Question # 1

Which raw material is used for manufacture eof HNO3 by Birkland eyed process

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NH3 and CO2

Air

Air and gypsum

Lime stone and urea

In group VA elements the most electronegative elements is.

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Sb

N

P

As

Arsenic impurities in contact process are removed.

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By prolong heating the gases

By treatment with Fe(OH)3

In scrubbing tower

In absorption tower

An element has oxidation state -2, +4, +6 in its compounds. In which group in the periodic table is this element likely to be.

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Grooup III A

Group IV A

Group V A

Group VI A

The most electronegative element of group V-A is

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N

P

Sb

Bi

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.

Each of the following is true for white and red phosphorus except one.

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Both are soluble in CCl4

Both can be oxidized by heating in air

Both consists of same kind of atoms

Both can be converted into each other

Which metal is redered passive by HNO₃due to formation of a film of metal oxide over the metal

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Pt

Sn

CO

Mn

Which of the following is a reddish brown gas

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N₂O₃

NO₂

N₂O₃

N₂O₅

Which catalyst is used in contact process

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Fe₂O₃

V₂O₅

SO₃

Ag₂O

Which catalyst is used in contact process.

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Fe2O3

V2O5

SO3

Ag2O

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

In which substance phosphorus is not present.

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Yolk of egg

Bones

Apatite

Galena

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

In group V-A elements the most electronegative elements is

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Sb

N

P

As

The oxidation of NO in air produces

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N₂O₃

NO₂

N₂O₃

N₂O₄

Which of the following acids possess oxidizing and reducing properties.

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HCl

HNO2

HNO3

H2SO4

Which one of the following oxide is brown in colour.

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NO

NO2

N2O

N2O3

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