Question # 1

PCl3 reacts with water to form

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PH3

POCl3

H3PO4

H3PO5

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

Most likely product formed when formic acid is dehydrated in the presence of conc. H2SO4 is.

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CO2 and H2O

CO, CO2 and H2O

CO2 and H2

CO and H2O

Which allotrope of phosphorus has layers like graphite.

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white phosphorus

Red phosphorus

Black Phosphorus

Amorphous phosphorus

The oxidation of NO in air produces

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N₂O₃

NO₂

N₂O₃

N₂O₄

Which of the following gives acidic oxide

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N

As

Sb

Bi

The element which is present in earth crust about 50% is

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Oxygen

sulphur

Carbon

Nitrogen

Out of all the elements of group VA, the highest ionization energy is possessed by

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N

As

Sb

Bi

NO2 can be obtained by heating.

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NaNO3

KNO3

Pb(NO3)2

NH3NO3

Out of all the elements of groups VI-A the highest melting and boiling points is shown by the element

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Te

Se

S

Po

Which catalyst is used in contact process.

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Fe2O3

V2O5

SO3

Ag2O

Basicity of ortho phosphoric acid is.

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1

2

3

4

What are the number of the electrons in valence shell of P in PCl3

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4

6

8

10

Which element does not have allotropic form

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Nitrogen

Phosphorous

Arsenic

Antimony

Bone ash contain calcium phosphate

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40%

50%

70%

80%

In pyrite burner, the gas produced is.

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SO3

SO2

CO2

NO

Which one of the following oxide is brown in colour.

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NO

NO2

N2O

N2O3

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

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