Question # 1

In proteins, the alpha-helix and Beta-pleated sheet are examples of

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^{Primary Structure}

Secondary Structure

Tertiary Structure

Quaternary Structure

The spreading of ink on blotting paper is due to

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capillary action

hydrogen bonding

intermolecular forces of the ink

intermolecular forces of the ink and paper

Choose the crop for which ammonium nitrate is not used:

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paddy rise

cotton

wheat

sugar cane

Proteins have linkage between amino acids

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imide

amide

ester

ether

The fibre which is made from acrylonitrile as monomer:

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

The B.P. of compound is mostly raised by

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dipole-induced dipole interactions

london dispersion forces

intramolecular H-bonding

intermolecular H-bonding

At equilibrium, the concentration of reactants and products are

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Constant

Maximum

Different

Equal

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

A molecule of polysaccharide on hydrolysis produces _________ molecules of monosacharides:

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many

Few

2-10

100

The partial pressure of CH₄and O₂are 500 torr and 100 torr repectively in a 10 dm³vessel at 0°C. The ratio of number of molecules of CH₄: O₂is

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1: 2

5 : 1

5 : 2

2 : 1

Reason for the rancidity of fat is

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Low sponification

High reactivity of fat

Oxidation of fat

All

Corrosion of iron can be prevented by coating the surface with

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Zn

Sn

Ni

Any of the above

In which one of the following compound rings are not fused together at ortho positions

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Phenanthrene

Naphthalene

Diphenyemethane

Anthracene

The number of bonds in nitrogen molecule is

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Oneφ and one π

Oneφ and two π

three sigma only

Two φ and one π

The substance having highest conductivity at room temperature among the following is

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0.1 N HCl

0.1 N NaCl

Graphite

Glass

Simple sugars are :

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Monosacchrides

Disaccharides

Oligo saccharides

Trisaccharides

Simple sugars are :

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Monosaccharides

Disaccharides

Oligo saccharides

Trisaccharides

The formula of curprite is

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Cu₂S

Cus

Cu₂O

CuCO₃

The total number of rare earth elements is

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8

32

14

10

Which compound has the maximum repulsion with water?

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃----O---CH₃

The characteristic reactions of alkanes are

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Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

Mark the correct statement

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Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

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