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mnsoomro
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P2O5 is a hygroscopic powder which sublimes at______________?
A. 260°C B. 360°C C. 630°C D. 620°C Submitted by :- Jamil Ahmed
Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________?
A. Phosphine B. Phosphorus C. Water D. Phosphorus pentoxide Submitted by :- Jamil Ahmed
Acetic anhydride can be obtained by treating ethyl alcohol with___________________?
A. P2O5 B. H2SO4 C. Both A and B D. PCI5 Submitted by :- Jamil Ahmed
Allotropic form of phosphorus that is poisonous is___________________?
A. White B. Red C. Black D. Violet Submitted by :- Jamil Ahmed
The element of group VIA are called as ________________?
A. Halogens B. Chalcogens C. pnictogens D. none of them E. all of them Submitted by :- Jamil Ahmed
Which one of the following compounds usually smells like garlic ?
A. P2O3 B. P2O5 C. H3PO3 D. All have same smell Submitted by :- Jamil Ahmed
The composition of brown ring in nitrate test is_________________?
A. FeSO4.No B. FeSO4.No2 C. FeSO4.No3 D. FeSO4.N2o Submitted by :- Jamil Ahmed
Which one of the following is not the use of graphite ?
A. Lead pencils B. Abrasive C. Lubricant D. Electrode of electrolytic cell Submitted by :- Jamil Ahmed
Which of the following does not contain phosphorus ?
A. Yolk of egg B. Bone C. Nerves D. Steel Submitted by :- Jamil Ahmed
Which one of following is not a property of pure quartz ?
A. Colored solid B. Brittle C. Hard D. All of above Submitted by :- Jamil Ahmed