871. Aerosol is?
A. Suspended solid particles in the air
(B) Pollutant gas present in the air
(C) Microbes present in the air
(D) Greenhouse gas present in the air
872. The main source of carbon monoxide is?
(A) Fuel combustion
(B) Industrial process
C. Transportation
(D) Solid Waste disposal
873. In its reaction with silver nitrate, shows?
(A) Basic property
(B) Acidic property
(C) Reducing property
D. Oxidizing property
874. Earth’s atmosphere is an envelope of gases extending to a height of?
(A) 100 Km
(B) 150 Km
C. 200 Km
(D) 300 Km
875. Which of the following is caused by the higher concentration of Phosphorus and Nitrogen?
(A) Hardness
(B) Alkalinity
(C) Acidity
D. Eutrophication
876. The manufacture of iron from iron ore involves the process of?
(A) Fractional distillation
(B) Oxidation
C. Reduction
(D) Electrolysis
877. The element cesium bears resemblance with?
A. Ca
B. Cr
C. Both of the above
D. None of the above
878. Downs cell is used to prepare?
(A) Sodium carbonate
(B) Sodium bicarbonate
C. Sodium metal
(D) Sodium hydroxide
879. Ammonia may be prepared by heating ammonium chloride with?
(A) Water
(B) NaCl
C. Aqueous sodium hydroxide
(D) H2SO4
880. Crystals of Na2CO3. 10H2O when exposed to air?
(A) Lose water and remain solid
B. Gain water and remain solid
C. Gain water and become a liquid
D. Remains unchanged
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