Question # 1

Which branch of chemistry deals with elements and compounds is earth's crust.

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Polymer chemistry

Organic chemistry

Geochemistry

Physical chemistry

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

Attaining two electrons in the valence shell is called.

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Octet rule

Duplet rule

Triplet rule

All of these

Lanthanide series starts after the elemetn

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Osmium

Actinium

Lanthanum

None of these

Elements o group 13 to 18 have thier valence electrons is subshell

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s

p

f

d

Graphite is ..........conductor of electiricity

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Bad

Moderate

Good

None of these

Octet rule is

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Attainign of eight electrons in its valence shell

Discription of eight electrons

Pictur eof electronic configuration

Pattern of electronic configuration

Which is deal with compositon, structure, properties, behavior and changes of matter and energy.

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Technology

Chemistry

Engineering

Science

All bases turn red litmus.

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Blue

White

Pink

Colourless

Metals lose their elecrons easily because.

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They are elecrnegativity

They have electron affinity

They are electropositive

Good conductors of heat

Which is used to manufacture soap?

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NH4OH

Ca(OH)2

NaOH

Mg(OH)2

Mass of 3 moles of oxygen atoms is.

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64 g

16 g

32 g

48 g

The distance between the neclei of two carbon atoms in its elemetnal from is

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150 pm

152 pm

154 pm

156 pm

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