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Class 10 Science MCQs Chapter 5 Periodic Classification of Elements
1. Newlands relation is called
(a) Musical Law
(b) Law of Octaves
(c) Periodic Law
(d) Atomic Mass Law
Answer
Answer: b
2. Upto which element, the Law of Octaves was found applicable?
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium
Answer
Answer: b
3. 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
Answer
Answer: d
4. At the time of Mendeleev, the number of elements known was
(a) 63
(b) 65
(c) 62
(d) 64
Answer
Answer: a
5. The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element:
(a) Scandium
(b) Germanium
(c) Gallium
(d) Aluminium
Answer
Answer: c
6. An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?
(a) 4
th
group
(b) 6
th
group
(c) 3
rd
group
(d) 2
nd
group
Answer
Answer: d
7. 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
Answer
Answer: b
8. 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
Answer
Answer: c
9. Element ‘X’ forms a chloride with the formula XCl
2
, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
(a) Si
(b) Mg
(c) Al
(d) Na
Answer
Answer: b
10. Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
(a) A, B
(b) B, C
(c) C, A
(d) A, B and C
Answer/ Explanation
Answer: b
Explaination: Reason. B= 10 (2, 8), C = 5 (2, 3) Both have 2 periods.
11. 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
Answer
Answer: b
12. 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
Answer
Answer: c
13. 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
Answer
Answer: c
14. 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
Answer
Answer: d
15. 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
Answer
Answer: b
16. An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound.
(a) XY
2
(b) XY
(c) X
2
Y
(d) (XY)
2
Answer
Answer: a
17. A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
(a) MO
(b) M
2
O
(C) M2O
3
(d) MO
2
Answer
Answer: b
18. 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
Answer
Answer: b
19. 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) XCl
3
(b) XCl
(c) XCl
2
(d) XCl
5
Answer
Answer: c
20. 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/ Explanation
Answer: a
Explaination: Reason. e = 19 (2, 8, 8,1)
21. Consider the following elements
20
Ca,
8
Or
18
Ar,
16
S,
4
Be,
2
He
Which of the above elements would you expect to be in group 16 of the Periodic Table?
(a)
20
Ca and
16
S
(b)
20
Ca and
8
O
(c)
18
Ar and
16
S
(d)
8
O and
16
S
Answer
Answer: d
22. 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
Answer: b
23. 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
Answer: d
24. 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
Answer: d
25. 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/ Explanation
Answer: d
Explaination: Reason. Both have same number of valence electrons
Fill in the blanks
1. The concept of grouping elements into triads was given by ……… .
2. Mendeleev’s basis for the Periodic Table is ……… .
3. The basis for Modern Periodic Table is ……… .
4. (a) Metallic character ……… down the group.
(b) Atomic size ……… along the period.
(c) Electronegative character ……… down the group.
5. Isotopes belong to the same ……… in the Periodic Table.
6. Halogens belong to group ……… of the Periodic Table.
7. An element having electronic configuration (2, 8, 2) belongs to the ……… group.
8. Atoms of different elements with the same number of occupied shells are placed in the same ……… .
9. Valency of elements ……… and then ……… as we move across the period while it remains the same down the group.
10. Non-metals are located on the ……… side of the Periodic Table.
Answers
1. Dobereiner
2. atomic mass
3. atomic no.
4. (a) increases
(b) decreases
(c) decreases
5. position
6. 17
7. 12
th
8. Period
9. increases, decreases
10. right
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