Question # 1

consider the physical properties of the gases. Which of the following statements about particles of gases is incorrect? The particles are:

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causing pressure

having wide spaces

orderly arranged

randomly moving

The branch of chemistry interlinked with biology, physics, medicines, agriculture, public health and sanitary engineering etc. is:

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Biochemistry

Physical chemistry

Pharmaceutical chemistry

Environmental chemistry

Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields

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Ketone

Carboxylic

Alkyl halide

Ester

Which substances do nto react immediately with bromine water:

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ethane

benzene

ethene

phenol

On ascending the electrochemical series strength as reducing agent

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Increases

Decreases

Remains same

not determinable

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

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rose

sun flower

papyrus

water hyacinth

Nucleic acid contain elements like N,H,O,C and

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Ca

S

P

F

Which of the following does not give yellow precipitate with I2+ NaOH

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Acetone

Benzaldehyde

Acetildehyde

Acetophenone

At same temperature which substance has high kinetic energy:

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Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

Which is the optimum temperature for the activity of enzyme?

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20 - 35°C

10 -15°C

55 - 70°C

35 - 55°C

Monosaccharides adn oligosacchardies are generally called as

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Crystal

Sugars

liquids

Non-sugars

Which of the following metal requires radiation of highest frequency to cause emission of electrons?

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Na

Mg

K

Ca

Most common reactions of benzene and its derivatives are

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electrophilic addition reactions

electrophilic substitution reactions

Nucleophilic addition reactions

Nucleophilic subtitution reactions

Which of the following elements should be the least metallic in character

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Rb

ln

Te

l

Reaction takes place at anode is

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Ionization

Reduction

Oxidation

Hydrolysis

Pro stand for

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Valine

Alamine

Glycine

Proline

Caroxyl group has functional in it.

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one

two

three

four

Among O, C, F, Cl, Br, the correct order of increasing radii is

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F O C Cl Br

F C O Cl Br

F Cl Br O C

C O F Cl Br

The catalytic prmoter used for the industrial preparation of acetaldehyde is

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PdCI₂

CuCI₂

Pd + CaCI₂

None of these

The colour of a transition metal complex is due to d-d transition The colour of the complex is the complementary of the colour absorbed. Thus [Ti(H₂O₆]³⁺abosrbs yellow light and transmits blue and red colours therefore the solution of titanium complex appears

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Blue

Red

Yellow

Mixture of blue and red or violet

I a chemical reaction equilibrium is said to have been established when :

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Rate of opposing reactions are equal.

Rate constants of opposing reactions are equal.

Opposing reactions stop.

Concentration of reactants and products are equal

Self condensation of acetaldehyde in the presence of dilute alkalies gives

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An acetal

An aldol

Mesitylene

Propionaldehyde

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