Question # 1

The bonding occurs among polar covalent molecules containing H and one of the small electronegative element such as O,F or N is called:

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Ionic bonding

Metallic bonding

Bridge bonding

H-bonding

The red brown ppt. of Fehling solution and benedict solution tests are of

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Ag

Cu2O

CuO

AgBr

Fumaric acid converted into malic acid in the presence of

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Lyases

Glyceomutases

Fumarase

Hydrolases

Polymerisation of vinyl acetate is a type of:

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homopolymer

copolymer

ter polymer

All of these

In order to maintain the boiling point of water at 110 C°, the extemal pressure should be

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550 torr

between 500 and 760 tor

between 760 and 1500 torr

any pressure can be maintained

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

Properties of polymeric material depends upon

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Chemical composition

Structure of molecule

Boiling point

Both A and B

Monosaccharides adn oligosacchardies are generally called as

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Crystal

Sugars

liquids

Non-sugars

Which one among the following is not a natural polymer?

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protein

cellulose

nylon

nucleic acid

Plastics are amorphous solids and

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have sharp melting points

undergo clean cleavage when cut with knife

do not undergo clean cleavage

possess orderly arrangement over long distances

Enthalpy of a system can be calculated by which of following relationship

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q=ΔΕ

q=m×S×∆T

q=pv

q=m×v×∆T

Solubility of KMnO₄at higher temperature is:

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5%

7%

15%

25%

Ifk_cof a reaction productis verylarge, it indicates that equilibrium occurs :

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With the help of a catalyst.

With no forward reaction.

At a low product concentration.

At a high product concentration.

Which of the following has highest oxidation potential

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Be

Li

Na

Ca

The word paper is derived from the name of which reedy plany

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Rose

Sun flower

Papyrus

Water hyacinth

The chemical reactivity of glass is reduced by the use of

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Fluxes

Formers

Stabilizers

None of these

Which of the following synthetic fertilizer do not make soil acidic

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Urea

Thin urea

Ammonium phosphate

Potassium nitrate

Which has soapy touch?

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Na2B4O7

H3BO3

Ca2B6O11

HBO2

Which statement is correct for the fuel cells

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These cells operate at low temperature

No catalyst used for the formation of water

MnO₂is used as electrolyte

The presence of a double bond in a compound in the sign of:

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Saturation

Unsaturation

Subsitution

None

When copper is allowed to react with HNO₃, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is

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Cu(NO₃)₂

CuO

O₂

HNO₂

Molecules of High molecular weight usually greater than 10,000 are called:

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Macro molecules

Mega molecules

Poly molecules

Gega molecules

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