1. Which one of the following is not an ore of aluminum?
(A) Bauxite
(B) Corundum
(C) Cryolite
(D) Epsomite
2. Aluminum metal is purified by:
(A) Hoee’s process
(B) Baeyer’s process
(C) Serpeck’s process
(D) Hall’s process
3. In the alumino-thermite process, Al acts as:
(A) An oxidizing agent
(B) A flux
(C) A reducing agent
(D) Solder
4. Symbol of aluminum is:
(A) Fe
(B) Al
(C) Cr
(D) Cu
5. Formula of alumina is:
(A) None of these
(B) Cu₂O
(C) Na₃AlF
(D) Al₂O₃
6. Aluminum is the _____ largely available naturally occurring element:
(A) Third
(B) Second
(C) First
(D) Fourth
7. Color of aluminum is:
(A) Reddish
(B) Brown
(C) Silver white
(D) Greenish
8. Melting point of aluminum is:
(A) 558°C
(B) 858°C
(C) 758°C
(D) 658°C
9. Formula of bauxite is:
(A) Cu₂O
(B) Al₂O₃
(C) Na₃AlF
(D) FeCr₂O₄
10. Aluminum is extracted mostly from ore:
(A) Bauxite
(B) Mica
(C) Alunite
(D) Cryolite
11. Pure aluminum is obtained from:
(A) Electrolysis
(B) Sublimation
(C) Filtration
(D) Crystallization
12. Most of the aluminum is extracted by:
(A) Clerk process
(B) Hall process
(C) Open hearth process
(D) Heber’s process
13. How bauxite is cleaned?
(A) Open hearth
(B) Bayer
(C) Solvay
(D) Clark’s
14. Aluminum is a metal:
(A) Heavy
(B) Weak
(C) Light
(D) None of these
15. One of the important ore of aluminum:
(A) Alumite
(B) Bauxite
(C) Cryolite
(D) Feldspar
16. Al(OH)₃ is:
(A) Acidic
(B) Basic
(C) Neutral
(D) Amphoteric
17. From electric furnace the obtained aluminum is:
(A) 90%
(B) 99%
(C) 98%
(D) 95%
18. Thermite process is discovered by:
(A) Hall
(B) Goldsmith
(C) Brown
(D) Bush
19. Which metal is ductile and malleable?
(A) Aluminum
(B) Antimony
(C) Bismuth
(D) Graphite
20. Aluminum is used for:
(A) Garments
(B) Sports
(C) Bullets
(D) Window frame