Related Questions

The most reactive allotropic form of phosphorus is __________ phosphorus.
A Red
B Yellow
C Violet
D Black
Which one of the following forms of phosphorus is most reactive?
A Black phosphorus
B White phosphorus
C Violet phosphorus
D Red phosphorus
Which among the following is white phosphorus?
A P1
B P6
C P4
D P5
Atomic number of which of the following elements is greater than that of Phosphorus?
A Aluminium
B Silicon
C Chlorine
D Magnesium
The main reserves of phosphorus in the biosphere is in the-
A hydrosphere
B atomosphere
C lithosphere
D troposphere
Phosphorus is kept in water because
A its ignition temperature is very high
B its ignition temperature is very low\
C its critical temperature is high
D its critical temperature is low
White phosphorus is generally kept under
A Alcohol
B Water
C Glycerine
D Kerosene oil
White phosphorus is always kept under
A Benzene
B Kerosene
C Ether
D Water
What is the atomicity of phosphorus?
A Monoatomic
B Tetra-atomic
C Diatomic
D Poly-atomic
The addition of lead, sulphur and phosphorus to low carbon steels, help to
A Reduce built up edge
B Break up chips
C Improve machinability
D All of these

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