Question # 1

A teacher told his student that air is a mixture. This is due to the reason that suddenly a student raised his hand and said:

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it has different properties from its constituents

oxygen can be removed from it

it is colourless

its composition is different at different altitudes.

As gases can adopt the shape of the container. Therefore gases have:

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different shapes

fixed shapes

no fixed shapes

definite shapes

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

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Thermoplastic

Thermosetting

Both a and b

None

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

In water the most important oxidizing agent is dissolved molecular oxygen which ranges form

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

Example of essential aromatic amino acids

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Theronine

Alanine

Phenyl alanine

Glycine

A complete food contains at least:

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three nutrients

ten nutrients

six nutrients

eight nutrients

CuSO₄5H₂O crystals belong to

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triclinic

cubic

tetragonal

orthorhombic

Acceptance of macromolecular hypothesis was due to efforts of:

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Kekule

Gibbs

Standiger

anderson

______ are called biocatalysts

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Organic acids

Organic bases

Enzymes

All

Setting time of cement is controlled by adding:

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Epsom

Gypsom

CaCO₃

CaCl₂

The amount of heat evolved or absorbed in a chemical reaction indicated by balanced chemical equation at 25° and one atmospheric pressure is called

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Enthalpy of formation

Enthalpy of neutralization

Enthaply of combustion

Enthaply of reaction

The stroids of fungi and yeast and yeast are called:

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Vitamin D

Vitamin D₂

Ergostrol

Cholestrol

Which of the following has ester linkage?

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Nylon

Bakelite

Terylene

PVC

Identify the hydrocarbon formed, when ethyl bromide reacts with, alcoholic KOH at 100°

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Methane

Ethane

Ethene

Ethyne

Borax is hydrated:

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Penta

Deca

Hepta

Octa

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

In the ground state, an element has 13 electrons in its M shell. The element is

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Copper

Chromium

Nickel

Iron

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

The example of colligative property is

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Boiling point

Osmosis

Freezing point

Osmotic pressure

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