
(b) Group 10
(c) Group 1
(d) Group 18
Answer
Answer: (d) Group 18
Question 6.
Which of the following sets of atomic number belong to that of alkali metals?
(a) 1, 12, 30, 4, 62
(b) 37, 19, 3, 55
(c) 9, 17, 35, 53
(d) 12, 20, 56, 88
Answer
Answer: (b) 37, 19, 3, 55
Question 7.
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
Answer
Answer: (b) Metalloid
Question 8.
The amount of energy released when one or more electrons is added to the neutral atom is
(a) electron affinity
(b) ionisation energy
(c) electron negativity
(d) atomicity
Answer
Answer: (a) electron affinity
Question 9.
The valence shell of element A contains 3 electrons while the valence shell of element B contains 6 electrons. If A combines with B, the probable chemical formula of the compound is
(a) AB2
(b) A2B
(c) A2B3
(d) A3B2
Answer
Answer: (c) A2B3
Question 10.
Arrange the following elements in the 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
Answer: (b) Li < Be < C < O < F
Question 11.
What type of oxide would E&a-aluminium form?
(a) EO3
(b) E3O2
(c) E2O3
(d) EO
Answer
Answer: (c) E2O3
Question 12.
Which of these belong to the same period?
(a) A, B
(b) B, C
(c) C, A
(d) A, B & C
Answer
Answer: (b) B, C
Question 13.
Which of the following property will be common in group 1 elements?
(a) Mass number
(b) Number of protons in nucleus
(c) Atomic number
(d) Number of valence electrons
Answer
Answer: (d) Number of valence electrons
Question 14.
Which one of the following elements exhibit maximum number of valence electrons?
(a) Na
(b) Al
(c) Si
(d) P
Answer
Answer: (d) P
Question 15.
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
Answer
Answer: (d) F, O, N
Question 16.
Element ‘A’ has electronic configuration 2, 7; ‘B’ has electronic configuration 2, 8, 5 and ‘C’ has electronic configuration 2, 8, 7. Which two elements will exhibit similar chemical properties?
(a) A and C
(b) A and B
(c) B and C
(d) None of these
Answer
Answer: (a) A and C
Question 17.
Which of the following elements does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
Answer
Answer: (b) F
Question 18.
Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic masses
(ii) Isotopes of an element have same atomic number
(iii) Isotopes of an element show same physical properties
(iv) Isotopes of an element show same chemical properties
(a) (i), (iii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer
Answer: (b) (ii), (iii) and (iv)
Question 19.
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
Answer: (b) Group 4
Question 20.
Which of the following properties does not match element of the halogen family?
(a) They have seven electrons in their valence shell.
(b) They are highly reactive.
(c) They are metallic in nature.
(d) They are diatomic in their molecular form.
Answer
Answer: (c) They are metallic in nature.
Question 21.
Upto which element, the Law of Octaves was found to be applicable.
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium
Answer
Answer: (b) Calcium
Question 22.
According to Medeleev’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
Answer
Answer: (c) increasing atomic masses
Question 23.
Consider the following elements:
20Ca, 8O, 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
Answer: (d) 8O and 16S
Question 24.
The electronic configuration of the atom of an element X is 2, 4, 8. In the modern periodic table, the element X is placed in:
(a) 2nd group
(b) 4th group
(c) 14th group
(d) 8th group
Answer
Answer: (c) 14th group
Question 25.
Which of the following element would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
Answer
Answer: (c) K
Question 26.
The element A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
(a) A and B
(b) B and D
(c) A and C
(d) D and E
Answer
Answer: (c) A and C
Question 27.
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 electrons
(d) Shells in the atoms
Answer
Answer: (c) Valence electrons
Question 28.
The Newlands Law of Octaves for the classification of elements was found to be applicable only up to the element
(a) Potassium
(b) Calcium
(c) Cobalt
(d) Thorium
Answer
Answer: (b) Calcium
Question 29.
An element X forms an oxide X^g. In which group of Modem periodic table is this element placed?
(a) Group 2
(b) Group 3
(c) Group 5
(d) Group 13
Answer
Answer: (b) Group 3
Question 30.
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
Answer: (c) K
Question 31.
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
Answer: (b) Group 18
Question 32.
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
Answer: (c) L shell
Question 33.
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
Answer: (c) The atoms lose their electrons more easily
Question 34.
The longest period of the Modern Periodic Table is period.
(a) first
(b) second
(c) fourth
(d) sixth
Answer
Answer: (d) sixth
Question 35.
