Question # 1

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

NH₃shows maximum boiling among the hydrides of group V elements. The is due to:

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pyramidal structure of NH₃

H-bonding between its molecules

enhanced electronegative character

very small size of nitrogen

According to kinetic theory of gases there are

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Intermolecular attractions

Molecules which have considerable volume

No intermolecular forces of attraction

The velocity of molecules decreases for each collision.

During combustion analysis, which one is used for absorbing carbon dioxide:

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50% KOH

5% KOH

Mg(ClO4)2

Silica gel

If the number of gas molecules are doubled in the certain volume the pressure is:

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Increased to four times

Remains unchanged

Doubeld

Decrease to half

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimer

Macromer

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

Aldehydes are easily oxidized to corresponding carboxylic acids in the presence of:

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Strong oxidizing agents

Highly strong oxidizing agents

Tollen's reagent

Tollen's reagent and Fehling solution

Which of these polymers is an addition polymer?

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nylon 6,6

polystyrene

terylene

epoxy resin

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called

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Ionization energy

Potential energy

Electron affinity

Bond energy

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

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4-Bromobenzyl cyanide

4-Cyanobenzyl chloride

4-Cyanobenzyle cyanide

4-Bromo 2-cyanobenzyl chloride

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

Reaction of Grignard's reagent with ketones gives: Reaction of Grignard's reagent with formaldehyde gives:

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Pri-alcohol

Sec-Alcohol

Ter-alcohol

Carboxylic

Which of the sub-atomic particles is not charged

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Electron

Proton

Neutron

All of them

The digestion of fats in the intestines is aided by

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Diffusion

Protection

Peptization

Emulsification

The monomeric units of starch is/are

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Glucose

Fructose

Glucose and fructose

Mannose

A solution sucrose is 34.2%. The volume of solution containing one mole of solute :

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342cm³

1000cm³

500cm³

242cm³

Which is independent of temperature

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Molarity

Molality

Normality

Mole fraction

When 3p orbital is complete, the entering electron goes into

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4s

3d

4p

4f

The substances that are added to the soil to provide nutrient or assential elements required for plant growth, are called

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Additives

Fertilizer

Manures

Posticides

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