Question # 1

The lanthanides contraction is responsible for the fact that

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Zr and Y have about the same radius

Zr and Nb have similar oxidsation state

Zr and Hf have about the same radius

Zr and Zn have the same oxidation satete

One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

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Two

Three

Four

None

Every sample of matter with uniform properties and a fixed composition is called a :

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Solid

Liquid.

Phase.

Gas.

Which one of the following is not a nucleophile

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H₂O

H₂S

BF₃

NH₃

Hydroxyl amine is a derivative of::

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Alcohol

Aldehyde

Ammonia

Ketone

Specific conductivity of a solution

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Increases with dilution

Decreases with dilution

Remains unchanged with dilution

Depends on mass of electrolyte

Hemoglobin contains nearly:

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10,000 atoms

100 atoms

1000 atoms

1 atom

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

The vapour pressure of two liquids 'p' and 'Q' are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

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140 torr

20 torr

68 torr

72 torr

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

Photochemical smog is caused by

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CO

CO₂

O₃

NO₂

The filtration process is used to separate solid from:

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Liquid

Gas

Solid

All of above

In the modern long form of the periodic table elements are arranged in the increasing order of

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Atomic mass

Atomic number

Mass number

Isotopic number

Benzene hexachloride is used as

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Dye

Antimaterial drug

Antibiotic

Insecticide

In which type of following solutions the total volume of solutions may not be necessarily equal to sum of volumes of solute and solvent ?

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Percentage volume/volume

Percentage volume/weight

Percentage weight/volume

Percentage weight/weight

In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

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Also be doubled

Be halved

Becomes one fourth

Remains the same

The radiations with wavelength shorter than violet light are called

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Ultraviolet

Infrared

Microwave

Radio frequency

Oceans cove ______ percent of the surface of the earth

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60

70

80

97

What happens when isotonic solution of A (mol.wt.342) and B (mol.wt 60) are put in to communication through semipermeable membrane?

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Transference of solvent from solution A to that of B take place

Transference of solvent from solution B to that of A takes place

No transference of solvent from solution A to that of B takes place

Change in temperature of solutions takes place

Units of molarity are

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gm/lit

mol/lit

kg/lit

None of these

Soil salinity can be measured by

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Calorimeter

Potometer

Porometer

Conducitvity meter

If the salt bridge is not used between two half cells, then the voltage

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Decrease rapidly

Decrease slowly

Does not change

Drops to zero

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

The value of K_pis greater than K_cfor a gaseous reaction when

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Number of molecules of products is greater than the reactants

Number of molecules of reactants is greater than those of products

Number of molecules of reactants and products equal

Catalyst is added

Either, an organic compound has close resemblance in structure and thus a derivative of:

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Water

Oxides of lithium

Oxides of magnisium

Oxides of aluminium

How many zones through which the charge passes in a rotary kiln

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4

3

2

5

Oxidation reduction is done by

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Oxidoreductase

Lipases

Lyase

None of these

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

A food chemist wants to create the odour of pineapples for a product. An ester with this odour has the formula C₃H₇COOC₂H_5.Which pair of reagents would produce this ester

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C₂H₅CI and C₃H₇COOH

C₂H₅OH and C₃H₇CONH₂

C₂H₅OH and C₃H₇COOH

C₃H₇OH and C₂H₅COCI

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