Question # 1

Which allotrope of phosphorus has layers like graphite.

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white phosphorus

Red phosphorus

Black Phosphorus

Amorphous phosphorus

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 element does not have allotropic form

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Nitrogen

Phosphorous

Arsenic

Antimony

Lowest oxidation state of nitrogen is present in.

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NH3

NO2

NO

HNO3

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

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Mg (OH)2

Mg

MgO

Mg(NO3)2

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.

Maximum number of unpaired electrons is in

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O₂

O₂⁺

O₂^-

O₂^2-

In pyrite burner, the gas produced is.

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SO3

SO2

CO2

NO

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

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

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N

As

Sb

Bi

The most electronegative element of group V-A is

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N

P

Sb

Bi

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

The brown gas formed when metal reduces HNO₃

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N₂O₅

N₂O₃

NO₂

NO

SO2 is not absorbed in water directly to form H2SO4 because.

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The reaction does not go to completion

The reaction is quite slow

The reaction is exothermic

SO3 is insoluble in water

Which one of the following oxide is brown in colour.

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NO

NO2

N2O

N2O3

The reaction between Cu and conc. H2SO4 produces

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SO3

SO2

H2

Cu + ions

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

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

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O2

O2+

O2-

O2^-2

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

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N2O

NO

NO2

N2O5

Basicity of ortho phosphoric acid is.

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1

2

3

4

Bone ash contain calcium phosphate

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40%

50%

70%

80%

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

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

In group V-A elements the most electronegative elements is

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Sb

N

P

As

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

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