Question # 1

Which element exists as discrete small molecules in the solids state

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Aluminum

Silicon

Iodine

Sodium

Lattice energy is also termed as

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ionization

crystal energy

dissociation

bond energy

Which one of the following does not show isomerism?

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Propane

Hexane

Butane

Pentane

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

Which one of the following is not true relationship

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A term to express the partial pressure of water vapours in a gas is known as

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vapour pressure

aqueous tension

partial pressure

moisture

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is

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1

2

3

4

Steroids belong to the family of

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Protein

Enzyme

Lipids

Carbohydrates

The % age of nitrogen in ammonia is:

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80%

92%

90%

50%

During sudden expansion of a gas energy is needed to overcome the intermolecular:

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Vibrations

Attractions

Repulsions

All of above

For formation of ionic bond, electronegativity difference should be

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Equal to zero

Equal to 0.5

More then 1.7

Less than 1.7

Ammonium nitrate fertilizers is not used for which crop?

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Cotton

Wheat

Sugar-cane

Paddy rice

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C?

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Nitric oxide

Nitrous oxide

Nitrogen dioxide

Dinitrogen tetraoxide

Which is the formula of tetra-ammine chloro-nitro platinum (IV) sulphate

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[Pt(NH₃)₄(NO₂)] SO₄

[Pt NO₂CI(NH₃)₄] SO₄

[Pt CI(NO₂) (NH₃)₄] SO₄

[Pt (NH₃)₄(NO₂) CI] SO₄

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

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Colouration test

Baeyer's test

Silver mirror test

Ring test

Which is not the affect of polluted air on environment

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Acid rain

Smog

Ozone

Global warming

Ammonium carbonate when heated to 200°C gives a mixture of NH₃and CO₂vapour with a density of 13.0. What is the degree of dissociation of ammonia carbonate?

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3/2

1/2

2

1

Which has soapy touch?

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Na2B4O7

H3BO3

Ca2B6O11

HBO2

Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

An azeotropic mixture of two liquids boils at a lower temperature than either of them when lower temperature

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It is saturated

it shows positive deviation from Raoult's law

It shows negative deviation form Raoult's law

It is metastable

Which of the following groups will increase the acidity of phenol?

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-NO₂

-CN

-X (halogens)

All

Group l-A elements react with water fastly than the reaction of group ll-A elements because

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

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