Question # 1

Transition elements are:

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all gases

all metals

all non-metals

all metalloids

Modern periodic table can be classified into ________________.

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Elements

s, p, d, f blocks

Periods

ROWS

Which one of the following is an electron deficient molecule?

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HN₃

BF₃

N₂

O₂

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

Which is an acceptor molecule/ion?

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N₂

O₂

H⁺

CH₄

Which one of the following gas diffuses faster?

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hydrogen

helium

fluorine

chlorine

________________ in linear in shape.

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CO+

CO2

H2O

NH3

It is heterogeneous mixture

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Sand

Milk

Air

Brass

Transition temperature of sulphur is ____________

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95.6

95

95.5

96

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

________________ cannot be seen by naked eye.

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Matter

Molecules

Solid

Liquids

An atom having six electrons in its achieve noble electronic configuration by:

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gaining one electron

losing all electrons

gaining two electrons

losing two electrons

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