12th class (Fsc) Chemistry unit 1 MCQs
chapter 1 MCQs 12th Class Chemistry
Periodic Classification Of Elements And Periodicity:
1. How many elements were arranged by Newland?
a. 72
b. 52
c. 62
d. 42
2. When dobereiner, a German chemist proposed trides?
a. 1859
b. 1819
c. 1839
d. 1829
3. Which statement about a triad is incorrect?
a. Atomic mass of any elements is equal to average of atomic masses of other elements
b. Consist of three elements
c. Atmoic mass of middle element is equal to average of atomic masses of other elements
d. Elements have same properties
4. When Newland an English chemist, proposed Law of Octaves?
a. 1874
b. 1864
c. 1844
d. 1854
5. Which statement is incorrect about law of octaves?
a. Every 8thelement similar in properties with first one
b. Elements are arranged in increasing order of atomic masses
c. Every eight element is present above first element
d. Each horizontal row contains seven elements
6. When Dimitri Mendeleev, a Russian chemist proposed Periodic Law?
a. 1871
b. 1851
c. 1881
d. 1861
7. Dobereiner, a Garman chemist in 1829 arranged similar elements into groups of three, called:
a. Thrice
b. Threads
c. Tetrads
d. Triads
8. Newland arranged the elements in order of their increasing atomic masses and he observed that properties are repeated after every:
a. 8th element
b. 6th element
c. 9th element
d. 7th element
9. The Law of Octaves was rejected with discovery of:
a. Alkali metals
b. Halogens
c. Heavy metals
d. Inert gases
10. Uniqueness of Mendeleec’s periodic table is that he:
a. Classified melements into 12 periods
b. Determined atomic masses of elements
c. Left empty spaces for undiscovered elements
d. Placed Na, K with Ca and Mg
11. f.block elements are also called:
a. Inner transition elements
b. Non-typical transition elements
c. Normal transition elements
d. Outer transition elements
12. The number of elements in fourth period of periodic table is:
a. 10
b. 32
c. 8
d. 18
13. What is the numbers of elements in Lanthanide series?
a. 10
b. 2
c. 14
d. 6
14. The elements in which d electrons are responsible for their valency are called:
a. f-block elements
b. s-block elements
c. d-block elements
d. p-block elements
15. d and f-block elements are called:
a. Transition elements
b. Alkali
c. Alkaline earth metals
d. None of these
16. The elements of the IA & IIA subgroups belongs to:
a. f-block
b. s-block
c. d-block
d. p-block
17. The elements of the IIIA & VIIIA subgroups belong to:
a. f-block
b. s-block
c. d-block
d. p-block
18. In the perodic table the elements of sub-group A are called:
a. Normal elements
b. Transition elements
c. Rare earth elements
d. Inert elements
19. The elements in modern periodic table have been divided into blocks:
a. Five
b. Two
c. Three
d. Four
20. The total number of elements in S-block is:
a. 14
b. 24
c. 04
d. 34
21. Which period is incomplete?
a. IV
b. V
c. IV
d. VII
22. Actinid series ends at:
a. Lr
b. Bk
c. Cf
d. Es
23. Where are the s-block elements are located in modern periodic table?
a. Middle
b. Left side
c. Bottom
d. Right side
24. What is location of p-block elements in modern periodic table?
a. Middle
b. Bottom
c. Right side
d. Left side
25. What is location of d-block elements in modern periodic table?
a. Left side
b. Middle
c. Bottom
d. Right side