Entry Test MCQ :: Group VA and VIA Elements

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11.

Allotropic form of phosphorus that is poisonous is

A.	White	B.	Red
C.	Black	D.	Violet

12.

Which one of the following is not the use of graphite?

A.	Lead pencils	B.	Abrasive
C.	Lubricant	D.	Electrode of electrolytic cell

13.

Acetic anhydride can be obtained by treating ethyl alcohol with

A.	P2O5	B.	H2SO4
C.	Both a and b	D.	PCI5

14.

The composition of brown ring in nitrate test is

A.	FeSO4.No	B.	FeSO4.No2
C.	FeSO4.No3	D.	FeSO4.N2o

15.

Phosphorous acid upon thermal decomposition yields phosphoric acid and

A.	Phosphine	B.	Phosphorus
C.	Water	D.	Phosphorus pentoxide

16.

Which one of the following compounds usually smells like garlic?

A.	P2O3	B.	P2O5
C.	H3PO3	D.	All have same smell

17.

P2O5 is a hygroscopic powder which sublimes at

A.	260?C	B.	360?C
C.	630?C	D.	620?C

18.

The element of group VIA which is a non-metal is

A.	S	B.	Se
C.	Te	D.	Po

19.

Phosphoric acid is a weak acid and its basicity is

A.	1	B.	3
C.	zero	D.	2

20.

All the elements in group VIA are _______ in nature.

A.	hygroscopic	B.	metals
C.	polymeric	D.	all of above