Question # 1

Ecosytem is a smaller unity of:

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nydosphere

biosphere

lithosphere

atmosphere

Hexamethylene reacts with _______ to prepare nylon 6,6

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acetic acid

adipic acid

formic acid

none of above

The scale of temperature that shows the freezing point of water at 0° is called

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Fahrenheit

Kelvin

absolute

Celsius

The density of ice is 1.00gcm^-3.

What the volume of steam produced when 1.00-3 of ice is heated to 323^{∘C (596K) at a pressure of one atmosphere (101kPa)?}

[1 mol a gas occupies 24.0dm³ at 25a^∘C(295K)and one atmosphere.]

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0.267 dm³

1.33 dm³

2.67 dm³

48.0 dm³

Which of the following gas cannot be liquefied by Linde s method

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H₂O vapours

N₂

H₂

CO₂

Proxy acetyl nitrat5e (PAN) is an irritant to human beings and it affects:

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nose

stomach

eyes

ears

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

Potency and turn over are terms related to:

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enzymes

proteins

fats

oils

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

Absolute temperature is the temperature at which

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All molecular motion ceases

volume becomes zero

Mass becomes zero

None of these

Which of the following liquid has high vapour pressure?

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H₂O

ether

CH₃OH

C₂H₅OH

Which one of the following statements is true about discovery of neutrons?

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These particles were formed by the bombardment of Alpha-particles on Beryllium.

These particles are formed by the spiting of alpha-particles.

These particles were discovered by natural radioactivity.

None of above.

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

Hybridization in alkanes is:

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sp

sp²

sp³

dsp²

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

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Electroplating

Electrolysis

Conduction

Induction

Which of the following compound is obtained on passing ethanol vapours on heated Al₂O₃?

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Ethylether

Acetone

Ethane

Ethanol

Glacial acetic acid freezes to ice like solid it.

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07

17

27

37

Tryosine was isolated from

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Butter

Cheese

Oils

Fats

Benzene reacts with ozone and gives

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Glycerin

Glyoxal

Maleic anhydride

Benzoic acid

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

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Wurtz reaction

Fitting reaction

Wurtz fitting reaction

None of these

Which statement is correct for the fuel cells

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These cells operate at low temperature

No catalyst used for the formation of water

MnO₂is used as electrolyte

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