Question # 1

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

________________ solids are hard.

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Ionic

Covalent

Coordinate

Nil

105 elements were discovered by the year ________________

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1984

1974

1086

1996

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

The atomic number is represented by ____________

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A

Y

X

Z

Which one of the following is heterogeneous mixture?

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milk

ink

milk of magnesia

sugar solution

Which one is strong electrolyte ?

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NH4OH

NaOH

a & b

Nil

The base of modern periodic table is

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Atomic number (Z)

Mass number (A)

Avogadro's Number

Quantum Number

________________ elements were discovered in year 1800.

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34

35

36

37

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

1 atm = ?

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1 pascal

760 mm of Hg

1 atm

1 Nm^-2

Reduction means

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Removal of H2

Removal of electrons

Gain of electrons

Gain of O2

The atomic radil of the elements in periodic table:

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increase form left to right in period

increase form top to bottom

do not change form left to right in period

decrease form top to bottom in a group

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