Question # 1

Which of the following statement is not related with high quantum yield reasons.

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Formation of reactive intermediates which may act as catalyst

The active molecules may collide with other molecules and activates these molecules.

The reaction may be exothermic and heat evolve may activate other molecule

The primary photo chemical process may be reversed

Copper occurs in nature as.

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Native

Combined

Both native and combined

None of the above

Peeling of ozone umbrella is due to.

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CFCa

PAN

CO2

Coal burning

The common host compound for the formation of inclusion compound is.

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Urea

Thiourea

Cholic acid

All above

Which of the following is renewable resources of energy.

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Hydropower

Wind power

Solar power

All above

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

The size of quantum dot is ________________m

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5

5 x 10^-9

5 x10^-10

5 x10^-11

Linear molecules have ____________ axis of rotation

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C1

C2

C

C3

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware. etc. When mixed with cold con. H2SO4

The pH of the 0.0032 M H2SO4 is.

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3.2

4.0

2.198

1.0

The types of coordinate compounds.

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Labila

Inert

Both A and B

None of above

Pesticide residues appear in which of the following foods.

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Milk

Fruit

Fish

Vegetables

All above

In second group of inorganic qualitative analysis, the S^2-ions does not form precipitate with which of the following ions.

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^Hg2+

Cu²⁺

Ai³⁺

Cd³⁺

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

Drained sewage has B.O.D.

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More than that of water

Less than that of water

Equal to that of water

None of the above

Which element out of the following can exhibit a maximum co valency of seven.

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Chlorine

Fluorine

Sulphur

Both Cl and F

The structure of SO2

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Linear

Angular

V-shaped

Planner

The chrome vanadium steels contain how many percent of vanadium.

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0.15 to 0.30

0.05 to 0.15

0.30 to 0.45

0.45 to 0.60

Which of the following is not a component of HPLC system.

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Pumps

Columns

Particle collector

Injection system.

Brass is an alloy of

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Copper and tin

Copper and zinc

Aluminium and nickel

Leed and tin

Which of the following elements has the highest value of IE.

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Na

K

Mg

Ca

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

The most widely used method of extracting metal ions is the formation of a chelate molecule with an organic chelating agent The chelating agents are.

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Strong acids

Strong bases

Weak bases

Weak acids

Which of the following allows charge transfer through the solution but prevents mixing of the solution.

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Anode

Cathode

Electrode cell

Salt bridge

The process of passing of a precipitate into colloidal solution, on adding an electrolyte is called.

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Dialysis

Peptization

Electrophoresis

Electromsmosis

A molecule the cannot be susperimposed on its mirror image is said to exhibit which of the following.

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Geometrical isomerism

Optical isomerism

Linkage isomerism

Reactive isomerism

Which two atoms of hydrogen combine to form a molecule of hydrogen gas. the energy of the hydrogen molecule is.

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Higher than that of separate H atoms

Equal to that of separate H atoms

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H.

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

Anhydrous AlCl3 cannot be obtained by heating hydrated AlOI3 ,6h2o Because.

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It decomposes completely to give Al2O3

It does not lose water completely

It undergoes hydrolysis to give Al(OH)3

AlCl3 .6H2O is very stable.

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

Which of the following properties are not related to an atom.

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An atom consists of two basic parts , a nucleus and one or more electons.

The nucleus is the central core of an atom

An electron is a heavy and negatively charged particle.

The nucleus itself consiste of two particles.

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