Question # 1

The brown gas formed when metal reduces HNO₃

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N₂O₅

N₂O₃

NO₂

NO

Which one is metaphosphoric acid

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HPO3

H3PO3

H3PO4

H4P2O7

Oxidation of NO in air produces

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N₂O

N₂O₃

N₂O₄

N₂O₅

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

In group V-A elements the most electronegative elements is

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Sb

N

P

As

The reaction between Cu and conc. H2SO4 produces

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SO3

SO2

H2

Cu + ions

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

Basicity of ortho phosphoric acid is.

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1

2

3

4

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

Which one of the following group of Periodic table called chalcogen family.

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Group III A

Group VA

Group VI A

Group VII A

In pyrite burner, the gas produced is.

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SO3

SO2

CO2

NO

In which substance phosphorus is not present.

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Yolk of egg

Bones

Apatite

Galena

Bone ash contain calcium phosphate

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40%

50%

70%

80%

In aqua regia, the ratio of conc. HCl to Conc. HNO3 is

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1 : 1

2 :1

1:2

3 : 1

Which catalyst is used in contact process.

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Fe2O3

V2O5

SO3

Ag2O

P2O5 is usually used as

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Drying agent only

Reducing agent

Both drying and reducing agent

Both drying agent and oxidizing agent.

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