12th class (Fsc) Chemistry unit 2 MCQs
chapter 2 MCQs 12th Class Chemistry
S-Block Elements:
1. Elements of group I A are called:
a. Alkaline-earth metals
b. Alkali metals
c. Inert gases
d. Halogens
2. Dolomite is an ore of:
a. Barium
b. Strontium
c. Potassium
d. Magnesium
3. Which element form an ion with +3 charge?
a. Carbon
b. Berillium
c. Silicon
d. Aluminium
4. Which is not an alkali metal?
a. Rubidium
b. Francium
c. Radium
d. Caesium
5. Which element is not present abundant in the earth crust?5.
a. Sodium
b. Silicon
c. Oxygen
d. Aluminium
6. Asbestos is the mineral of:
a. Magnesium
b. Beryllium
c. Sodium
d. Potassium
7. The member of alkaline earth metal which is radioactive in nature?
a. Barium
b. Magnesium
c. Radium
d. Calcium
8. The name ‘Alkali’ is taken from language:
a. Greek
b. Arabic
c. Latin
d. English
9. Na may be donated by …… electron configuration notation.
a. [Ar] 4s-1
b. 1s.2s-1
c. None of these
d. [Ne]3s-1
10. CaMg3 (SiO3 ) is the composition of:
a. Calcite
b. Dolomite
c. Asbestos
d. Gypsum
11. Halite is chemical name of:
a. MgCI2
b. KCl
c. SrCI2
d. NaCl
12. Chemical formula of Barite is:
a. BaCI2
b. BaCO3
c. Ba(OH)2
d. BaSO4
13. Chemical formula of Epsom salt is:
a. MgSO4 .7H2O
b. MgSO3
c. MgSO4 .2H2O
d. MgSO4
14. For which one of the following minerals, the composition given is incorrect:
a. Borax.Na2B4O7.7H2O
b. Soda ash-NaaCO3
c. Glauber’s saltNa2SO4.10H2O
d. Carnalite.KCL.MgCL.6H2O
15. Which one of the following compounds has maximum covalentm character:
a. NaCl
b. LiF
c. CsCI
d. LiCl
16. Which product is formed when acetylene is passed over sodium:
a. NaOH
b. CO2 and H2 gases
c. C2H4
d. Sodium acetylide
17. Which one compound of lithium is more ionic?
a. Li2 CO3
b. LiOH
c. Li3 .PO4
d. LiF
18. When burnt in air, Li forms:
a. Superoxide
b. Normal oxide
c. Amphoteric oxide
d. Peroxide
19. The carbonates and nitrates of alkali metals except Li are:
a. Volatile liquids
b. Stable
c. Volatile solids
d. Unstable
20. Li reacts with H2 to form:
a. Lithium nitrate
b. Lithium nitride
c. Lithium
d. None of these
21. Alkali metals excepts Li react with N2 to form:
a. Nitrates
b. Nitrides
c. Do not react
d. Nitrites
22. Be reacts with alkalies to give:
a. Nitrogen gas
b. Oxygen gas
c. Water
d. Hydrogen gas
23. Alkaline earth metals except Be reacts with alkalies to give:
a. Nitrogen gas
b. Oxygen gas
c. Water
d. Hydrogen gas
24. Lithium shows properties which are different from other members of the same group because of its?
a. Less metallic
b. Small size
c. Hugh charge density
d. All of above
25. Which more is more soluble in water?
a. Ba(OH)2
b. HBO2
c. Be(OH)2
d. All of these