1. Symbol of chromium is:
(A) Fe
(B) Al
(C) Cu
(D) Cr
2. Color of chromium is:
(A) Reddish
(B) Silver white
(C) Greenish
(D) Blackish grey
3. At 20°C thermal conductivity of chromium is:
(A) 80 W/m·K
(B) 70 W/m·K
(C) 85 W/m·K
(D) 91 W/m·K
4. Density of chromium is:
(A) 7.85
(B) 7.19
(C) 7.0
(D) 7.50
5. Formula of chrome iron is:
(A) FeO·Cr2O3
(B) Cr2O4
(C) Fe2O3·Cr2O3
(D) Cr2O3
6. Fe2O3·Cr2O3 is an alloy of:
(A) Chromium
(B) Copper
(C) Aluminum
(D) Iron
7. Ore of chromium is purified by:
(A) Froth flotation process
(B) Electromagnetic separation
(C) Gravity separation
(D) None of these
8. Furnace used to purify chromium is:
(A) Blast furnace
(B) Open hearth furnace
(C) Rotary furnace
(D) Electrical furnace
9. In rotary furnace temperature is maintained at:
(A) 300–600°C
(B) 600–900°C
(C) 900–1000°C
(D) 1400–1500°C
10. Compound used to treat ore in rotary furnace:
(A) NaCl
(B) CaO
(C) Na2CO3
(D) FeO
11. Chromium is extracted after reduction of chromic oxide:
(A) 99%
(B) 90%
(C) 95%
(D) 100%
12. Chromium is used in textile industry as:
(A) Catalyst
(B) Anodizing
(C) Mordant
(D) None of these
13. Formula of chromium oxide is:
(A) CrO
(B) All of these
(C) Cr2O4
(D) Cr2O3
14. In aircraft industry chromium is used as:
(A) Catalyst
(B) Mordant
(C) Anodizing
(D) Oxidizing
15. Chromite is an ore of:
(A) Aluminum
(B) Iron
(C) Copper
(D) Chromium
16. Used in paint manufacturing:
(A) Dichromate
(B) Oxide chromium
(C) Lead chromite
(D) Chromium oxide
17. Formula of chromite is:
(A) FeCr2O4
(B) K2CrO4
(C) PbCrO4
(D) Cr2O3
18. Cr2O3 is an ore of:
(A) Aluminum
(B) None
(C) Nickel
(D) Chromium
19. Chromium is used in making of:
(A) Polymer
(B) Hard wooden
(C) (incomplete option in paper)
(D) None of these
20. Chromium is used in:
(A) Paints
(B) Polishes
(C) None
(D) Both