Question # 1

The no. of periods in modern periodic table are

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7

11

18

23

Diamonds exists in ____________ form.

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Cubic

Linear

Circular

Nil

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

PCL5 is ________________ shaped.

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Bipyromidal

Angular

Triangular

Linear

There are _________ types of bonds.

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1

2

3

4

Mark the incorrect statement about ionization energy:

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it is measured in Kjmol^-1

it is absorption of energy

it decreases in period

it decreases in a group

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

The simplest of these has formula:

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C60

C10

V20

C30

The elements of group 3 to 12 are called

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Normal elements

Transition elements

Radioactive elements

None of these

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

1 torr = ?

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1 mm of Hg

1 atm

760 mm of Hg

1 pascal

The symbol of barium is:

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Ba

Bi

Br

B

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

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