Question # 1

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

The number of periods is:

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6

7

8

9

The valency of nitrogen is

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1

2

3

4

Which one of the following non-metal is lustrous?

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Sulphur

Phosphorus

Iodine

Carbon

Force per unit area is called:

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volume

pressure

weight

density

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

The other name of modern periodic table is ________________ of periodic table.

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Long form

Simplified

Simplest

Nil

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

Metals from a ____________ part of earth on which we live.

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Smaller

Larger

Medium

Nil

Which is used for industrial manufacture of NaCI?

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Daniel cell

Down's cell

Nelson's cell

None of these

Mass per unit volume is:

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Velocity

Dencity

Pressure

Nil

Gold can only be dissolved by:

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Acids

Bases

Aqua Regia

Nil

Sodium - potassium alloy is used in nuclear reactor as a:

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catalyst

coolant

reactant

absorber

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