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

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

The lowest energy level is

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K

L

M

N

The cathode of Nelson's cell is made up of

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C

Zn

Cu

Fe

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

________________ solids are hard.

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Ionic

Covalent

Coordinate

Nil

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

H° - H° has ________________ energy.

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Lower

Higher

Medium

Nil

Which one is not a tetraatomic molecular?

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H2O

H2O2

SO3

BCL3

The number of electrons in K shell of O is ________________

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9

10

2

1

D-block consists of:

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4th,5th & 6th periods

2nd, 3rd & 4th periods

1st, 2nd, & 3rd periods

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

Atoms reacts with each other because:

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They are attracted to each other

they are short of electrons

they want to attain stability

they want to disperse

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