Question # 1

what is the exact value of angle in BF3

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90

104.51

119.5

120°

The molecular mass of a polymer is obtained by multiplying mass of the monomer unit with the degree of polymerization, The degree of polymerization of PVC is 1000.What is molecular mass?

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65000

63000

62000

60000

Amino acids react together to form the primary structure of proteins which is accompanied by

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addition of water

addition of ammonia

removal of ammonia

removal of water

Which of these polymers is a synthetic polymer?

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starch

animal fat

polyester in an addition polymer

cellulose

Which woody raw material is used for the manufacture of paper pulp?

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cotton

bugases

poplar

rice straw

Sponification is the hydrolysis of fats or oil with an/a:

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enzyme

me5tallic ion

acid

alkali

All amino acids are optically active except

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Amino acid

Series

Threonine

Tryltophan

Which of the following is not a category of proteins based upon their function?

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genetic

Regulatory

nucleo

structural

The unit of pressure ______ is commonly used by meteorologists

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mm of Hg

Kilopascal

Millibar

Pound per square inch

Type of bond between nitrogen and carbonyl group

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Hydrogne bonds

Covalent bond

Peptide bond

Disulphide bond

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

The reaction between fat and NaOH is called:

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Esterification

Hydrogenolysis

Fermentation

Sponification

When alkyl halides are heated with aqueous solution of ammonia at about 100°C, amines are formed. This reaction is known as

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Williamsons synthesis

GHoffmans reaction

Wurtz reaction

Clemensen reaction

Synthesis rubber is made by polymerization :

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Chloroform

Acetylene

Divinyl acetylene

Butene

Termochemistry is the study of chemical reaction accompanying

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Heat change

Rate change

Mass change

Volume change

Distillation of calcium salts of acetic acid and formic acids gives acetaldehyde. What compound would be obtained if only calcium salt of acetic acid is distilled

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Formaldehyde

Butyraldehyde

Propionaldehyde

Acetone

The sun of all the energies of atoms, molecule, ion, within system is called

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Enthalpy

K.E. of the system

Internal energy

None

Which technique is used to determine the absorption of radiations?

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Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

A species having positive or negative charge is called:

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Electron

Ion

Proton

Atom

If Grignard reagent is allowed to react with another alkyl halide the main product is

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An alkane

Cyclo alkane

Alkyne

An alkene

An electrolyte

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Forms complex ions solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

A standard hydrogen electrode (S.H.E) consists of a platinized platinum electrode dipped in 1 molar solution of H⁺ions and hydrogen gas is passed at a pressure of

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One pascal

One kilo pascal

One atmoshpere

Then atmoshpere

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