Question # 1

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

A covalent bond formed by two similar stoms is known as.

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Polar Covalent bond

Metallic bond

Double covalent bond

Non-polar covalent bond

Predict which components of the amosphere react in the presence of lightening.

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N2 and H2O

O2 and H2O

N2 and O2

CO2 and O2

Industrialy, ammonia is produced by which process.

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Halogenation

Solvay process

Haber Process

Hydrogenation

Whcih element is presnet in 2nd period.

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Lithium

Beryllium

Boron

All of these

How many electrons can be accommodated at the msot in the third shell of the elements.

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8

12

10

18

Buckyballs also knowns as.

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Fullerenes

Graphite

Both a and b

None of these

The structure of C atom in diamond is.

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Pentagonal

Triangle

Hexahedral

Tetrahedral

At what temperature , rate of ammonia formation and decomposition is the highest.

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200 ^oC

300^oC

400 ^oC

500 ^oC

In the formation of AlF₃, aluminum atom loses........electrons.

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1

4

3

2

Why the gas starts coming out when you open a can of fizzy drink.

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Because gteh solubiliyt of the gas increases

Because the gas is dissolved under pressure hence it comes out when pressur eis decreased

Becaue the gas is insoluble in water

Because the solubility of hte gas decreases at high pressure.

Macroscopic propertues are properties that can be visualized by

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Telescope

The naked eye

Microscope

Electron microscope

When new bonds ae formed, the energy is

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Consume

Remain same

Release

None of these

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