chemical reactions and equations

AB+CD->AC+BD

• Chemical combination

• Decomposition

• Displacement reaction

• Double displacement

S+O2->

• SO2

• SO3

• SO

• 2SO

Zinc reaction with acid give which gas?

• O2

• H2

• Zn2

• K2

Carbonate and bicarbonates reacts with acid releases which gas?

• CO

• H2O

• HO2

• CO2

When silver chloride kept under sunlight the colour change is

• Blue

• Brown

• Grey

• White

The composition of hydrogen and oxygen in water is

• 1:2

• 2:1

• 1:3

• 3:1

When lead nitrate and potassium hydrade are mixed the colour of the precipitate is

• Blue

• Green

• Yellow

• Grey

Loss of electron is

• Oxidation

• Reduction

• Redox

• None

Reactions in which energy is absorbed isknown as

• Endothermic

• Exothermic

• Precipitation

• None

Formula of calcium carbonate

• Caco2

• Caco4

• Caco3

• Ca2CO3