Click the correct answer (True or False).
Click the correct answer.
Water dissociates into two components on passing electricity through it. Which of the following are those two components?
Hydrogen, carbon
Hydrogen, oxygen
Hydrogen, sulphur
Hydrogen, nitrogen
Which of the following is used as a catalyst in the decomposition of potassium chlorate (KClO3)?
Potassium chloride
Oxygen
Sulphur dioxide
Manganese dioxide
Which of the following burns in air to form carbon dioxide and water?
Fluorine
Sodium
Methane
Nitrogen
Which of the following combines with water to form carbonic acid?
Carbon dioxide
Carbon
Hydrogen chloride
Potassium
Which of the following on heating decomposes to give calcium oxide and carbon dioxide?
Sodium chloride
Calcium chloride
Carbon chloride
Calcium carbonate
Click the correct answer.
are the substances that combine or react in a reaction.
Reactants
Products
Substances
Chemicals
Calcium carbonate gives calcium oxide and
on heating.
calcium carbonate
carbon
oxygen
carbon dioxide
Reactants that take place in the presence of light are called
reactions.
synthesis
photochemical
combination
displacement
Combination reactions are also called
reactions.
decomposition
synthetic
synthesis
displacement
When iron is heated with sulphur,
is formed.
iron sulphide
sulphate
sulphide
iron sulphate
