Question # 1

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

Which catalyst is used in contact process.

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Fe2O3

V2O5

SO3

Ag2O

Which of the following gives acidic oxide

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N

As

Sb

Bi

The oxidation of NO in air produces

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N₂O₃

NO₂

N₂O₃

N₂O₄

Out of the elements of group VIA the highest melting and boiling points is shown by the element.

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Te

Se

S

Po

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

Role of H2S in the given chemical reaction is H2S + I2--------------- 2HI+S

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Oxidising agent

Reducing agent

Dehydrating agent

As an acid

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

The brown gas formed when metal reduces HNO₃

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N₂O₅

N₂O₃

NO₂

NO

The composition of oleum is.

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H2SO4

H2S2O3

H2S2O7

H2S3O7

Which of the following specie has the maximum number of unpaired electrons.

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O2

O2+

O2-

O2^-2

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

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

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

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N

P

Sb

Bi

In which substance phosphorus is not present.

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Yolk of egg

Bones

Apatite

Galena

When Cu reacts with conc. HNO3 , which one of the following gases is evolved

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N2O

NO

NO2

N2O5

Which one is metaphosphoric acid

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HPO3

H3PO3

H3PO4

H4P2O7

Which one of the following does not react with dilute sulphuric acid.

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Mg (OH)2

Mg

MgO

Mg(NO3)2

Which of the following acids possess oxidizing and reducing properties.

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HCl

HNO2

HNO3

H2SO4

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

Oxidation of NO in air produces

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N₂O

N₂O₃

N₂O₄

N₂O₅

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

In pyrite burner, the gas produced is.

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SO3

SO2

CO2

NO

When concentrated H2SO4 and solid sodium chloride react together at room temperature the product are.

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Two salts only

A salt and a base

A salt and an acid

A salt and water

Maximum number of unpaired electrons is in

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O₂

O₂⁺

O₂^-

O₂^2-

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