Question # 1

Solids are fixed ____________

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Shape

Velocity

Mass

Atoms

Elements are represented by chemical _________

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Abbreviation

Unit

Symbols

It can be represented

Which one is least reactive non-metal?

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P

C

CI

F

The bond between two atoms will be ionic if the difference between their electronegativities is:

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Less than 1.7

Greater than 1.7

Zero

Less than 1.2

Ionic compound are ________________ in water.

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insoluble

Soluble

Covalent

Solvent

All electrolytes are:

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Conductor

Insulator

Semi conductor

Nil

Sodium has ________________ no. of protons.

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11

12

13

14

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

Non-metals are generally soft, but which one of the following is extremely hard?

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Graphite

Phosphorus

Iodine

Diamond

Which molecule has single covalent bond?

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O₂

N₂

CI₂

CO₂

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

Addition of OXYGEN is called.

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Reduction

Conduction

Oxidation

Nil

Transition temperature of sulphur is ____________

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95.6

95

95.5

96

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