Question # 1

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

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0.01 mole

0.064 mole

0.044 mole

0.054 mole

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy?

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50000

20000

100000

10000

The % age of nitrogen in ammonia is:

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80%

92%

90%

50%

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1

An example of simple protein is

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lipoprotein

Cholesterol

lecithin

globulin

Which of the following has no hydrogen-bonding

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Diethyl ether

Water

Ethyl alcohol

Phenol

Newspapers can be recycled again and again by how many times

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5

2

4

3

The polymers which can be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

Which is used as a coagulant:

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Ferric salts

Potash alum

a and b both

Chlorine

The fibre which is made form acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

The cathodic reaction in the electrolysis of dill H₂SO₄with Pt electrodes

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Reduction

Oxidation

Both oxidation and reduction

neither oxidation or reduction

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

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Electric field

Magnetic field

Incident light

X-rays

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

Platinum is poisoned by

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Arsenic

Silver

Argon

Zinc

Which of the following elements have the largest radius

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F

Cl

Br

l

Grignard's reagent on treatment with dry CO₂and HCI yields

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Ester

Alcohol

Carboxylic acid

Aldehyde

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as

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Wurtz reaction

Cannizzaro reaction

Friedel Craft reaction

Claisen reaction

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Homogeneous

Heterogeneous

Isogeneous

None

Which on of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

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