Question # 1

The ratio of diffusion of equal volume of He and SO₂is (molecular mass He = 4, SO₂= 64):

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1:4

16:1

1:16

4:1

Amino acid which synthesized many hormones is

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Valine

Phenylalanine

Alanine

Histidine

One of the following is not a biopolymer,Point out that one:

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lipid

starch

diamond

protein

London dispersion forces are the only force present among the:

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molecules of water in liquid state

atoms of helium in gaseous state at high temperature

molecules of solid iodine

molecules of hydrogen chloride gas

Polysaccharides are also called

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Crystals

Sugars

Liquids

Non Sugars

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

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2: 1

1: 2

3: 1

4: 1

Which of the following least resembles an ideal gas?

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ammonia

helium

hydrogen

trichloromethane

D-block elements are also called

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Non-typical transition element

Outer transition elements

Abnormal transition elements

Inner transition

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

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constant P and T

constant P and V

constant T and V

constant n and v

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

Dehydrogenase is an example of

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ligase

oxidoreductase

lyase

hydrolase

The percentage of which element in the organic compound is determined by the difference method

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Carbon

Hydrogen

Nitrogen

Oxygen

acetylene can be converted into-while passing through a Cu-tube at 300°C:

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Glyoxal

Vinyl acetylene

Vinyl alcohol

Benzene

Which of the following reactions occur at moderate rate :

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Rusting of iron

Chemical weathering of stone work of buildings by acidic gases in atmosphere.

Hydrolysis of an ester

Fermentation of sugars

A standard hydrogen electrode (S.H.E) consists of a platinized platinum electrode dipped in 1 molar solution of H⁺ions and hydrogen gas is passed at a pressure of

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One pascal

One kilo pascal

One atmoshpere

Then atmoshpere

The percentage of nitrogen in ammonium nitrate is

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32 - 33.5%

34 - 36%

40 - 45%

None of these

The amount of heat evolved or absorbed in a chemical reaction indicated by balanced chemical equation at 25° and one atmospheric pressure is called

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Enthalpy of formation

Enthalpy of neutralization

Enthaply of combustion

Enthaply of reaction

Classical smog occurs in palces of

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Excess SO₂

Low temperature

High temperature

Excess NH₃

Tryosine was isolated from

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Butter

Cheese

Oils

Fats

Which is used for the reduction of aldehydes and ketones

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NaBH₄

Pt/Pd

Ni

All of these

Wohler synthesized first of all the organic compound:

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Carbohydrates

Urea

Aniline

Toluene

On heating acetaldehyde with ammonical silver nitrate solution, we get

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CH₃OH

Silver acetate

HCHO

Silver mirror

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