1. Naturally occuring metallic compounds are called as

a. ore
b. gangue
c. mineral
d. rock

c. mineral

2. The separation of minerals from gangue is called concentration. Which of following method is used for concentration

a. smelting
b. roasting
c. refining
d. flotation

d. flotation

3. Which of the following steps is not used in extraction process of metals

a. flotation
b. roasting
c. smelting
d. bessemerization

d. bessemerization

4. In electrolytic refining of copper ,…… is used an anode

a. pure copper
b. impure copper
c. copper sulphate
d. eletrolytic tank

b. impure copper

5. Which of following is not a raw material for manufacturing of soda ash

a. ammonia
b. carbon monoxide
c. brine
d. lime stone

b. carbon monoxide

6. A mixture of Cu2S and FeS called matte is produced in one of the metallurgical operations in the extraction of copper. The name of this operation is

a. smelting
b. roasting
c. bessemerization
d. electro-refining

b. roasting

7. Chemical formula of slaked lime is

a. CaCO3
b. CaO
c. Ca(OH)2
d. CaCl2

c. Ca(OH)2

8. Calcination is the process in which sodium hydrigen carbonate is heated to get sodium carbonate.Which is not obtained in this process

a. CO2
b. Na2CO3
c. CO
d. H2O

c. CO

9. Percentage of Nitrogen in urea is

a. 35%
b. 21.2%
c. 80%
d. 46.6%

d. 46.6%

10. What happen when ammonium carbamate is distilled with steam

a. ammonia is produced
b. carbon dioxide is released
c. urea is produced
d. urea solution is produced

c. urea is produced