Question # 1

NO₂forms acidic solution:

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Red

Blue

Green

Brown

Oxidation of NO in air produces

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N₂O

N₂O₃

N₂O₄

N₂O₅

All elements of group VI-A non-metal except

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Te

S

Se

Po

Calcium carbonate contains oxygen in it

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48%

50%

53%

60%

Which is the most reactive?

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White phosphorus

Red Phosphorus

Graphite

Plastic sulphur

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

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Sb

N

P

As

NO₂ forms acidic solution

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Red

Blue

Green

Brown

Which is nitrous acid?

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HNO₃

HNO

HNO₂

H₂NO₃

Which gas is heavier than air?

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CO₂

NH₃

Cl₂

CO₂

Colour of N₂O₄ is

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Raddish brown

Yellow

Colouries

green

Allotropic forms of sulpher are

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Two

Three

Four

Five

Nitrogen is present in atmosphere by weight:

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75%

76%

77%

78%

Nitrogen is present in atmosphere by weight

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75%

76%

77%

78%

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

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.

Nitrogen is present in atmosphere

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21%

36%

78%

89%

Formation of NO from N₂ and O₂ requires temp

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30⁰C

300⁰C

3000⁰C

30000⁰C

Which are metalloid?

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Nitrogen and phosphorous

Arsenic and phosphorous antimony

Phosphorous and arsenic

Antimony and bismuth

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

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H₂

NO

NO₂

NH₄

Specific gravity of HNO₃ is

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1.35

1.53

1.39

1.93

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

Which element belongs to group V-A?

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Cs

Ba

Sr

Bi

Posphorus belongs to a group

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III-A

IV-A

V-A

VI-A

Tungsten and Uranium are turned to an reaction with HNO₃:

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Oxides

chlorides

Nitrides

Nitrates

Calcium carbonates contains oxygen in it:

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48%

50%

53%

60%

Ring testis given by ions.

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Nitrides

Nitrates

Cyanates

Nitriles

Nitrogen is present in atmosphere

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21%

36%

78%

89%

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

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