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| 1)Orthophosphoric acid has
one hydrogen atom attached toa phosphorus atom two hydrogen atoms attached to a phosphorus atom three hydrogen atoms attached to a phosphorus atom none of these None of the above |
| 2)The hypophosphorus acid is
monobasic dibasic tribasic neutral None of the above |
| 3)Phosphorus exists in nature
in free state as phosphates as phosphoric acid as phosphorus pentoxide None of the above |
| 4)The ore used in the extraction of phosphorus by the modern electric process is
bone ash rock phosphate phosphoric acid none of these None of the above |
| 5)White phosphorus is
a good conductor of electricity a non conductor of electricity a feeble conductor none of these None of the above |
| 6)Red phosphorus
dissolves in water dissolves in carbon disulphide dissolves in both liquids does not dissolve in both liquids None of the above |
| 7)A match head contains
white phosphorus scarlet phosphorus black phosphorus none of these None of the above |
| 8)Which of the following mineral contain phosphorus
Phosphorite Galena Chalcopyrites none None of the above |
| 9)The element which exhibits the phenomenon of allotropy is
phosphorus silicon carbon nitrogen None of the above |
| 10)An allotrope of phosphorus which does not exhibit phosphorescence is
red phosphorus white phosphorus both none None of the above |
| 11)Red phosphorus is
solube in water soluble carobn disulphide insoluble in both liquids soluble in both liquid None of the above |
| 12)When phosphorus is heated with concentrated nitric acid, it is oxidised to
phosphorus acid orthophosphoric acid hypophosphorus acid metaphosphoric acid None of the above |
| 13)Which of the following on heating to high temperature form phosphorus pentoxide
red phosphorus white phosphorus Scarlet phosphorus all the above None of the above |
| 14)Phosphine is a
gas liquid solid both gas and liquid None of the above |
| 15)The one which does not react with sodium hydroxide is
white phosphorus red phosphorus Both white and red phosphorus Neither white and red phosphorus None of the above |
| 16)Superphosphate consists of
Calcium dihydrogen phosphate and calcium sulphate calcium phosphate and calcium sulphate calcium sulphate and calcium dihydrogen phosphite calcium sulphate None of the above |
| 17)Ore used in the extraction of phosphorous by the modern electric process is
bone ash rock phosphate phosphoric acid none of these None of the above |