MCQ Questions for Class 10 Science Chapter 5 Periodic Classification of Elements with Answers
.jpeg)
1. An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
2. 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?
3. Which of the following set of elements is written in order of their increasing metallic character?
4. The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?
5. Which one of the following does not increase while moving down the group of the periodic table?
6. On moving from left to right in a period in the periodic table, the size of the atom
7. An atom of an element has the electronic configuration 2, 8, 2. To which group does it belong?
8. In modern periodic table, elements are arranged according to their
9. In which group are inert elements placed? ‘
10. Which of the following sets of atomic number belong to that of alkali metals?
11. 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?
12. The amount of energy released when one or more electrons is added to the neutral atom is
13. 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
14. Arrange the following elements in the order of their increasing non-metallic character. Li, O, C, Be, F
15. Newlands relation is called
16. Upto which element, the Law of Octaves was found applicable?
17. 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?
18. At the time of Mendeleev, the number of elements known was
19. The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element:
20. An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?
21. The arrangement of elements in the Modem Periodic Table is based on their
22. Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
23. Element ‘X’ forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
24. 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
25. Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br
26. What is the atomic number of element of period 3 and group 17 of the Periodic Table?
27. 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?
28. 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?
29. 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.
30. A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
31. Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
32. 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.
33. An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
34. 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?
😊😊😊
If you have any doubts, Please let me know