The inert gas which lies in third period is
(a) Helium
(b) Neon
(c) Argon
(d) Xenon
Answer
Answer: (c) Argon
Question 36.
An element with atomic number 40 is placed in period.
(a) 5
(b) 6
(c) 4
(d) 3
Answer
Answer: (a) 5
Question 37.
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
Answer: (c) 210
Question 38.
The element with atomic number 26 will be found in group
(a) 2
(b) 8
(c) 6
(d) 10
Answer
Answer: (b) 8
Question 39.
Eka-aluminium and Eka-silicon are known as
(a) gallium and germanium
(b) aluminium and silicon
(c) iron and sulphur
(d) neutron and proton
Answer
Answer: (a) gallium and germanium
Question 40.
When an atom of iodine becomes an iodine ion (I–) the radius will
(a) decrease
(b) increase
(c) remain the same
(d) none
Answer
Answer: (b) increase
Question 41.
Which type of elements are poor conductors of heat and electricity?
(a) Metals
(b) Non-metals
(c) Gases
(d) None of these
Answer
Answer: (b) Non-metals
Question 42.
What is the symbol of the element Tungsten?
(a) Tu
(b) W
(c) Ta
(d) Tw
Answer
Answer: (b) W
Question 43.
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
Answer: (d) 126
Fill in the blanks
I am the Modern Periodic Table, where elements are arranged on the basis of ……………. I have horizontal rows called ……………. and ……………. vertical columns are called ……………. My first period is very short with ……………. elements and second and third periods contain ……………. elements, fourth and fifth ……………. has ……………. elements. Sixth period has ……………. elements but seventh period is ……………. with space for more elements. 17 group is of ……………., 18 is of ……………. Atomic size of the elements ……………. across the period but ……………. down the group. Metallic character ……………. across the period but non-metallic character ……………. Number of valence electrons ……………. across the period and the valency ……………. but valency of the elements is ……………. in a group. All the properties of elements are the Periodic function of their …………….
Answer
Answer:
atomic number
seven
periods
eighteen
groups
two
eight
eighteen
thirty two
incomplete
halogen
noble gases
decreases
increases
decreases
increases
increases
first increases and then decreases
same
atomic number.
Match the following columns
1.
| Column I | Column II |
| (a) Highest electronegativity | (P) Caesium |
| (b) Highest electron affinity | (q) Ruthenium |
| (c) Highest electropositivity | (r) Fluorine |
| (d) Highest oxidation number | (s) Chlorine |
Answer
Answer:
| Column I | Column II |
| (a) Highest electronegativity | (r) Fluorine |
| (b) Highest electron affinity | (s) Chlorine |
| (c) Highest electropositivity | (P) Caesium |
| (d) Highest oxidation number | (q) Ruthenium |
2.
| Column I | Column II |
| (a) F | (p) Metallic oxide |
| (b) Na | (q) Noble gas |
| (c) Ne | (r) group 1, alkali metal |
| (d) Na2O | (s) Halogen, group-17 |
Answer
Answer:
| Column I | Column II |
| (a) F | (s) Halogen, group-17 |
| (b) Na | (r) group 1, alkali metal |
| (c) Ne | (q) Noble gas |
| (d) Na2O | (p) Metallic oxide |
3. The table given below shows a part of the periodic table.
| Column I | Column II |
| (a) P | (P) P |
| (b) Q | (q) Mg |
| (c) R | (r) Ne |
| (d) T | (s) O |
| (e) U | (t) Ar |
Answer
Answer:
| Column I | Column II |
| (a) P | (q) Mg |
| (b) Q | (s) O |
| (c) R | (r) Ne |
| (d) T | (P) P |
| (e) U | (t) Ar |
Complete the following crossword.
Across:
1. An element with atomic number 12.
3. Metal used in making cans and member of Group 14.
4. A lustrous non-metal which has 7 electrons in its outermost shell.
Down:
2. Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept under kerosene.
5. The first element of second Period.
6. An element which is used in making fluorescent bulbs and is the second member of Group 18 in the Modern Periodic Table.
7. An radioactive element which is the last member of halogen family.
8. Metal which is an important constituent of steel and forms rust when exposed to moist air.
9. The first metalloid in Modem Periodic Table whose fibres are used in making bullet-proof vests.
Answer
Answer:
Across:
1. Magnesium
3. Tin
4. Iodine
Down:
2. Sodium
5. Lithium
6. Neon
7. Astatine
8. Iron
9. Boron
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Class 10 Science Chemistry MCQ With Answers