Entry Test MCQ :: Group VA and VIA Elements

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21.

Which of the elements show passivity when treated with conc. HNO3.

A.	Fe	B.	A?
C.	Cr	D.	All of the above

22.

Which allotropic form of phosphorous is the most stable?

A.	White	B.	black
C.	red	D.	Violet

23.

The gas which cannot be dried by conc. H2SO4

A.	SO2	B.	H2S
C.	CO2	D.	C2H4

24.

The chemical composition of cinnabar is

A.	ZnS	B.	PbS
C.	HgS	D.	FeS

25.

FeSO4 forms brown ring with

A.	N2O3	B.	NO2
C.	NO	D.	N2O

26.

Oxygen and sulphur resemble in all except

A.	Electronic conviguration of valence shell electrons	B.	Show allotropy
C.	Polymeric	D.	Show same oxidation state

27.

Oxygen does not react with all except

A.	Alkali	B.	Acid
C.	Water	D.	Metals

28.

Arsenic oxides are removed by passing through

A.	Ferric hydroxide	B.	Sodium hydroxide
C.	Calcium hydroxide	D.	Aluminium hydroxide

29.

In which compound nitrogen has maximum oxidation state

A.	N2O	B.	NO2
C.	HNO2	D.	HNO3

30.

When sulphuric acid is treated with ethanol sulphuric acid behaves like

A.	an acid	B.	a dehydrating agent
C.	an oxidizing agent	D.	as sulphonating agent