Question # 1

The equation of relationship between atomic number (Z) and mass number (A) is

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A = Z + N

A = Z - n

A = Z

A =2Z + n

The repetition of a property after a certain interval is:

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Periodicity

Properties

Periodicity of properties

None

Hydrogen is a ____________

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Metal

Non metal

Metalloids

Nil

Smoke in air is the example of solution.

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Gas in Gas

Gas in liquid

liquid in Gas

Solid in Gas

The elements of group 3 to 12 are called

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Normal elements

Transition elements

Radioactive elements

None of these

Electron _____________ energy when thy jump from higher to lower level.

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Absorb

Radiate

Nothing

Nil

L shell can accommodate ________________ electrons.

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2

8

18

32

Which one metal is least reactive?

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K

Fe

Cu

AI

Mass per unit volume is:

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Velocity

Dencity

Pressure

Nil

4^th and 5^th period of the long form of periodic table are called

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short periods

Normal periods

Long periods

Very long periods

Water is a ____________ covalent compound .

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Polar

Non polar

Ionic

Nil

________________ is triangular in shape.

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BCL3

H2O

CO2

NH3

Which one of the following is not amorphous?

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rubber

plastic

glass

glucose

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