Question # 1

Which group of the periodic table has the tendency to gain electrons.

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Group -1

Group -17

Group-2

Group -18

Which acid is used in he preparation of soaf.

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Oxalic Acid

Citric Acid

Stearic Acid

Tartaric Acid

The colour of anhydrous cobalt(II) cholride solid

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White

Black

Pink

Blue

4th and 5th priod of the long form of periodic table are called.

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Short periods

Normal periods

Very long peiods

Long periods

An element has 5 electrons in M shell. Its tomic number is.

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5

10

15

20

Whcih one of the following in as electron deficient molecule.

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NH3

O2

BF3

N2

Atom is electrically

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Positive particle

Negaitve particle

Neutral particle

None of these

Empricial formula of sand is.

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SiO2

SiO3

SiO4

SiO

The amoutn of energy given out when an electron is added to an eatom is called.

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Electron affinity

Lattice energy

Ionization energy

Electronegativity

Avogadrao was a scientist

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Italian

Greek

Garman

African

Transfer of electron between elements result in.

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Coordinate covalent bonding

Ionic bonding

Metallic bonding

Covallent bonding

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

Which is not an air pollutant?

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CO₂

CO

SO₂

NH₃

Which is Pentahydroxy aldehydes of the following?

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Starch

Glucose

Fructose

Sucrose

Amino acid are linked to each other through.

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Hydrogen link

Ionic link

Gelatin link

Peptide link

Which gas in produced during ripening of bnabanas.

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Methane

Ethene

Acetylene

Carbon dioxide

The removal of Mg⁺² and Ca⁺² Ion which are responsible for the hardness of water is called.

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Temporary hardness

Permanent hardness

Water softening

Hydrogen bonding

What gas is the major constituent of troposphere?

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Nitrogen

Oxygen

Hydrogen

Both a and b

Mg²⁺ and Ca²⁺ ions react with soap to form calcium and magnesium salts of fatty acids called.

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Gelatin

Scum

Paste

None of them

Global warming is because of.

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Absorption of infrared radiation emitted by earth surface.

Absorption of infrared radiation coming from sun.

Absorption of infrared Ultraviolet coming from the sun.

Emission of ultraviolet radiation from the earth's surface.

According to the Lewis concept acid is a substance which can.

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Donate a proton

Donate a pair of electron

Accept a proton

Accept a pair of electron.

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

Which one of the following methods will be used to separate the mixture of NaCl and sand.

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Chromatography

Solvent extraction

Sublimation

Filtration

A chemical change always involve

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Absorption of heat

Evolution of heat

Either absorption or evolution of heat

The liberation of heat and light energy

If an endothermic reaction is allowed to take place very rapidly i the air, the temperature fo the surrounding air.

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Remains constant

Increase

Decrease

Remain unchanged

A glass is full of water and contains 6.02 x 10²³molecules of H2O The mass of water molecules is.

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18 gm

90 g

120 g

180 g

At constant volume of a system remains constant and the heat is absorbed by the system, them amount of heat absorbed is called

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Enthaply change of the system

Internal energy change of the system

Total enthalphy of the system

Total internal energy of the system

In which compound oxidation state of chlorine is +5

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NaCl

HOCl

NaClO3

NaClO2

The Rutherford experiment of using a stream of alpha particles on a piece of gold foil proved that.

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The atom was a solid sphere

The atom had electron

The atom had neutrons

The atom had a great empty space in it

What is the oxidation state of sulphur in SO3^2-

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-4

-2

+2

+4

Which of the following molecule obey octet rule.

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BF3

BCl3

NH2

SF6

Azeotrpic mixture of two liquids boils at a lower temperature than either of them, when

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It is saturated

Is shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

Is is metastable

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0 ^oC

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546 ^oC

200 ^oC

546 K

273 K

Which one of the following is calcareous material

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Marine shells

clay

Shale

Blast furnace slag

Lowest oxidation state of nitrogen is present in.

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NH3

NO2

NO

HNO3

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

In which process, alkyl halide is not produced.

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Reaction of alcohol with halogen acid

Reaction of Grignard reagent with water

Reaction of alcohol with phosphorous pentachloride

Action of alkene on halogen acid

The bond angle between any two SP²Hydridized orbitals is of

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180°

109.5°

120°

107.5°

Isopropyl alcohol on oxidation gives

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Acetaldehyde

Acetone

Ether

Propene

Silver mirror test is given by

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Ethers

Ketones

Acids

Aldehydes

Which halogen will react spontaneously with Au to produce Au3+

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Br2

F2

I2

Cl2

In fluorescent tube, the gas filled is.

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He

Ne

Ar

Xe

Lead monoxide is

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Amphoteric

Neutral

Acidid

Basic

Nelson's cell is used to prepare

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NaOH

Na₂CO₃

Na metal

NaCl