Related Questions

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
A Coagulation and flocculation of colloids
B Oxidation of carbonaceous matter to CO2
C Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate
D All of the above
Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
A Alumina
B Platinum
C Vanadium pentoxide
D Iron oxide
The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent.
A 60
B 30
C 95
D 100
Tea worth tk. 126 per kg and Tk.135 per kg are mixed with a third variety in the ratio 1:1:2. If the mixture is worth tTk.153 per kg,The price of third variety per kg will be:
A Tk. 169.50
B Tk 170
C 175.50
D 180
Tea worth Tk. 165 per kg and Tk. 135 per Kg are mixed with a variety in the ratio 1 : 1 : 2. If the mixture is worth Tk. 153 kg, the price of the third variety per kg will be:
A 169.50
B 170
C 175.50
D 180
Tea worth Tk. 126 per kg and Tk. 135 per kg are mixed with a third variety in the ratio 1:1:2. If the mixture is worth Tk. 153 per kg, then the price of third variety per kg will be:
A Tk. 169.5
B Tk. 170
C Tk.175.50
D Tk. 180
Ceramic compounds as compared to metallic compounds
A Crystallise faster
B Resist greater tensile stress at room temperature
C Have higher melting temperature
D Are better conductor of electricity at higher temperature
Nitrogen compounds are not used in the manufacture of
A Fertilisers
B Gun powder
C Tip of match sticks
D Explosive
In organic compounds, nitrogen is estimated by
A Carius method
B Victor-Meyer's method
C Liebig's method
D Dumas method
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has
A High bond dissociation energy
B Smaller atomic radius
C Stable half filled 2p sub level
D High nuclear charge

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