The process of depositing a layer of zinc on iron is called
Galvanization
Vulcanization
Polymerization
Condensation
Dissolving salt in water is a/an:
Endothermic change
Exothermic change
Both A and B
Chemical combination
A chemical change is also called
Reversible change
Physical change
Temporary change
Chemical reaction
Melting of ice is an example of:
Exothermic reaction
Endothermic reaction
Chemical decomposition
___________ is known as blue Vitriol.
Copper sulphate
Ferrous sulphate
Sulphuric acid
Zinc oxide
Chemical changes are
temporary
partial
permanent
none of these
________ protects us from the harmful ultraviolet radiation.
Oxygen
Hydrogen
Fluorine
Ozone
When liquids are heated, they turn into gases. The yellow egg yolk present inside the egg is a liquid but when it is heated, it changes into an omelet which is solid, why?
Sometimes, liquids turn into solids
Omelet does not follow the above rule
Strictly speaking, the rule does not apply to complex mixtures and egg yolk is a complex mixture
The given statement is false
A chemical reaction in which energy is liberated is called:
Photo chemical reaction
Burning of wood is a _________ change.
Physical
Chemical
Reversible
Temporary
