191. Matte is a mixture of?
(a) CuS and FeS
(b) Cu20 and FeS
(c) Cu2S and FeS
(d) Cu20 and FeO
192. The impurity present in mineral is called?
(a) Metal
(b) Gangue
(b) Ore
(d) Salt
193. All are the raw materials for the manufacturing of urea EXCEPT?
(a) CO2
(b) H20
(b) NH3
(d) NaCl
194. Percentage of nitrogen in urea is?
(a) 14
(b) 28
(c) 60
d) 46
195 .Blister copper is refined through?
(a) Concentration
(b) Smelting
(b) Reduction
(d) Electrolysis
196. What procedure results in the division of petroleum into various fractions?
(a) Simple distillation
(b) Fractional distillation
(b) Condensation
(d) Destructive distillation
197. FOR THE EXTRACTION OF METAL, ALL STEPS ARE USED, BUT?
(a) Roasting
(b) Evaporation
(b) Smelting
(d) Bessemerization
198. Sodium carbonate (Na2C03) is also known as?
(a) Washing soda
(b) Soda ash
(c) Both of these
(d) None of these
199. What of the following is a waterborne illness?
(a) Cholera
6) Typhoid fever
(b) Dysentery
(d) all of these
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