Question # 1

Bucky balls was discovered in ________________

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1965

1975

1985

1995

During the formation of water from hydrogen and oxygen, which of the following does not occur?

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Hydrogen has oxidized

oxygen has reduced

oxygen gains electrons

hydrogen behaves as oxidizing agent

Elements are represented by chemical _________

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Abbreviation

Unit

Symbols

It can be represented

Which one of the following is not amorphous?

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rubber

plastic

glass

glucose

In double covalent bond, every atom provides

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1 electrons

2 electrons

4 electrons

6 electrons

The earth is made up of ___________ % of iron.

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4

5

6

7

Industrial chemistry deals with the manufacturing of compounds:

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in the laboratory

on micro scale

on commercial scale

on economic scale

The core of the earth is mostly made from ____________

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Nickel

Iron

A % B

Copper

Which has metallic bond?

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H

Na

HCI

P

One mole of sodium = ______ .

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24 g

25 g

26 g

23 g

____________ cell is made of two half of cells.

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Zinc cell

Galvanic

Both

All

Concentration of the copper ore is carried out by:

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Calcinations

Roasting

Forth flotation

Distillation

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Citric acid is present in

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Citrus fruits

Sour milk

Rancid butter

Apple

Aromatic compounds are given this name because of;

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smell they have

slippery touch they have

bitter taste they have

sour taste they have

Formula of soda ash is.

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Na₂CO₃

NaHCO₃

Na₂SO₄

Na₃PO₄

Fertilizers are used to make up the deficiency of;

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oxygen and carbon

iron and magnesium

nitrogen and phosphorus

hydrogen and calcium

The color of Iodine is:

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Purple

Black

Red

Pink

The residual oil is heated above 400 c to produce.

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Lubricants

Paraffin wax

Asphalt

All

Which acid is present in our stomach.

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Nitric acid

Hydrochloric acid

Sulphuric acid

All of these

Effects of ozone depletion are following except the one.

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Increases infectious diseases

Increases crops production

Can cause skin cancer

Can cause climatic changes.

Permanent hardness can be removed by using .

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Soda lime

Sodium Zeolite

Quick lime

Lime water

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

The molecules of a gas show more deviation from ideal behaviour at low temperature, because

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Attractive force dominate at low temperature

Kinetic energies are increased

Collisions become less frequent

Densities of the gases increase

When liquid water changes to ice its volume expands. The expansion in volume is.

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5%

9%

10%

18%

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

Which one of the following substances is not sublime material.

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Iodine

Benzoic acid

Ammonium chloride

Potash alum

Which of the following is a polar molecule

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CCl4

HCl

BF3

CO2

Some impurities of MgCl2 are present in NaCl which separation technique can be used to separate the impurities.

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Filtration

Crystallization

Common ion effect

Chromatography

The number of Na, ions which surround each CI^1-ion the NaCI crystal lattice is

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8

12

6

4

The unit of the rate constant is the same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

The number of moles of acid or base required by one dm³of buffer to alter its pH by one unit is called

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Buffer efficiency

Buffer capacity

Buffer action

None

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

Which of the following is a reddish brown gas

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N₂O₃

NO₂

N₂O₃

N₂O₅

Oxide of Alkaline earth metal are

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Acid

Basic

Neutral

Amphoteric

Which of the following is Ortho and Para directing group

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-I

-CHO

-COR

-NH₂

An atom or group of atoms, which confers characteristic properties to organic compounds, are called.

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Isomerism

Metamerism

Ligands

Functional groups

A quality of raw water is improved by

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Reduction

Aeration

Dehydration

Incineration

In aqua regia, the ratio of conc. HCl to Conc. HNO3 is

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1 : 1

2 :1

1:2

3 : 1

The main pollutant of leather tanneries in the waste water is due the salt of.

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Lead

Chromium (VI)

Copper

Chromium (III)

Ethers show the phenomenon of

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Position Isomerism

Functional group isomerism

Metamerism

Chain isomerism

Isopropyl alcohol on oxidation gives

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Acetaldehyde

Acetone

Ether

Propene

What type of reaction occurs between ethene and hydrogen.

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Addition

Substitution

Oxidation

Dehydration

The flavor of octylacetate is

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Orange

Apricot

Banana

Jasmine