Question # 1

The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of

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Carbocation

Carbanion

Pentavalent carbon in the transition state

Free radical

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb

Relationship between volume of a gas and prevailing conditions of temperature and pressure are called

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Gas laws

Equilibrium laws

Rate laws

None of these

Which of the following is addition polymerization

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PVA

Polystyrene

Both

None

The factor responsible for lower mercury level in a capillary tube is

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High density

Surface tension

Liquid state

Metallic Colour

S.I units for measurements of pressure

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Pascal

mm of Hg

atm

Torr

Cellulose does:

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Satisfy human appetite

Stimulates intestinal peristalsis

Fives fibre and bulk to the food

All of these

It is very much difficult to cook food at Mount Everest, because

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temperature of atmosphere is very low

the boiling point of water is 69°C

water becomes heavier

the boiling point of water is increased

Photo chemical smog contains ______ as main reactants

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Nitrons oxide and unburnt hydrocarbons

Nilric oxide and unburnt hydrocarbons

No and burnt hydrocarbons

N₂O and burnt hydrocarbons

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Among solids,the highet melting point is exhibited by

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Covalent solids

Ionic solids

Pseudo solids

Molecular solids

When aqueous NaCl is electrolyzed, which of the following ions get discharged at anode :

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H⁺

Na⁺

OH^-

Cl^-

Alcohol reacts with halogen acid to produce

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Alkyl halides

Aldelydes

Ketones

Alkanes

Factors affecting denaturation of proteins:

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Change in temp and pH

Strong reducing agent

Strong oxidizing agent

All of these

Which of the following is the hardest metal among following

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Li

Na

Rb

K

Benzene is an example of

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Aromatic compound

Cyclic compound

Aliphatic compound

A cyclic compound

strength of an acid can be determined by

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P^ka

P^kp

P^oH

P^kw

What is formed when oxalic acid is dehydrated by conc. H₂SO₄?

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C + CO₂

CO

CO₂

CO + CO₂

Photochemical smog is caused by

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CO

CO₂

O₃

NO₂

In fructose the possible optical isomers are

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12

8

16

4

The largest item which is recycled is

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Newspaper

Plastic

Aluminium

Oil

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

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