Question # 1

Point out the incorrect statement about electron affinity

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It decreases in a period

It decreases in a group

It is measure din kJmol-1

None of these

Lanthanide series starts after the elemetn

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Osmium

Actinium

Lanthanum

None of these

Attaining two electrons in the valence shell is called.

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Octet rule

Duplet rule

Triplet rule

All of these

Unit of atomic size is

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pm

nm

kJmol-1

Both a and b

The colour of anhydrous copper (II)sulphate solid is

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Pink

Black

White

Blue

Elments re classified into four blocks depending upon

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Shell

Atomic mass

Sub -Shell

Atomic Number

The formaton ionic bond between two ions is due to.

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Hydrogen bonding

Metalic force

Electrostatic forces

All of the above

Which area of chemistry imoroves to gauge the behavior of pollutants and develp techniques for polution control?

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analytical chemistry

geochemistry

Organic chemistry

Environmental Chemsitry

The ability of an atom to attract the shared pair of electons towards itself in a molecule is called

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Ionization energy

Electronietativity

Shielding effect

Electron affinity

Dative covalent bondis also known as

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Covalent bond

Ionic Bond

Metallic Bond

Coordinate covalent bond

How many lone pairs are present on nitogenin ammonia molecule.

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One

Two

Three

Four

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

Which gas is not present in atmosphere?

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Nitrogen

Oxygen

Helium

Carbon dioxide

Temporary hardness can be removed by__________.

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Quick lime

Slaked lime

Lime stone

HCl

Chemical formula of amino group is

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NH₃

NH₂

NH₄

COOH

Carbon black is used in the manufacture of.

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Dry cleaning

Shoe polishes.

Fertilizer

None of these

Photosynthesis process produce.

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Carbondioxide

Glucose and oxygen

Carbon di oxide

glucose and carbondoxide

Raw materials used in Solvay's process.

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Brine

Lime stone

Ammonia gas

All

Water molecule had a structure;

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non-polar

polar

ionic

tetrahedral

Which pollutant is responsible for changing weather?

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Air pollutant

Water pollutant

Soil pollutant

All of them

The freezing point of water is:

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10 ^oC

100^oC

0^oC

46^oC

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium.

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Forward

Reverse

Neither forward nor reverse

Equally move in both direction

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1

2

3

None of these

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

When a non-spontaneous redox reaction is carried out by using the electrical current, then the process is called

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Decomposition of the substances

Cracking

Hydrolysis

Electroiysis

The electrode reaction of a voltaic cell can be reversed when

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Concentrations of solutions are changed

Temperature is increased

Electrodes are interchanged

Electric circuit is employed to supply the source of electricity

A material or a collection of materials which is under study is called

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State function

Degree and joule

Degree and ergs

Calorie and joule

More ideal gas at room temperature is.

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CO2

NH3

SO2

N2

the order of the rate of diffusion of gases NH₃, SO₂, CI₂and CO₂is

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NH₃> SO₂>CI₂CO₂

NH₃> CO₂> SO₂> CI₂

CI₂> SO₂> CO₂> NH₃

NH₃> CO₂> CI₂> SO₂

The standard heat of formation is measured at 1 atmosphere and

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0 ^oC

100 ^oC

293 ^oC

25 ^oC

The deviation of a gas from ideal behavior is maximum at.

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-10 ^oC and 5.0 atm

-10^oC and 2 atm

0^oC and 2 atm

100^oC and 2 atm

Fuel cells are mostly used in space air crafts as the source of.

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Power only

Drinking water

Drinking water and power

Fuel and drinking water

Which meal is least reactive

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Li

NaOH

K

Pb

Boron usually exist in nature as

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Borides

Oxborates

Free element

It is a artificial element

Which one of the following is inorganic fertilizer.

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Manure

Urea

Ammonium nitrate

All of these

Which one of the following is an amide

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(NH₂)₂CO

NH₂.CH₃

C₆H₅NH₂

N(CH₃)₃

What is the oxidation state of Xenon in XeOF2

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0

+2

+4

+6

Which enzyme is not involved in fermentation of starch.

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Diastase

Zymase

Urease

Invertase

Which of the following the highest hydration energy

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Li⁺

Na⁺

K⁺

Mg⁺⁺

--------------- element forms an ion with charge 3⁺

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Beryllium

Aluminium

Carbon

Silicon

Which one of following is used in cosmetics

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Talc

Asbestos

Sodium sulphate

Aluminium Sulphate

Which is more basic

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RbOH

NaOH

KOH

Li OH

Zwitter ion is

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Dipolar ion

Amino acid with two amino groups

Amino acid with two carboxylic acid group

A synthetic amino acid