Question # 1

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

Laughing gas is chemically

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NO

N_2O

NO₂

N₂O₄

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%

Bone ash contains calcium phosphate

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70%

80%

90%

100%

Allotropic forms of sulpher are

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Two

Three

Four

Five

Calcium carbonates contains oxygen in it:

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48%

50%

53%

60%

Aqua Regia has ration of conc. HCl and HNO₃.

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1 : 2

1 : 3

1 : 4

2 : 3

Colour of N₂O₄ is

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Raddish brown

Yellow

Colouries

green

NO₂ forms acidic solution

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Red

Blue

Green

Brown

Formation of NO from N₂ and O₂ requires temp

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30⁰C

300⁰C

3000⁰C

30000⁰C

Which is nitrous acid?

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HNO₃

HNO

HNO₂

H₂NO₃

Which is laughing gas?

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NO

N₂O

NO₂

NO₃

Which are metalloid?

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Nitrogen and phosphorous

Arsenic and phosphorous antimony

Phosphorous and arsenic

Antimony and bismuth

Which property is not present in non-methals

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Predominantly covalent

Poor conductor

Hig E.N. value

High electropositivity

The brown gas formed when metal reduces HNO₃is

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N₂O₅

N₂O₃

NO₂

NO

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

Allotropic forms of oxygen Te, Se are

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Two

Three

Four

Five

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

Which is aqua regia?

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HCL : NO

HCl : HNO₃

HCl : H₂SO₄

H₂SO₄: HNO₃

What are non-metals?

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Sb & Bi

P & Bi

N & P

As & N

Aqua Regia has ratio of conc. HCl and HNO₃

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1 : 2

1 : 3

1 : 4

2 : 3

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 element of group IV-A does not use d-orbital?

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N

P

As

Sb

Specific gravity of HNO₃ is

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1.35

1.53

1.39

1.93

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.

Oxidation of NO in air produces

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N₂O

N₂O₃

N₂O₄

N₂O₅

Which gas is heavier than air?

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CO₂

NH₃

Cl₂

CO₂

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