Chaacteristics of chemical reaction

What is the colour of rust?

• Brown

• white

• silver

• green

Rusting takes place in which metal

• copper

• silver

• iron

• gold

what are the conditions required for rusting?

• Presence of oil

• Presence of air

• Presence of moisture

• Presence of sunlight

Who is able to absorb all the water vapour from the test tubes?

• Calcium bromide

• oil

• Calcium carbonate

• calcium chloride

rusting takes place faster in

• dry areas

• moist areas

• coastal areas

How many oxygen atoms are there in ozone?

• 1

• 2

• 3

• 4

In galvanisation which metal is used for protecting iron?

• silver

• copper

• zinc

• magnesium

which all metals are more reactive than iron?

• copper

• zinc

• magnesium

• aluminium

What is the name of rust

• magnesium oxide

• iron chloride

• iron oxide

• iron oxygen

Lime water turns milky due to the formation of

• calcium carbonate

• calcium bicarbonate

• magnesium oxide

• calcium oxide