Question # 1

Which of the following is a thermosetting plastic?

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PVC

polyethylene

polystyrene

melamines

Sponification is the hydrolysis of fast or fats or4 oils with an/a:

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acid

alkali

enzyme

metallic ion

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

Enzymes catalyse all biological reactions occuring in the cell. What is true about an enzyme?

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Enzyme is a small molecule

Enzyme is acidic in nature

Enzyme is a protein

Enzyme is a lipid

The most complex strueture a single polypetide can assume is

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1° structure

2°structure

3° structure

4° structure

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

The trade name of polytereafluoroethylene (PTFE) is

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Teflon

PVC

terelene

polyester

.Both aldehydes and ketones are planar to the neighborhoods of carbonyl (C-0) group. Which one of the following bonds is distorted towards the oxygen atoms?

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pi-bond of C and O

Sigma bond of C and O

Sigma bond of C and H

Sigma bond of C and C

Nitro alkanes exhibit the:

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Chain isomerism

Positional isomerism

Functional group

Metamerism

Correct order of intermolecular forces

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Gas < liquid < solid

Liquid < gas < solid

Gas < liquid < solid

Gas = liquid = solid

Which of the following equation is for idea gas:

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PV = dRT

PR = nTP

PM = nRT

PV = nRT

Hydrocarbons contain

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C and S only

C and H only

C, H, and O only

C, H, O and N only

The number of electron that are paired in oxygen molecule are

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16

12

14

7

The entropy of the universe

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Constant

Is equal to zero

Decreasing

Increasing

Rearrangement of an oxime to an amide in the presence of strong acid is called

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Curtius rearrangement

Fries rearrangement

Beckman rearrangement

Aldol condensation

Alkynes are colourless & odouless except

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Acetylene

Propyne

Butyne

Pentyne

Hydrocarbons are organic compounds which contain elements such as

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Hydrogen

Carbon

Hydrogen and carbon

Halogens

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8 g

16 g

32 g

24 g

Amino acids are buildng blocks of:

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protein

Carbohydrates

Lipids

fats

The total number of inner transition elements in the periodic table is

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10

14

28

30

During reaction of O₂and alkenes, a product:

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Glycol

Epxide

Halohydrin

Ethylene glycol

Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid?

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Amm. silver nitrate solution

Neutral ferric chloride

Sodium hydroxide solution

Sodium carbonate solution

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