Question # 1

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

The decrease in electron density at one position accompanied by a corresponding increase at other position is called.

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Inductive effect

Asymmetric effect

Electromeric effect

Resonance effect

Ziegler -Natta catalysta is

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(C2H3)3 Al

TiCl4

(C2H5)3 Al/TiCl4

(C2H3)3 B/TiCl2

An example of nitro dyes is.

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Martius yellow

Auramine O

Malachite green

Methyl red

Which of the following compounds would you use in order to obtain a crystalline derivative of an aromatic amine.

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2,4 Dinitrophenyl hydrazine

Nitrous acid

Benzoyl chlride

None of these

Which of the following statements regarding phenols is not correct.

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Phenol ls are stronger acids than water and alcohols.

Phenol are weaker acids than carboxylic acids

Phenol are solubel in both aqueous NaOH and aqueous sodium hydrogen carbonate

Phenoxides ions are more stable than the corresponding phenol

The condensation between formaldehyde and acetaldehyde in the presence of conc. NaOH and heat gives.

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Acrolein

Mixture of CH3OH and CH3COO Na.

Mixture of CH3CH2OH and HCOO - Na+

None of these

Hydrogen bons holding the strand to nucleic acids are formed between

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Sugar and base units

Base unit

Sugar ane phosphate units

Sugar units

Which of of the following statement is not correct in respect of

Arrhenius concept.

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This concept is applicable only for aqueous systems.

Neutralization takes place in aqueous medium only

H+ ion concept remain as such in water

This concept is applicable for non aqueous system only.

Apoenzyme is

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Hydrolytic enzyme

Oxidative enzyme

Coenzyme

Protein part of enzyme after removal of coenzyme

Given A + 3B ____________ 2C + D

This reaction is first under with respect to reactant A and second order with respect to reactant B . If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would _____ by factor of _____________

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Increase ,2

Decrease ,2

Increase ,4

Decrease ,4

In order to give strength and elasticity natural rubber is heated with.

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Sulphur

Oxygen

Nitrogen

Chlorine

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

Select an acidic amino acid

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Lysine

Cystine

Aspartic acid

Aminoacetic acid

Enzymatic action is heat at a fixed

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Temparature

pH

Both of these

None of these

Aromatic amine (X) was treated with alcoholic potash and another compound (Y) when foul smelling gas was formed with formula C2H3N (Y) was formed by reacting a compound (Z) with Cl2 in the presence of slaked lime . The compound (Z) is

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C6H5NC

CHCl3

CH3CH2OH

C6H5NH2

Essential oils are purified by which of the following methods.

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Steam distillation

Sublimation

Crystallization

Fractional crystallization

Which of the following contains isoprene unite.

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Natural rubber

Nylong -6,6

Polyethylene

Decron

Putrefaction is

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Hydrolysis of proteins

Reduction of proteins

Bacterial oxidation of proteins

All of these

Glycine reacts with nitrous acid to form

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Methyl amino

Acetic acid

Zwitter ion

Glycollic acid

Suppose the activatin energy of a certain reaction is 250 kj/mol, If the rate constant at T1 =300 K is k1 and the rate constant at T2= 320 K is ks, then the reaction is ______ times faster at 320 K than at 300 K

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3 x 10^-29

0.067

525

15.0

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