A) White
B) Red
C) Scarlet
D) Violet
Correct Answer: A
Solution :
Red phosphorous| White Phosphorus or Yellow phosphorus | Red phosphorus | Black phosphorus | |
| 1. | Prepared by heating phosphate rock with silica & coke at 11770K in a electric furnace | White phosphorus \[\xrightarrow{525\,K}\] Red phosphorus | White P \[\xrightarrow{473\,K}\]Black phosphorus high pressure (inert atm) |
| 2. | Soft waxy solid can be cut with a knife | Hard red solid sp. gravity 2.1 | Exist in three crystalline and one amorphous form |
| 3. | Poisnous | non-poisnous | non-poisnous |
| 4. | Insoluble in \[{{H}_{2}}O\]but soluble in \[C{{S}_{2}}\] | Insoluble both in \[{{H}_{2}}O\]and \[C{{S}_{2}}\] | Insoluble in \[{{H}_{2}}O\]and \[C{{S}_{2}}\] |
| 5. | On contact with air it undergoes slow combustion and glow in dark (chemilumines cence) It is less stable and more reactive form of phosphorus | More stable and hemically less reactive as compared to white phosphorus due to polymeric structure. | It is most stable and least reactive form of phosphorus |
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