Question # 1

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy?

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50000

20000

100000

10000

Substances that render enzymes catalytically inactive are called

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coenzymes

substrates

inhibitors

apoezymes

Which one of the following statements about positive ions is incorrect?

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they are also known as cations

they are formed when electrons are removed from atoms

they are larger than the atom from which hay were formed

they are smaller than the atom from which they were formed

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

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-1 to 0

0 to +5

0 to-1

0 to +1

Meniscus is the shape of the surface of a liquid in a cylindrical container:

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meniscus may be convex

meniscus is concave

meniscus may be convex or concave depending upon the nature of metal

meniscus is plane

Globulin is

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A basic protein

A protein of low molecular weight

Heat coagulable protein

Easily soluble in water e.A fibrous protein

Carboxylic acids reacts with sodium carbonate, & gas evolved in this reaction

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CO2

H2

CO

Both a &b

Nucleic acid fist descovered in

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1868

1869

1900

1905

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimer

Macromer

At compromise distance the forces dominating between atoms are

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repulsive forces

attractive forces

Dipole induced dipole force

H-bonding

Neutrons was discovered by

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Mosely

Milliken

Chadwick

Ruherford

When 3p orbital is complete, the entering electron goes into

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4s

3d

4p

4f

The metal with highest electrical resistance at room temperature is

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Pb

Te

Po

Fe

The stroids of fungi and yeast and yeast are called:

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Vitamin D

Vitamin D₂

Ergostrol

Cholestrol

Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

Quaternary alkyl halides

A half reaction can be defines as :

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It always occurs at cathode.

Involves only half of a mole of electrolyte.

Occurs at one of the electrode.

Goes only half way to completion.

Vegetables oil are:

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Unsaturated fatty acids

Glycerides of saturated fatty acids

Essential oils obtained from plants

None of these

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RCH(CH₃)CO₂H + CH₃OH

RCH(CH₃)CO₂H + HCO₂H

RCH(CH₃)OH + CO₂

RCH(CH₃)OH + HCO₂H

Alkyl halides are reactive :

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High

Medium

Less

Least

The number of bonds in nitrogen molecule is

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Alkynes are colourless & odouless except

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Acetylene

Propyne

Butyne

Pentyne

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