Question # 1

Which is not an enzyme

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Transverses

Lipase

Lyase

None of these

When vapour pressure is equal to atmospheric pressure than it is called

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Evaporation

M.P

B.P

Freezing point

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

Surface and ground water sources are contaminated by various human activities which of the followings is not a human activity that causes contamination in fresh water

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live stock waste

oil leaks and spills

disposal of industrial effluents

rain

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Ozone is produced in regions:

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tropical

Polor

antaric

equator

Which of the following factors is not used to determine the quality of water

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COD

BOD

DO

Available chlorine

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

Lipids are naturally occurring compounds produced in cell and are water insoluble but soluble in organic solvents. One of the followings is not a lipid. Select among the following

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Nucleic acid

A triglyceride

Sterol

Vitamin D

Forms of waste products:

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Heat

Smoke

Solid

All of these

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

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Paschen

Pfund

Balmer

Brackett

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

The major components of coal gas are

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Hydrogen and methane

Ethane and carbon monoxide

Nitrogen and ethane

Ethane and carbon dioxide

A suitable solvent should dissolve maximum amount of solute at its boiling point and minimum amount at :

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Freezing point.

Room temperature.

Boiling point.

Sea level temperature.

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

In Lucas test primary alcohol make as oily layer

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Immediately

In 10 mins

On heating

Not

In the rate equation when the concentration of reactants are unity, then rate is equal to

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Instantaneous rate

Average rate

Active mass of products

Specific rate constant

Where energy is released during a reaction it is

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Exothermic reaction

Endothermic reaction

A free radical reaction

A bond breaking reaction

The OH group present in acids may be replaced by CI atom on treatment with

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PCI₅

SOCI₂

Both of them

None of the above

Best medhod of preparation of alkyl halide from alcohals is by its reaction with:

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HX

SOCl₂

Px₅ and PX₃

All

Ethylene reacts will 1% cold alkaline KMnO₄to give

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Oxalic acid

Acetone

Ethylene glycol

Formaldehyde

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