Question # 1

Which of the following statement is not correct about isotopes.

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they have same atomic number

They have same number of protons

They have same physical properties

They have same chemical propeties

Whcih types of bond is present between NH3 and BF3

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Covalend Bond

Ionic Bond

Co ordinate covalent bond

Metallic Bond

The colour of anhydrous cobalt(II) cholride solid

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White

Black

Pink

Blue

Silicon belongs to Grou IVA . It has ....electons in the valence shell

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2

6

3

4

With the increase of atomic numebr , the number of electron in an atom also.

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Decreases

First increases then decreases

Increases

None of the above

Who performed fist experiment to split atom

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Bohr

Newton

Rutherford

Soddy

Which one of the following halongesn has lowest electronetivity

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Iodine

Chlorine

Fluorine

Bromine

If the Delta H value is negative then reaction witll be

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Endotermic

Exothermic

May or may not be exothermic or endothermic

None of these

None polar compounds are insoluble in

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Alcohol

Benzene

Ether

Water

A bond pair is covalent molecules usually has.

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One electron

Two electron

Three electron

Four electron

Which form of carbon is used as a lubricant?

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Coal

Diamond

Charcoal

Graphite

Diamond is...................

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conductor

non -conductor

both a and b

None of these

When an electronegative element combines with electrpositive element, the type of bonding. is.

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Covalent

Polar Covalent

Ionic

Coorinae Covalent

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