Question # 1

The mass of one molecule of water is.

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18 g

18 mg

18 kg

18 amu

What does keep the particles present in the nucleus intact.

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Particles are held together by dipolar force

Particles are held together by wee nuclear force

Particles are held together by strong nuclear force

Particles are held together by electrostatic force

How many electron are there in the valence shell of sodium atom.

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One

Two

Three

Four

According to Rutherford's atomic theory, atom should produce.

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Line spectrum

Continuous spectrum

Both a and b

None of these

Transition elements are

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All gases

All non metals

All Metals

All metalloids

Covalent Bond involves the

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Sharing of electrons

Repulsion of electrons

Acceptance of electrons

Donation of electrons

Which one of the following halongesn has lowest electronetivity

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Iodine

Chlorine

Fluorine

Bromine

Dative covalent bondis also known as

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Covalent bond

Ionic Bond

Metallic Bond

Coordinate covalent bond

When acids react with metal with carbonates and bicarbonates which gas is produced.

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N2

H2

Cl2

CO2

The structure of C atom in diamond is.

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Pentagonal

Triangle

Hexahedral

Tetrahedral

Why has isotopes not been shown int he periodic table.

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Isotopes do not show periodic behavior

Periodic tble cannot accomodate a large number of isotopes of different elements

All the isotops have same atomic number so there is no need to give them separate places

Someof the isotopes are unstble and they give rise to different elements.

When we mvoe form left to right in a period, atomic size.

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Increases

Decreases

First increases then decreased

None of the above

Ionic compund are good conductors electricity in

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Solution

Molten state

Solid state

both a and b

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