Rusting of iron is an example of
deliquescence
decomposition
displacement reaction
redox reaction
reversible reaction
Correct answer is D
No explanation has been provided for this answer.
Two metallic ions commonly present in hard water are
Ca2+ and Zn2+
Cu2+ and Na+
Mg2+ and Ca2+
Fe2+ and Na+
Zn2+ and Cu2+
Correct answer is C
No explanation has been provided for this answer.
The spontaneity of a chemical reaction is determined by the change in the
concentration of the reactants
temperature of the system
free energy of the system
pressure applied to the system
volume of the reactants
Correct answer is C
No explanation has been provided for this answer.
Calcium chloride solution
Concentrated hydrochloric acid
Ethanol
Ethanedioc acid
Aqueous ammonia
Correct answer is E
No explanation has been provided for this answer.
Pipe-borne water is usually chlorinated in order to
improve the teste of the water
remove the hardness in the water clear
coagulate sediments in the water
kill harmful bacteria in the water
make the water clear and colourless
Correct answer is D
No explanation has been provided for this answer.