Question # 1

Which is nitrous acid?

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HNO₃

HNO

HNO₂

H₂NO₃

Which catalyst is used in contact process?

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Fe₂O₃

V₂O₅

SO₃

Ag₂O

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

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O₂

O₂⁺

O₂^-

O₂^-2

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

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Sb

N

P

As

Out of all the elements of group V1-A the highest melting and boiling points is shown by the element

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Te

Se

S

Pb

Ring testis given by ions.

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Nitrides

Nitrates

Cyanates

Nitriles

Reaction of HNO, with very dilute Zinc and at low temperature gives

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H₂

NO

NO₂

NH₄

Colour of PCl₅is:

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Red

Yellowish White

Grey

Colourless

The most stable phosphorus allotrope is

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White

Red

Black

All

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

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N

P

Sb

Bi

Which are metalloid?

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Nitrogen and phosphorous

Arsenic and phosphorous antimony

Phosphorous and arsenic

Antimony and bismuth

NO₂ forms acidic solution

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Red

Blue

Green

Brown

Which property is not present in non-methals

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Predominantly covalent

Poor conductor

Hig E.N. value

High electropositivity

Bone ash contains calcium phosphate

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70%

80%

90%

100%

Allotropic forms of phosphorus are

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three

four

five

six

Allotropic forms of sulpher are

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Two

Three

Four

Five

Which is an inert gas?

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Nitrogen

Oxygen

Hydrogen

CO

Group VI-A elements are called:

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Halogens

Electron deficient

alkaline earth metal

Chalcogens

Which is laughing gas?

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NO

N₂O

NO₂

NO₃

Which gas is heavier than air?

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CO₂

NH₃

Cl₂

CO₂

Which has garlic like odour?

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N₂O

NO

NO₂

NH₄

Formation of NO from N₂ and O₂ requires temp

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30⁰C

300⁰C

3000⁰C

30000⁰C

Calcium carbonate contains oxygen in it

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48%

50%

53%

60%

Nitrogen is present in atmosphere by weight

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75%

76%

77%

78%

Tungsten and Uranium are turned to an reaction with HNO₃:

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Oxides

chlorides

Nitrides

Nitrates

Which element belongs to group V-A?

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Cs

Ba

Sr

Bi

Aqua Regia has ratio of conc. HCl and HNO₃

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1 : 2

1 : 3

1 : 4

2 : 3

Which phosphorus is the most poisonous?

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White

Red

Black

All

All elements of group VI-A non-metal except

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Te

S

Se

Po

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