Question # 1

Choose the chief air pollutant among the following which depletes ozone layer

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Carbon monoxide

Carbon dioxide

Chloroflurocarbons and nitrogen oxides

Sulphur dioxide

Reaction of alkyl halides with potassium cyanide in the presence of alcohols give:

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Carboxylic acids

Aldehydess

Alkyl nitriles

Acid amides

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

A molecule of polysacharide on hydrolysis produces __________of molecules of monosacharide,

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2 - 10

3

>10

2

The graph between pressure and volume at constant temperature for gas is:

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Isobaric

Isothermal

Isotherm

None of above

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

a and b only

At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in:

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pressure

No. of moles

Volume

All

Lactic acid is buffered by

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L. Carnosine

Glutathione

Casenogin

Dopa

For a gas the isotherm is the graph between

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V and T

T and P

n and T

P and V

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases

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NO₂

SO₂

Hg

Pb

The helical structure of protein is stabilized by

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Peptide bond

Covalent

Hydrogen bond

Glycoside bond

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

______ gives peroxide

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Li

Ba

Sr

Be

The Zwitter ion is also called

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International salt

Internal salt

No salt

None of these

Contamination of water of tanning industries is due to:

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Cr(III)

Cr(VI)

Mn(III)

Mn(VII)

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0.12

0.50

0.25

4.00

Formalin is an aqueous solution of

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Furfural

Fluorescein

Formaldehyde

Formic acid

The shape of gaseous SnCl₂is

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Tetrahedral

Linear

Angular

T-shaped

On heating glycerol with conc. Sulphuric acid a compound with unpleasant odour is obtained. The compound is

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Methyl alcohol

Formic acid

Prop-2-enal

Glycerol sulphate

DNA has deoxyribose, a base and the third component is

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Phosphoric acid

Ribose

Adenine

Thymine

Which of the following is a nucleophile

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OH

CH(CH₃)₃

CH₃⁺

CH₃CH₂CH₃

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

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