Question # 1

Substances that tend to decrease the activity of enzymes are called

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coenzyme

activators

inhibitors

apoenzyme

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Which of the following liquids have low vapour pressure at 25°C

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Water

Ethyl alcohol

Acetone

Diethyl ether

Which alcohol is most reactive towards sodium metal?

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Ter Butyl alcohol

n-Propyl alcolol

Isopropyl alcohol

Have same reactivity

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

When stress is applied to the metals, the metals are malleable and ductile because

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their layers slip pass each other

atoms lose electrons

mobility of electrons increased

none of the above

Sex harmones belong to a group of organic compounds called:

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heterocyclics

steroids

amino acids

amines

Enzymes consist of

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proteins only

proteins and non-protein parts

fats only

futs and non-fatty components

In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains

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Double

Same

Half

Four times

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Optimum temperature for enzyme activity is

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125°C

37°C

40°C

100°C

Alkyl halides on treatment with aqueous KOH give

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Phenol

Alcohol

Aldehyde

Ketone

Which reagent will distinguish a ketone from an aldehyde

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Br₂

2, 4-dinitrophenylhydrazine

NaBH₄

Tollen's reagent

Which of the following does not turn Schiff's reagent to pink?

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Formaldehyde

Bezaldehyde

Aceton

Methyl chloride

Anode is the surface on which probability of finding electron is:

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50%

Less than 10%.

More than 95%.

Zero.

Boiling point of acetic acid is°C:

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116

117

118

119

Ionization energy depends upon

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Nuclear charge

Atomic size

Shielding effect

All of the above

Which is not carboxylic acid with pungent smell?

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Formic acid

Acetic acid

Ethanoic acid

Butyric acid

Selection of filter paper depends upon sizes of particles to be :

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Tested.

Filtered.

Checked.

All of above.

The rate of which the reaction proceeds is directly proportional to the product of the active masses of the reactants is according to

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Law of mass action

Le Chateliers principle

Equilibrium law

Law of constant proportion

Which of the following is not a property of cathode rays

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They can produce x-rays when they strike a heavy metal anode

They can cause reduction reaction

They produce fluorescence in rare earth and minerals

They comprise neutral particles

Depletion of ozone is more during the month:

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Jan - March

April - Ju8n

July - Aug

Sept - Nov

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