Question # 1

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.

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 reaction between Cu and conc. H2SO4 produces

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SO3

SO2

H2

Cu + ions

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

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

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N2O

NO

NO2

N2O5

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

The most electronegative element of group V-A is

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N

P

Sb

Bi

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

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

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

Laughing gas is chemically

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NO

NO₂

N₂O

N₄O₄

Out of all the elements of Group V-A the highest ionization energy is possessed by

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N

P

Sb

Bi

What is %age of calcium phosphate in bone ash

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20

40

80

60

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 catalyst is used in contact process

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Fe₂O₃

V₂O₅

SO₃

Ag₂O

The reaction between concentrated H2SO4 and glucose give carbon and water. In this reaction H2SO4 acts as.

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An acid

An oxidising agent

Dehydrating agent

A reducing agent

Which statement is incorrect about H2SO4

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Dehydration agent

dibasic acid

Oxidizing agent

Reducing agent

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

In pyrite burner, the gas produced is.

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SO3

SO2

CO2

NO

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

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O2

O2+

O2-

O2^-2

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

In group VA elements the most electronegative elements is.

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Sb

N

P

As

NO2 can be obtained by heating.

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NaNO3

KNO3

Pb(NO3)2

NH3NO3

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