Question # 1

Nitrogen is present in atmosphere by weight:

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75%

76%

77%

78%

Colour of PCl₅is:

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Red

Yellowish White

Grey

Colourless

Aqua Regia has ration of conc. HCl and HNO₃.

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1 : 2

1 : 3

1 : 4

2 : 3

All elements of group VI-A non-metal except

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Te

S

Se

Po

Which can be prepared from HNO₃?

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T.N.T

Fertilizers

Picric acid

All of these

Out of all the elements of group VI-A the highest melting and boiling points is shown by the elements:

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Te

Se

S

Pb

What are non-metals?

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Sb & Bi

P & Bi

N & P

As & N

Sulphuric acid is used

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As fertilizers

As dehydrating agent

As oxidizing agent

All above

Structure of P₄ is

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Trigonal

Tetragonal

Hexagonal

Monoclinic

SO₃ is not absorbed in water directly to or 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.

Ring testis given by ions.

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Nitrides

Nitrates

Cyanates

Nitriles

Calcium carbonates contains oxygen in it:

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48%

50%

53%

60%

Which of the following species has the maximum number of unpaired electrons?

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O₂

O₂⁺

O₂^-

O₂^-2

Which property is not present in non-methals

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Predominantly covalent

Poor conductor

Hig E.N. value

High electropositivity

Which are metalloid?

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Nitrogen and phosphorous

Arsenic and phosphorous antimony

Phosphorous and arsenic

Antimony and bismuth

Tungsten and Uranium are turned to an reaction with HNO₃:

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Oxides

chlorides

Nitrides

Nitrates

Allotropic forms of sulpher are

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Two

Three

Four

Five

Group VI-A elements are called:

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Halogens

Electron deficient

alkaline earth metal

Chalcogens

Specific gravity of HNO₃ is

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1.35

1.53

1.39

1.93

Which is nitrous acid?

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HNO₃

HNO

HNO₂

H₂NO₃

Which phosphorus is the most poisonous?

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White

Red

Black

All

Among group V-A elements, the most electronegative element is

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Sb

N

P

As

Nitrogen is present in atmosphere

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21%

36%

78%

89%

Aqua Regia has ratio of conc. HCl and HNO₃

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1 : 2

1 : 3

1 : 4

2 : 3

The brown gas formed when metal reduces HNO₃is

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N₂O₅

N₂O₃

NO₂

NO

NO₂ forms acidic solution

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Red

Blue

Green

Brown

The most stable phosphorus allotrope is

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White

Red

Black

All

Which catalyst is used in contact process?

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Fe₂O₃

V₂O₅

SO₃

Ag₂O

Colour of N₂O₄ is

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Raddish brown

Yellow

Colouries

green

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