Question 1

when sodium react with water , ....................gas evolves.

Accepted Answer

H2

Answer

O2

Answer

N2

Question 2

the oxide which dissolves in water and produces an acid is ........................

Accepted Answer

CO2

Answer

FeO

Answer

MgO

Question 3

The halogen which exists in a liquid state is ...................

Accepted Answer

bromine

Answer

chlorine

Answer

iodine

Question 4

Sodium in a liquid form is used in .......................

Accepted Answer

nuclear reactors

Answer

fridges

Answer

computers

Question 5

ozone layer absorbs .....................

Accepted Answer

UV rays

Answer

IR rays

Answer

x- rays

Question 6

................is used in extinguishing fires .

Accepted Answer

halons

Answer

methyl bromide gas

Answer

nitrogen oxides

Question 7

the volume of hydrogen gas evolving from water electrolysis equals .....................the oxygen volume .

Accepted Answer

double

Answer

equal to

Answer

half

Question 8

water has a \an ..................effect on litmus paper.

Accepted Answer

neutral

Answer

basic

Answer

acidic

Question 9

,..... ............is considered the midway between horse and zebra

Accepted Answer

quagga

Answer

dodo bird

Answer

golden frog

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