Related Questions

Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
A 50-80
B 250-400
C 1000-1200
D 800-900
The most stable allotropic form of phosphorous is the __________ phosphorous.
A White
B Black
C Yellow
D Red
Red phosphorous is changed into white phosphorous by
A Heating in presence of light
B Melting under pressure
C Vaporisation followed by condensation
D None of these
Both white phosphorous as well as red phosphorous
A Are soluble in CS2
B Burns when heated in air
C Reacts with hot caustic soda solution to give phosphine
D All of the above
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
A Foaming
B Odour nuisances
C Undesirable plant growth
D Turbidity
Higher concentration of nitrogen dioxide in atmosphere air causes
A Cancer
B Bronchitis
C Asphyxiation
D Corrosion
Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?
A Exact concentration of solution is not given
B Character of semi permeable membrane is not given
C The flow of solution is not possible through semi permeable membrane
D All are incorrect
High amount of sulphur and phosphorous in coke causes
A Decrease in its calorific value
B Increase in its strength
C Brittleness of steel made by using it
D None of these
The molecular formula of phosphorous is
A P1
B P2
C P3
D P4
Most of the phosphorous present in the blast furnace burden enters into
A Hot metal
B Flue gases
C Slag
D Refractory lining

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