CBSE Class 9 Science Periodic Classification of Elements MCQs Set A

PERIODIC CLASSIFICATION OF ELEMENTS

 
1. Dobereiner, in 1829, pointed out that when elements are arranged in the order of increasing relative atomic masses, in a triad, the relative atomic mass of the middle element was approximatery equal to the mean of the relative atomic masses of the first and third elements. Name the element which is in between the elements calcium and barium :
(A) Beryllium
(B) Magnesium
(C) Strontium
(D) Iodine
 
2. The third member of the Dobereiner triad consisting of lithium and sodium is :
(A) Potassium
(B) Hydrogen
(C) Boron
(D) Barium
 
3. If the two members of a Dobereiner triad are chlorine and iodine, the third member of this triad is :
(A) Fluorine
(B) Bromine
(C) Sodium
(D) Calcium
 
4. If the two members of a Dobereiner triad are sulphur and selenium, the third member of this triad is :
(A) Calcium
(B) Barium
(C) Strontium
(D) Tellurium
 
5. 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
 
6. Who gave the 'law of octaves'?
(A) Dobereiner (B) Lothar meyer (C) Mendeleef (D) Newlands
 
7. Lothar Meyer obtained the curve for the known elements plotting their atomic volumes against :
(A) Atomic numbers (B) Atomic masses
(C) Densities (D) Ionization energies
 
8. In Lothar Meyer plot, the peaks are occupied by :
(A) Alkali metals (B) Alkaline earth metals
(C) Halogens (D) Noble gases
 
9. According to Mendeleef periodic law, the properties of elements are periodic function of their :
(A) Atomic mass (B) Atomic numbers
(C) Atomic volumes (D) Densities
 
10. Mendeleef periodic table had no place for
(A) Alkali metals (B) Alkaline earth metals
(C) Halogens (D) Noble gases
 
11. The basis of the modern long form of the periodic table is :
(A) Atomic masses (B) Atomic number
(C) Atomic size (D) Atomic volume
 
12. The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all :
(A) Halogens (B) Noble gases (C) Noble metals (D) Light metals
 
13. In the periodic table :
(A) There are two elements in the first period
(B) There are eighteen elements in the third period
(C) The horizontal rows are called groups
(D) The vertical columns are called periods
 
14. How many periods are there in the long form of the periodic table?
(A) 6 (B) 7 (C) 8 (D) 9
 
15. Elements in the vertical group of the periodic table have generally the same :
(A) Atomic size
(B) Electronic configuration
(C) Number of electrons
(D) Number of electrons in the outermost shell of their atoms
 
16. 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
 
17. The elements with atomic numbers 4, 12, 20, 38 and 56 belong to :
(A) Alkali metals (B) Alkaline earth metals
(C) Halogens (D) Noble gases
 
18. 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
 
19. The atomic number of the element next to 16S in the same group is :
(A) 18 (B) 24
(C) 34 (D) 42
 
20. The atomic number of the element next to 53I in the same group is :
(A) 55 (B) 61
(C) 85 (D) 93
 
21. The atomic number of the element next to 2He in the same group is :
(A) 4 (B) 10
(C) 20 (D) 52
 
22. The elements belonging to IA to VIIA and 0 groups are known as :
(A) Alkali metals (B) Representative elements
(C) Transition elements (D) Inner-transition elements
 
23. The elements belonging to IIIB to VIII and IB and IIB are known as :
(A) Representative elements (B) Transition elements
(C) Lanthanides (D) Actinides
 
24. Each transition series contains a total of :
(A) 2 elements (B) 8 elements (C) 10 elements (D) 18 elements
 
25. The number of elements in each of the inner transition series is :
(A) 2 (B) 8 (C) 10 (D) 14


 CBSE Class 9 Science Periodic Classification of Elements MCQs Set A

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