Question # 1

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

Which of the following polymers is used for weather resistant paints

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acrylic resins

polyvinyl acetate

polystyrene

PVC

2-propanol on oxidation yield

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Propionaldehyde

Propanone

Propanal

Butanal

Which of the following may be called London dispersion forces

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dipole-dipole forces

ion-dipole forces

dipole-induced dipole forces

instantaneous dipole-induced dipole forces

Daily protein intake for normal adults should be:

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0.2g/kg

0.5g/kg

0.8g/kg

1.1g/kg

The highest temperature at which gas can be liquefied and above which liquefaction is impossible is called

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Boiling temperature

Upper consulate temperature

Transition temperature

Critical temperature

Among solids,the highet melting point is exhibited by

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Covalent solids

Ionic solids

Pseudo solids

Molecular solids

When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl

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Increases

May increase or decrease

Decreases

None of these

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

In Case of elements the polymorphism is called

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Isotopic form

Allotropy

Isomorphism

Crystalline forms

The pH range of the acid rain is

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8 - 7

7 - 6.5

6.5 - 6

Less than 5

The fibre which is made from acrylonitrile as monomer:

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Activation energy is the difference of energy between the energy of the reactant and

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The product

The activated complex

Both a and b

None of these

For what value ofK_{c almost forward reaction is complete :}

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K_{c =}10³⁰

K_{c =}10^-30

K_{c =}0

K_{c =}1

The order of reactivity of halogen acids towards alkenes

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HCl > HBr > Hl

HBr > HCl > HI

HCl > HBr

HI > HBr > HCl

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

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When CO₂is made to react with ethyl megnesium iodine, followed by hydrolysis, the product formed is:

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Propane

Propanoic acid

Propanal

Propanol

Carbolic acid is the other name for

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Methanol

Ethanol

Propanol

Phenol

Most hazardous metal pollutant of automobile exhaust is

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Mercury

Lead

Cadmium

Copper

Pollution is

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Removal of top soill

Release of toxic/undesirable materials in enevironment

Conversation of energy

All the above

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